Skocz do pozycji: 1.

Tytuł:

Autonomous transmission control of a 2017 Yamaha Grizzly 700 all-terrain vehicle

Autorzy:

Wheatley, Greg
Popoola, Samuel

Powiązania:

https://bibliotekanauki.pl/articles/2116415.pdf

Data publikacji:

2021

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

ANSYS
Finite Element Analysis
transmission
analiza elementów skończonych
transmisja

Opis:

Investigation on a designed and modified standard automatic transmission for a 2017 Yamaha Grizzly All-Terrain Vehicle was carried out to allow it to be controlled remotely and autonomously while maintaining its ability to be manually operated. The vehicle is a part of a project named AutoWeed. This project aims at developing a vehicle which can be used in the Australian outback to control and eradicate weeds. Preliminary tests were conducted on the vehicle to determine the performance parameters required to replace the movement supplied by the operator. Several devices used to achieve this motion were explored. It was concluded that the Motion Dynamics HB-DJ806 - LALI10010 electromechanical linear actuator be used as a proof of concept device for this application. This device is capable of exerting 200 N at 35 mm/seconds. It has a stroke length of 50 mm and was powered by a 12V DC motor, which drew 3 amps at maximum load. Through testing, it was found that the selected actuator did not have enough stroke length to cycle through the five gears on the ATV. This error was rectified allowing the system to function as intended. To achieve a reliable design, however, the Linak LA14 actuator was purchased as a final design as it was stronger, faster and had feedback capabilities. Before procurement, the new actuator was digitally modelled using SolidWorks 2017 and 3D printed to confirm the mounting position and method. An ANSYS FEA was conducted on all the custom-made components including the actuator bracket and mounting plate to ensure reliability. The bracket model was manufactured using 3D printing from ABS. It was recommended that for reliability, the bracket should be constructed from a stronger material such as aluminium. The results gained from testing proved that the autonomous transmission system implemented was reliable and repeatable. This was justified as the system achieved a 100% success rate when cycling through gears.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2021, 110; 183--198
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Dynamic testing of copper material : numerical approach

Autorzy:

Baranowski, P.
Małachowski, J.
Mazurkiewicz, Ł.
Damaziak, K.

Powiązania:

https://bibliotekanauki.pl/articles/387353.pdf

Data publikacji:

2013

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

miedź
sprężanie
analiza elementów skończonych
SHPB
copper
compression
FE analysis

Opis:

Split Hopkinson pressure bar (SHPB) is one of the most important and recognisable apparatus used for characterizing the dynamic behaviour of various materials. Incident pulse generated one the incident bar usually have a rectangular shape, which is proper for some materials but for others is not. Therefore, several methods of shaping the incident pulse are used for obtaining constant strain rate conditions during tests. Very often pulse shapers made of copper or similar material are implemented due to its softness properties. In this paper such material was investigated using the FE model of SHPB. Its mechanical behaviour was characterised with and without copper disc between the striker and incident bar. Numerical simulations were carried out using explicit LS-DYNA code. Two different methods were used for modelling the copper sample: typical finite Lagrangian elements and meshless Smoothed Particle Hydrodynamics (SPH) method. As a result of two techniques used axial stress-strain characteristics were compared for three different striker’s velocity with an influence of the copper pulse shaper taking into account. Finally, FE and SPH method was compared with taking into consideration: the efficiency, computer memory and power requirements, complexity of methods and time of simulation.

Źródło:

Acta Mechanica et Automatica; 2013, 7, 4; 195-202
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Design, prototype and experimental evaluation of a wheelchair treadmill

Autorzy:

Kurt, M.
Geyik, H.
Mutlu, B.
Tatar, Y.
Nart, E.

Powiązania:

https://bibliotekanauki.pl/articles/386223.pdf

Data publikacji:

2008

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

wózek inwalidzki
projektowanie
analiza elementów skończonych
wheelchair
finite element analysis
design

Opis:

Generally, wheelchair users cannot move easily within buildings since living areas in architectural structures are not suitable for them to maintain or to improve their physical capabilities. Because living area restrictions affect the physical performance of the users outside during the day, the reduced mobility causes several health problems. These problems become more intense by the time. Especially heart and lung related illnesses are common among the wheelchair users since the immobility decreases respiration capacity. The aim of this research is to design and prototype a wheelchair treadmill to help wheelchair users improve their upper extremity system. In this study, CAD was employed for the design of wheelchair treadmill. Then finite element analysis (FEA) was carried out for the parts of the wheelchair treadmill and the prototype was manufactured based on the results. The prototype was tested under the conditions the product was originally intended to function. In the experiments, the speeds of wheelchair and wheelchair treadmill were measured. The distances taken by users were also recorded, and the results were evaluated with respect to road surface conditions.

Źródło:

Acta Mechanica et Automatica; 2008, 2, 3; 71-75
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Strength analysis of experimental crane, using proliftor 250 rope winch as an excitation of a girder

Autorzy:

Haniszewski, T.

Powiązania:

https://bibliotekanauki.pl/articles/374181.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

simulation
crane
dynamics
FE analysis
symulacja
dźwig
dynamika
analiza elementów skończonych

Opis:

The article presents the research carried out on the experimental construction of a crane, where a hoist with an AC motor without a motor control system was used as an excitation signal for the girder. The purpose of the described research is to determine the relationship between the values of the dynamic surplus factor when lifting the load with the loose rope in the initial phase of lifting and the distance of the hoist from the supporting structure. The data was obtained based on the force tests in a steel wire rope and subsequent determination of the values of stresses and deflections accompanying the selected test cases for different positions of the vibration inductor using the FE method.

Źródło:

Transport Problems; 2018, 13, 3; 131-142
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Finite element analysis of disc temperature during braking process

Autorzy:

Grześ, P.

Powiązania:

https://bibliotekanauki.pl/articles/387284.pdf

Data publikacji:

2009

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

hamowanie
rozkład temperatury
analiza elementów skończonych
braking
temperature distribution
finite element analysis

Opis:

The aim of this paper was to investigate the temperature fields of the solid disc brake during short, emergency braking. The standard Galerkin weighted residual algorithm was used to discretize the parabolic heat transfer equation. The finite element simulation for two-dimensional model was performed due to the heat flux ratio constantly distributed in circumferential direction. Two types of disc brake assembly with appropriate boundary and initial conditions were developed. Results of calculations for the temperature expansion in axial and radial directions are presented. The effect of the angular velocity and the contact pressure evolution on temperature rise of disc brake was investigated. It was found that presented finite element technique for two-dimensional model with particular assumption in operation and boundary conditions validates with so far achievements in this field.

Źródło:

Acta Mechanica et Automatica; 2009, 3, 4; 36-42
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Probabilistic study of bone remodeling using finite element analysis

Autorzy:

Werner, C.
Gorla, R. S. R.

Powiązania:

https://bibliotekanauki.pl/articles/265649.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

analiza probabilistyczna
przebudowa kości
analiza elementów skończonych
probabilistic analysis
bone remodeling
finite element analysis

Opis:

The dynamic bone remodeling process is a computationally challenging research area that struggles to understand the actual mechanisms. It has been observed that a mechanical stimulus in the bone greatly affects the remodeling process. A 3D finite element model of a femur is created and a probabilistic analysis is performed on the model. The probabilistic analysis measures the sensitivities of various parameters related to the material properties, geometric properties, and the three load cases defined as Single Leg Stance, Abduction, and Adduction. The sensitivity of each parameter is based on the calculated maximum mechanical stimulus and analyzed at various values of probabilities ranging from 0.001 to 0.999. The analysis showed that the parameters associated with the Single Leg Stance load case had the highest sensitivity with a probability of 0.99 and the angle of the force applied to the joint of the proximal femur had the overall highest sensitivity.

Źródło:

International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 911-921
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Deflection of an eccentric crack under mixed-mode conditions in an SCB specimen

Autorzy:

Malíková, Lucie
Miarka, Petr
Šimonová, Hana
Kucharczyková, Barbara

Powiązania:

https://bibliotekanauki.pl/articles/2065612.pdf

Data publikacji:

2020

Wydawca:

Politechnika Częstochowska

Tematy:

surface cracks
finite element analysis
stress
concrete
pęknięcia powierzchniowe
analiza elementów skończonych
naprężenie
beton

Opis:

Crack propagation under mixed-mode (I + II) conditions has been investigated in a semicircular disc where various levels of mixed-mode can be achieved by means of different geometry configurations. The research has been performed on a novel cementitious material, alkali-activated concrete. Its main advantage is that it is environment-friendly. On the other hand, its fracture mechanical properties, as of yet, have not been described sufficiently. Therefore, a fracture analysis has been performed. The crack deflection under three point bending conditions has been investigated numerically as well as experimentally. The numerical approach is based on a combination of the common finite element analysis and a multi-parameter form of the maximum tangential stress criterion. This generalized method is suitable especially for materials with specific (elasto-plastic, quasi-brittle etc.) fracture behaviour. The over-deterministic method together with the Williams expansion is applied to approximate selected stress tensor components around the crack tip. In this work, the influence of the eccentric crack is also discussed. In the conclusions, several recommendations about using single-parameter/multi-parameter fracture mechanics are stated.

Źródło:

Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2020, 9, 2; 79--87
2299-8535
2544-963X

Pojawia się w:

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Numerical study of ultimate bearing capacity of rectangular footing on layered sand

Autorzy:

Panwar, V.
Dutta, R. K.

Powiązania:

https://bibliotekanauki.pl/articles/952456.pdf

Data publikacji:

2020

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

rectangular footing
finite element analysis
bearing capacity
layered sandstone
analiza elementów skończonych
nośność podłoża

Opis:

Purpose: The purpose of this study is to investigate the ultimate bearing capacity of the rectangular footing resting over layered sand using finite element method. Design/methodology/approach: Finite element analysis was used to investigate the dimensionless ultimate bearing capacity of the rectangular footing resting on a limited thickness of upper dense sand layer overlying limitless thickness of lower loose sand layer. The friction angle of the upper dense sand layer was varied from 41° to 46° whereas for the lower loose sand layer it was varied from 31° to 36°. Findings: The results reveal that the dimensionless ultimate bearing capacity was found to increase up to an H/W ratio of about 1.75 beyond which the increase was marginal. The results further reveal that the dimensionless ultimate bearing capacity was the maximum for the upper dense and lower loose sand friction angles of 46° and 36°, while it was the lowest for the upper dense and lower loose sands corresponding to the friction angle of 41° and 31°. For H/W = 0.5 and 2, the dimensionless bearing capacity decreases with the increase in the L/W ratio from 0.5 to 6 beyond which the dimensionless ultimate bearing capacity remains constant for all combinations of parameters. The results were presented in nondimensional manner and compared with the previous studies available in literature. Research limitations/implications: The analysis is performed using a ABAQUS 2017 software. The limitation of this study is that only finite element analysis is performed without conducting any experiments in the laboratory. Further the study is conducted only for the vertical loading. Practical implications: This proposed numerical study can be used to predict the ultimate bearing capacity of the rectangular footing resting on layered sand. Originality/value: The present study gives idea about the ultimate bearing capacity of rectangular footing when placed on layered sand (dense sand over loose sand) as well as the effect of thickness of top dense sand layer on the ultimate bearing capacity. The findings could be used to calculate the ultimate bearing capacity of the rectangular footing on layered sand.

Źródło:

Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 1; 15-26
1734-8412

Pojawia się w:

Journal of Achievements in Materials and Manufacturing Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Finite Elements Strenght Analysis of a Compressor Consisting of Four Helical Rotors

Autorzy:

Nieoczym, Aleksander
Szklarek, Karol

Powiązania:

https://bibliotekanauki.pl/articles/102611.pdf

Data publikacji:

2018

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

modal analysis
finite elements analysis
rotary-screw
compressor
analiza modalna
analiza elementów skończonych
śruba obrotowa
sprężarka

Opis:

The present article reports the results of tests of a compressor consisting of four helical rotors. Finite element strength analysis of rotors with varied screw thread pitch was performed. The analysis allowed us to determine the stress-strain state of the rotor material and deformation of rotors as an effect of loads generated during operation of the compressor. The analysis also made it possible to calculate the frequencies of the free vibrations of the rotors.

Źródło:

Advances in Science and Technology. Research Journal; 2018, 12, 1; 1-8
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Investigation of the piezoelectric thimble tactile device operating modes

Autorzy:

Bansevicius, R.
Dragasius, E.
Grigas, V.
Jurenas, V.
Mazeika, D.
Zvironas, A.

Powiązania:

https://bibliotekanauki.pl/articles/307079.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

skóra
wymuszenie harmoniczne
analiza elementów skończonych
tactile sensation
skin strain
harmonic excitation
finite element analysis

Opis:

A multifunctional device to transfer graphical or text information for blind or visually impaired is presented. The prototype using tactile perception has been designed where information displayed on the screen of electronic device (mobile phone, PC) is transferred by oscillating needle, touching the fingertip. Having the aim to define optimal parameters of the fingertip excitation by needle, the computational analysis of different excitation modes has been carried out. A 3D solid computational finite element model of the skin segment, comprising four main fingertip skin layers (stratum corneum, epidermis, dermis and hypodermis) was built by using ANSYS Workbench FEA software. Harmonic analysis of its stress–strain state under excitation with different frequency (up to 10000 Hz) and harmonic force (0.01 N), acting outer stratum corneum layer in normal direction at one, two or three points has been performed. The influence of the mode of dynamic loading of skin was evaluated (in terms of the tactile signal level) on the basis of the normal and shear elastic strain in dermis, where mechanoreceptors are placed. It is shown that the tactile perception of information, delivered by three vibrating pins, may be influenced by configuration of excitation points (their number and phase of loading) and the frequency of excitation.

Źródło:

Acta of Bioengineering and Biomechanics; 2014, 16, 3; 135-143
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

The comparison of density-elastic modulus equations for the distal ulna at multiple forearm positions : a finite element study

Autorzy:

Neuert, M. A. C.
Austman, R. L.
Dunning, C. E.

Powiązania:

https://bibliotekanauki.pl/articles/307226.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

finite element analysis
density modulus relationship
biomechanics
ulna
implant
experimental validation
analiza elementów skończonych
biomechanika

Opis:

The accuracy of an empirically derived density-modulus equation for bone depends upon the loading conditions and anatomic site of bone specimens used for experimentation. A recent study used FE modeling to compare the ability of three density-modulus relationships to predict strain during bending in neutral forearm rotation in the distal ulna; however, due to the inhomogeneous nature of these FE models, the performance of each equation is not necessarily consistent throughout forearm rotation. This issue is addressed in the present study, which compares the performance of these equations in pronation and supination. Strain gauge data were collected at six discreet locations of six ulna specimens loaded in bending at 40° of pronation and supination. Three FE models of each specimen were made, one for each density-modulus relation, and the strain output compared to the experimental data. The equation previously shown to be most accurate in predicting ulnar strain in neutral forearm rotation was also most accurate in pronation and supination. These results identify this one equation as the most appropriate for future FE analysis of the ulna (including adaptive remodeling, and further show that isotropic and inhomogeneous FE bone models may provide consistent results in different planes of bending.

Źródło:

Acta of Bioengineering and Biomechanics; 2013, 15, 3; 37-43
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Numerical prediction of the effects of miniature channel shaped scratches on the fracture behaviour of wires for civil engineering applications using finite element analysis

Autorzy:

Adewole, K. K.
Bull, S. J.

Powiązania:

https://bibliotekanauki.pl/articles/231418.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

drut
analiza awarii
analiza elementów skończonych
pękanie
zarysowanie
wire
failure analysis
finite element analysis
fracture analysis
scratch

Opis:

The effects of the miniature channel-shaped scratches not detectable by the present inline electromagnetic defect detection system employed for wires’ surface defect detection on the fracture behaviour of the wires for civil engineering applications were investigated numerically. Finite element analysis revealed that both miniature channel-shaped across-the-thickness and across-the-width scratches change the fracture behaviour of the wires in terms of the fracture initiation locations and fracture process sequence. However, miniature across-the-thickness scratches does not affect the fracture shape of the wire while miniature across-the-width scratches changed the wires’ cup and cone fracture to a fracture shape with a predominantly flat fracture. These results provide an understanding of the fracture behaviour of wires with miniature scratches and serve as an alternative or a complimentary tools to experimental or fractographic failure analysis of wires with miniatures scratches which are difficult to carry out in the laboratory due to the sizes of the scratches.

Źródło:

Archives of Civil Engineering; 2014, 60, 2; 181-194
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Finite element dynamic analysis of non-uniform beams on variable one-parameter foundation subjected to uniformly distributed moving loads

Autorzy:

Abiala, I. O.
Gbadeyan, J. A.

Powiązania:

https://bibliotekanauki.pl/articles/264602.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

finite element
dynamic analysis
non-uniform beams
one-parameter foundation
analiza dynamiczna
analiza elementów skończonych
obciążenie równomierne

Opis:

A general numerical analysis theory capable of describing the behaviour of a non-uniform beam resting on variable one parameter (Winkler) foundation under a uniform partially distributed moving load is developed. The versatile numerical solution technique employed is based on the finite element and Newmark integration methods. The analysis is carried out in order to evaluate the effect of the following parameters (i) the speed of the moving load (ii) the span length of the beam (iii) two types of vibrating configurations of the beam (iv) the load’s length and (v) the elastic foundation modulus, on the dynamic behaviour of the non-uniform beam resting on the variable one-parameter foundation. Numerical examples which showed that the above parameters have significant effects on the dynamic behaviour of the moving load problem are presented.

Źródło:

International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 693-715
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Effect of seepage on change in stress distribution scenario in static and seismic behaviour of earthen dams

Autorzy:

Nandi, N.
Roychowdhury, A.
Dutta, S. C.

Powiązania:

https://bibliotekanauki.pl/articles/266112.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

obciążenie harmoniczne
analiza elementów skończonych
kombinacja kwadratowa
complete quadratic combination method
harmonic load
finite element analysis

Opis:

The present study makes an effort to understand the damage of earthen dams under static and seismic loading condition. To make the investigation more realistic, behaviour of earthen dams considering the occurrence of a phreatic line indicating the submerged zone due to seepage within the dam body is considered. In case of earthen dams, homogeneous or nonhomogeneous, the consideration of the occurrence of a phreatic line or seepage line through the dam body is an important part of the earthen dam design methodology. The impervious material properties in the submerged zone below the phreatic line due to seepage may differ a lot in magnitudes as compared to the value of the same materials lying above this line. Hence, to have the exact stress distribution scenarios within the earthen dam, the different material properties above and below the phreatic line are considered in this present study. The study is first carried out by two-dimensional as well as three-dimensional finite element analysis under static loading condition. The work is further extended to observe the effect of seepage due to the consideration of the phreatic line on dynamic characteristics of earthen dams. Free vibration analysis and seismic analysis based on the Complete Quadratic Combination (CQC) method by considering twodimensional and three-dimensional modeling are carried out to present the frequencies, mode shapes and the stress distribution pattern of the earthen dam.

Źródło:

International Journal of Applied Mechanics and Engineering; 2018, 23, 1; 121-136
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Numerical and Experimental Studies of Material Properties of Special - Purpose Material Twaron T750
Numeryczne i eksperymentalne badania właściwości materiału specjalnego przeznaczenia Twaron 750

Autorzy:

Barnat, W.
Sokołowski, D.
Gieleta, R.
Bogusz, P.

Powiązania:

https://bibliotekanauki.pl/articles/232404.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

dry aramid fabric
mechanical properties
finite element analysis
sucha tkanina aramidowa
właściwości mechaniczne
analiza elementów skończonych

Opis:

The subject of this paper is an attempt to define the fundamental constants of materials for special-purpose material - aramid dry faricTwaronT750. During research on this problem, tensile tests of dry fabric TwaronT750 were made on an Istron 8802 strength testing machine. The test was filmed with a Phantom V12 high-speed camera. A numerical model of the fabric architecture was made using commercial HyperMesh and LS-DYNA software. In the numerical model a whole research area was represented.
Tematem tego artykułu jest próba określenia podstawowych stałych materiałowych dla materiału specjalnego przeznaczenia, którym jest tkania aramidowa Twaron 750. W trakcie prowadzonych badań zostały wykonane próby rozciągania nieprzesyconej tkaniny Twaron 750 na maszynie wytrzymałościowej Instron 8802. Próba została sfilmowana przy użyciu szybkiej kamery PHANTOM V12. Model numeryczny oddający architekturę tkaniny został wykonany przy użyciu komercyjnego oprogramowania LS-DYNA. W modelu została odwzorowana cała przestrzeń badawcza rozciąganej próbki.

Źródło:

Fibres & Textiles in Eastern Europe; 2015, 4 (112); 33-38
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Application of computational mechanics approaches for increasing of tribosystem operational parameters by using Plasma hardening method

Autorzy:

Kopylov, Viacheslav
Kuzin, Oleg
Kuzin, Nickolai

Powiązania:

https://bibliotekanauki.pl/articles/1839857.pdf

Data publikacji:

2021

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

mathematical model
computational mechanics
contact problem
Optimization
model matematyczny
mechanika obliczeniowa
FEniCS
analiza elementów skończonych
optymalizacja

Opis:

On the basis of the mathematical model of the continual description of functionalgradient metal systems, taking into account their structure, a computational computer scheme has been developed that makes it possible to assess the stress-strain state of local volumes of parts taking into account their spatial inhomogeneity. With the use of modern software components of computational mechanics – FEniCS finite element analysis package and its implementation in Python, the optimal structural characteristics of wheelsets of railway locomotive tires after plasma treatment have been established. It is shown that, depending on the value of the load, hardening of products must be carried out to a depth of 4.5 mm; with a further increase in thickness, the parameters of operational strength do not change.

Źródło:

Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 1; 61-70
2299-9965

Pojawia się w:

Journal of Applied Mathematics and Computational Mechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

An integrated study for solving high vibration problem of a deep well turbine pump

Autorzy:

El-Gazzar, Dalia M.

Powiązania:

https://bibliotekanauki.pl/articles/2203638.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN

Tematy:

vibration analysis
finite element analysis
modal analysis
resonance
vertical turbine pump
analiza drgań
analiza elementów skończonych
analiza modalna
rezonans

Opis:

Mechanical vibrations are a common problem encountered in many machines, especially for vertical turbine pumps. These pumps are generally difficult to stiffen or damp, but the effective diagnosis must begin with an understanding of the underlying vibratory sources. In the present work, a deep well vertical turbine pump experienced extremely high vibrations for a long time although it still being new. It hasn't been in operation for over 6 months. The pump system suffers from extremely high vibration levels relative to the rotational speed (1X motor dominant frequency). An efficient strategy was implemented by using well-conceived techniques. The experimental modal analysis confirmed a presence of a natural frequency. Modifications were carried out to overcome resonance. Finite element analysis was done to determine the reed critical frequencies as a powerful tool to identify and mitigate vibration issues. On-site motor balancing was done to remove vibrations due to the residual imbalance. Results revealed decreasing vibration level by about 66% after solving all problems.

Źródło:

Diagnostyka; 2023, 24, 2; art. no. 2023209
1641-6414
2449-5220

Pojawia się w:

Diagnostyka

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Modeling and stress analyses of a normal foot-ankle and a prosthetic foot-ankle complex

Autorzy:

Ozen, M.
Sayman, O.
Havitcioglu, H.

Powiązania:

https://bibliotekanauki.pl/articles/306591.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

3D modeling
finite element analysis
prosthetic foot-ankle complex
modelowanie 3D
proteza
analiza elementów skończonych

Opis:

Total ankle replacement (TAR) is a relatively new concept and is becoming more popular for treatment of ankle arthritis and fractures. Because of the high costs and difficulties of experimental studies, the developments of TAR prostheses are progressing very slowly. For this reason, the medical imaging techniques such as CT, and MR have become more and more useful. The finite element method (FEM) is a widely used technique to estimate the mechanical behaviors of materials and structures in engineering applications. FEM has also been increasingly applied to biomechanical analyses of human bones, tissues and organs, thanks to the development of both the computing capabilities and the medical imaging techniques. 3-D finite element models of the human foot and ankle from reconstruction of MR and CT images have been investigated by some authors. In this study, data of geometries (used in modeling) of a normal and a prosthetic foot and ankle were obtained from a 3D reconstruction of CT images. The segmentation software, MIMICS was used to generate the 3D images of the bony structures, soft tissues and components of prosthesis of normal and prosthetic ankle-foot complex. Except the spaces between the adjacent surface of the phalanges fused, metatarsals, cuneiforms, cuboid, navicular, talus and calcaneus bones, soft tissues and components of prosthesis were independently developed to form foot and ankle complex. SOLIDWORKS program was used to form the boundary surfaces of all model components and then the solid models were obtained from these boundary surfaces. Finite element analyses software, ABAQUS was used to perform the numerical stress analyses of these models for balanced standing position. Plantar pressure and von Mises stress distributions of the normal and prosthetic ankles were compared with each other. There was a peak pressure increase at the 4th metatarsal, first metatarsal and talus bones and a decrease at the intermediate cuneiform and calcaneus bones, in prosthetic ankle-foot complex compared to normal one. The predicted plantar pressures and von Misses stress distributions for a normal foot were consistent with other FE models given in the literature. The present study is aimed to open new approaches for the development of ankle prosthesis.

Źródło:

Acta of Bioengineering and Biomechanics; 2013, 15, 3; 19-27
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Prediction of air permeability and effective thermal conductivity of multifilament polyester yarn by finite element analysis
Przewidywanie przepuszczalności powietrza i efektywnej przewodności cieplnej wielowłókienkowej przędzy poliestrowej za pomocą analizy elementów skończonych

Autorzy:

Siddiqui, Muhammad Owais Raza
Farooq, Salma
Husain, Muhammad Dawood
Faisal, Saira

Powiązania:

https://bibliotekanauki.pl/articles/2202633.pdf

Data publikacji:

2023

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej

Tematy:

sportswear
thermal conductivity
air permeability
finite element analysis
odzież sportowa
przewodzenie ciepła
przepuszczalność powietrza
analiza elementów skończonych

Opis:

The effective thermal conductivity and air permeability of a multifilament polyester yarn used in sports T-shirts was investigated by computer modeling using finite element analysis (COMSOL Multiphysics, ABAQUS/CAE). It has been shown that the number of fibers, the porosity of the yarn and the proportion of fibers in the volume fraction of the yarn have a direct effect on the effective thermal conductivity and air permeability of the multifilament yarn. It was found that with the increase in the number of fibers, the porosity of the yarn decreases linearly, while the volume fraction of the fibers increases, and thus the effective thermal conductivity increases. In addition, air permeability decreases exponentially.
Zbadano efektywne przewodzenie ciepła i przepuszczalność powietrza wielowłókienkowej przędzy poliestrowej stosowanej w koszulce sportowej poprzez modelowanie obliczeniowe z użyciem analizy elementów skończonych (COMSOL Multiphysics, ABAQUS/CAE). Wykazano, że liczba włókien, porowatość przędzy oraz udział objętościowy włókien w przędzy mają bezpośredni wpływ na przewodzenie ciepła i przepuszczalność powietrza przędzy wielowłókienkowej. Wraz ze wzrostem liczby włókien porowatość przędzy maleje liniowo, natomiast zwiększa się udział objętościowy włókien, a tym samym efektywne przewodnictwo cieplne. Ponadto przepuszczalność powietrza maleje wykładniczo.

Źródło:

Polimery; 2023, 68, 1; 6--18
0032-2725

Pojawia się w:

Polimery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

FEA of displacements and stresses of aortic heart valve leaflets during the opening phase

Autorzy:

Bialas, O.
Żmudzki, J.

Powiązania:

https://bibliotekanauki.pl/articles/368153.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

heart valve
aortic valve
leaflet material
FEA
simulation
zastawka serca
zastawka aortalna
analiza elementów skończonych
symulacja komputerowa

Opis:

Purpose: Modelling of biomechanical behaviour of heart valve materials aids improvement of biofunctional feature. The aim of the work was assessment of influence of material thickness of leaflets of artificial aortic valve on displacements and stresses during opening phase using finite element analysis (FEA). Design/methodology/approach: The model of aortic valve was developed on the basis of average anatomical valve shapes and dimensions. Nonlinear dynamic large displacements analysis with assumption of isotropic linear elastic material behaviour was used in simulation (Solidworks). The modulus of elasticity of 5.0 MPa was assumed and Poisson ratio set to 0.45. The rigidly supported leaflets was loaded by pressure increasing in the range 0-55 mmHg in time 0.1 s. Leaflets with material thickness 0.13 and 0.15 and 0.17 mm were analysed. The thickness was simulated with shell finite elements. Findings: The highest stresses were observed in the areas of fixation of the leaflets near the scaffold and were lower than dangerous value of fatigue of polyurethanes. Increasing the thickness of valve leaflet material in the range of 40 micrometres resulted in reduction of the valve outlet by almost 10 percent. Research limitations/implications: The FEA was limited to the isotropic linear-elastic behaviour of the material albeit can be used to assess leaflet deformation during dynamic load. Practical implications: Leaflets design may be start from efficient FEA which helps estimation of material impact on stress and fold formation which can affect local blood flow. Originality/value: Aortic heart valve leaflet material can be initially tested in dynamic conditions during opening phase with using FEA.

Źródło:

Journal of Achievements in Materials and Manufacturing Engineering; 2019, 92, 1-2; 29-35
1734-8412

Pojawia się w:

Journal of Achievements in Materials and Manufacturing Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Comprehensive system for simulation of vibration processes during the titanium alloys machining

Autorzy:

Stupnytskyy, Vadym
Xianning, She
Novitskyi, Yurii
Novitskyi, Yaroslav

Powiązania:

https://bibliotekanauki.pl/articles/27309878.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

titanium alloys
cutting dynamic
simulation
adiabatic shear
finite element analysis
stopy tytanu
dynamika skrawania
symulacja
analiza elementów skończonych

Opis:

Titanium alloys are difficult-to-machine materials due to their complex mechanical and thermophysical properties. An essential factor in ensuring the quality of the machined surface is the analysis and recommendation of vibration processes accompanying cutting. The analytical description of these processes for machining titanium alloys is very complicated due to the complex adiabatic shear phenomena and the specific thermodynamic state of the chip-forming zone. Simulation modeling chip formation rheology in Computer-Aided Forming systems is a practical method for studying these phenomena. However, dynamic research of the cutting process using such techniques is limited because the initial state of the workpiece and tool is a priori assumed to be "rigid", and the damping properties of the fixture and machine elements are not taken into account at all. Therefore, combining the results of analytical modeling of the cutting process dynamics with the results of simulation modeling was the basis for the proposed research methodology. Such symbiosis of different techniques will consider both mechanical and thermodynamic aspects of machining (specific dynamics of cutting forces) and actual conditions of stiffness and damping properties of the “Machine-Fixture-Tool-Workpiece” system.

Źródło:

Archive of Mechanical Engineering; 2023, LXX, 1; 85--105
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Resistance of columns

Autorzy:

Eamon, C.
Alsendi, A.

Powiązania:

https://bibliotekanauki.pl/articles/129235.pdf

Data publikacji:

2017

Wydawca:

PWB MEDIA Zdziebłowski

Tematy:

podpora betonowa
most
analiza elementów skończonych
obciążenie wybuchem
podmuch
concrete column
bridge
finite element analysis
explosive load
blast

Opis:

A large strain, large displacement finite element model that allows element separation and failure is constructed and validated based on existing results of reinforced concrete columns subjected to blast loads. In this approach, concrete is represented with the Johnson-Holmquist-Cook model while a plastic-kinematic relationship describes steel behavior. The model is used to predict the capacity of typical reinforced concrete bridge columns to resist an assumed blast load scenario, where changes in concrete strength, steel reinforcement ratio, and axial force on the column are considered. The effectiveness of a method of column protection is investigated, where existing columns are wrapped with a relatively inexpensive steel fiber reinforced polymer (SFRP) jacket. It was found that the use of SFRP can significantly enhance the resistance of the columns.

Źródło:

Builder; 2017, 21, 12; 66-69
1896-0642

Pojawia się w:

Builder

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Geometrical sensitivity analysis based on design optimization and multiphysics analysis of PM assisted synchronous reluctance motor

Autorzy:

Nagarajan, V. S.
Kamaraj, V.
Sivaramakrishnan, S.

Powiązania:

https://bibliotekanauki.pl/articles/202289.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

PMASR motor
sensitivity analysis
finite element analysis
thermal analysis
stress analysis
silnik PMASR
analiza wrażliwości
analiza elementów skończonych
analiza termiczna
analiza naprężeń

Opis:

Anisotropic rotor configurations influenced by the presence of a large number of geometrical parameters in a permanent magnet assisted synchronous reluctance (PMASR) motor pose design challenges in obtaining a robust geometry satisfying the requirements of reduced torque ripple and high torque density. Therefore, the purpose of this work is to perform detailed geometrical sensitivity analysis of a 36 slot/4 pole permanent magnet assisted synchronous reluctance (PMASR) motor using h-indexing and level sensitivity analysis in order to specify a guideline for designers to prioritize the design variables for optimization. Systematic multi-level design optimization for multiple objectives is implemented by an NSGA-II algorithm aided by the finite element analysis tool, hardware prototyping and experimental validation. The optimized designs also exhibit better structural and thermal characteristics.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 1; 155-163
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Identification of layers distribution in the composite coupon using finite element method and three point bending test

Autorzy:

Mazurkiewicz, Ł.
Małachowski, J.
Damaziak, K.
Baranowski, P.
Gotowicki, P.

Powiązania:

https://bibliotekanauki.pl/articles/387164.pdf

Data publikacji:

2013

Wydawca:

Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej

Tematy:

fibre reinforced composite
FE analysis
hand lay-up technique
experimental validation
kompozyt włóknisty
analiza elementów skończonych
weryfikacja doświadczalna

Opis:

The main objective of the study is to develop experimentally validated FE model and perform numerical analysis of layered composites made by hand lay-up techniques during tension and bending test. The research object is glass - polyester laminate made of four unidirectional layers. In order to validate the numerical models experimental test were performed. Due to the very different stiffness modulus in tension and bending loading the material properties obtained from standard test are not suitable to apply in numerical model. Significantly different behaviour compared to experimental test was obtained for tree point bending where the numerical model becomes too stiff. Simple coupons, relatively easy to manufacture presented in the paper have very low quality. The differences in actual and theoretical bending stiffness (obtained from tension stiffness) exceed 70%. In order to represent the actual structure the layers of the composite were divided by resin layers and also additional resin layer at the top and bottom of the model were defined. Single stage optimization process was used to adjust the material layout. After layer set-up modification very significant improvement can be seen for flexural behaviour.

Źródło:

Acta Mechanica et Automatica; 2013, 7, 3; 160-165
1898-4088
2300-5319

Pojawia się w:

Acta Mechanica et Automatica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

The Influence of Geometrical Parameters in Socket - Pin Connections on the Value of Opening Force
Wpływ parametrów geometrycznych w połączeniach typu gniazdo - trzpień na wartość siły otwierającej

Autorzy:

Sadowski, T.
Golewski, P.

Powiązania:

https://bibliotekanauki.pl/articles/356243.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

socket-pin joints
deformation process
FEA (finite element analysis)
połączenie gniazdo-trzpień
proces deformacji
FEA
analiza elementów skończonych

Opis:

The paper presents an analysis of the influence of a number of technological aspects of both the socket and the pin on the value of the force required for joint disconnection. A number of numerical simulations were made in Abaqus program to examine effects of such parameters as: presence of an interference fit, use of spherical latches, application of different rigidity of the pin by making cuts with variable width and length, use of different angles of inclination of the working part of the connection. Models of different simple joints presented in this work, can also operate in large structures forming panels of aircraft structures. For this purpose one of the analyzed geometry of the connection was applied to create a 3-D panel model of the structural element in CAD - SolidWorks program. All analysed models with different geometries were subjected to simulation of opening process. The corresponding critical forces were estimated for the beginning of the failure process. The detailed discussion of all model parameters was included to specify their influence on the whole disconnection of joints. It should be noted that aerospace structures work under complex loading states and further numerical studies are required to extend the presented results.
W pracy przedstawiono analizę wpływu kilku zagadnień technologii wykonania zarówno gniazda jak i trzpienia na wartość siły potrzebnej do rozłączenia połączenia. Przeprowadzono szereg symulacji numerycznych w programie Abaqus, badając wpływ takich parametrów jak: występowanie wcisku, użycie sferycznych zatrzasków, zastosowanie różnych sztywności w trzpieniu poprzez wykonanie rozcięć o zmiennej szerokości i długości, zastosowanie różnych kątów pochylenia części roboczej gniazda. Prezentowane w pracy modele pojedynczych połączeń mogą także funkcjonować w większych strukturach tworzących panele konstrukcji lotniczych. W tym celu, dla jednego z analizowanych rozwiązań geometrii wykonano model CAD panelu w programie SolidWorks, który następnie poddano symulacji otwierania. Należy jednak zwrócić uwagę, że konstrukcje lotnicze pracują w złożonych stanach naprężeń i tym samym konieczne są dalsze badania numeryczne prezentowanych rozwiązań.

Źródło:

Archives of Metallurgy and Materials; 2015, 60, 4; 2743-2750
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Finite Element Modeling for the Uni-Axial Tensile Behaviour of Metallic Warp-Knitted Fabric
Zastosowanie metody elementów skończonych (FEM) do przewidywania jednoosiowego rozciągania dzianin metalicznych

Autorzy:

Xu, H.-Y.
Jiang, J.-H.
Chen, N.-L.
Lin, F.-B.
Shao, H.-Q.

Powiązania:

https://bibliotekanauki.pl/articles/231781.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

warp-knitted fabric
finite element analysis
tensile behavior
metallic
TexGen
dzianina osnowowa
analiza elementów skończonych
proces rozciągania
dzianina metaliczna

Opis:

The finite element analysis method (FEM), for its advantages of lower time and economic costing in predicting the mechanical properties of fabrics, was applied to warp-knitted fabrics. In this paper, two bar warp-knitted fabric knitted with wires was used as reflecting mesh antennas. Firstly the loop unit of the metallic warp-knitted fabric was simulated in 3-D by TexGen software. Secondly the 3-D loop unit model was inputted into ABAQUS software to form a model of the metallic warp-knitted fabric sheet for uni-axial tension analysis. Thirdly numerical results were obtained after setting the parameters in ABAQUS. Finally numerical results were verified by uni-axial tensile experiments on the metallic warp-knitted fabric. The results showed that the simulation was in good agreement with the experimental tensile process, where the transfer of yarns between loops when in low fabric elongation and in yarn elongation when in high fabric elongation were simulated by FEM of warp-knitted fabric in the tensile process. Also the same trend of tensile force was found in experiment and FEM results. Therefore it can be concluded that FEM can be used to predict the mechanical properties of warp-knitted fabric with a complex structure.
Do przewidywaniu mechanicznych właściwości dzianin metalicznych zastosowano metodę elementów skończonych (FEM). Symulacji 3D dzianin dokonano przy użyciu dwóch rodzajów oprogramowania: TexGen i ABAQU. Wyniki symulacji zweryfikowano eksperymentalnie. Stwierdzono, że symulacja charakteryzowała się zgodnością z eksperymentalnie przeprowadzonym procesem rozciągania. Na podstawie wyników stwierdzono, że metoda elementów skończonych (FEM) może być z powodzeniem wykorzystywana do przewidywania mechanicznych właściwości dzianin o złożonej strukturze.

Źródło:

Fibres & Textiles in Eastern Europe; 2018, 2 (128); 49-54
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:

Experimental and finite element studies on free vibration of skew plates

Autorzy:

Srinivasa, C. V.
Suresh, Y. J.
Prema Kumar, W. P.

Powiązania:

https://bibliotekanauki.pl/articles/955136.pdf

Data publikacji:

2014

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

laminat
analiza elementów skończonych
płyta kompozytowa
częstotliwość drgań
skew plates
antisymmetric laminates
free vibration
experimental method
finite element analysis

Opis:

The present paper deals with the experimental studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were also determined using QUAD8 finite element of MSC/NASTRAN and a comparison was made between the experimental values and the finite element solution. The effects of the skew angle and aspect ratio on the natural frequencies of isotropic skew plates were studied. The effects of the skew angle, aspect ratio, fiber orientation angle and laminate sequence (keeping the number of layers constant) on the natural frequencies of antisymmetric composite laminates were also studied. The experimental values of natural frequencies are in good agreement with the FE solutions. The natural frequencies are found to increase with an increase in the skew angle. The variation of natural frequencies with the aspect ratio is small and negligible both for isotropic and laminated composite skew plates.

Źródło:

International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 365-377
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:

Comparison finite element analysis on duralium strength against multistage artificial aging process

Autorzy:

Tsamroh, D.I.

Powiązania:

https://bibliotekanauki.pl/articles/2175783.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

mechanical properties
duralium
multistage artificial aging
finite element analysis
riveting
właściwości mechaniczne
wieloetapowe sztuczne starzenie
analiza elementów skończonych
nitowanie

Opis:

Purpose: To analyze and estimate the strength of duralium rivets which had been treated by using multistage artificial aging compared with duralium that had not been treated. This processwas necessary to be conducted in riveting process effectively. Duralium has been widely used in aerospace industry, one of duralium usage in aerospace industry is aircraft fittings such as rivet. Riveting is one of method that used for joining airframe structural components. During riveting process, the load transfer causing stress that led to the fatigue. Riveting process also causes deformation on the rivet and sheet metal. Deformation that occurs on the rivet will affect the performance of rivet structure. Thus, duralium rivet was analyzed its total deformation, shear stress, and its equivalent stress Von Misses. Design/methodology/approach: that used in this study was finite element analysis. Geometry of rivet that used in this study was drawn by using Autodesk Inventor Professional 2018. While total deformation, shear stress and equivalent stress Von Mises on duralium rivets were found out by using ANSYS Workbench 18.1. Findings: Comparison result was obtained between duralium rivet with and without treatment of multistage artificial aging. The result shown that total deformation, shear stress and equivalent stress Von Mises which obtained by duralium rivet with multistage artificial aging had the lower value than duralium rivet without multistage artificial aging. Duralium rivet with multistage artificial aging could be used as aircraft fitting which had the higher strength. Research limitations/implications: Direct experiment on duralium rivet had not been done yet, this study only did simulation based on data that obtained form previous research that had been conducted by the researcher. Practical implications: Duralium rivet with multistage artificial aging had lower value on total deformation, shear stress, and equivalent stress Von Misses, thus duralium rivet with multistage aritificial aging had a higher strength. Originality/value: Application of duralium as a rivet with treatment of multistage artificial aging.

Źródło:

Archives of Materials Science and Engineering; 2021, 109, 1; 29--34
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:

Experimental and Numerical Simulation of the Tensile Behaviour of a Biaxial Warp-knitted Composite
Eksperymentalna i numeryczna symulacja rozciągania kompozytów wzmocnionych dwuosiową dzianiną osnowową

Autorzy:

Gao, X.
Yang, X.
Li, D.
Li, Y.

Powiązania:

https://bibliotekanauki.pl/articles/233474.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

biaxial warp-knitted composite
tensile behavior
finite element analysis
dwuosiowy kompozyt z osnową
zachowanie na rozciąganie
analiza elementów skończonych

Opis:

In this paper a composite reinforced with biaxial warp-knitted fabric and epoxy resin was manufactured by applying vacuum assisted resin transfer moldings (VARTM). The quasi-static tensile behaviour was experimentally tested in 0° and 90° directions, respectively. A finite element model of biaxial warp-knitted composites was developed on a meso-scale. The tensile behaviour of the composites was numerical simulated and compared with the experimental results. It showed that there is an approximate agreement between experimental and numerical results. There are maximum errors sum of squares of 14.52% and 33.29%. The finite element model of biaxial warp-knitted composites has higher accuracy, which can be used to study the static and dynamic mechanical properties.
Wykonano kompozyt wzmocniony dwuosiową dzianiną osnowową i żywicą epoksydową z zastosowaniem próżniowego przenoszenia żywicy (VARTM). Quasi-statyczne właściwości rozciągania badano doświadczalnie odpowiednio w kierunkach 0° i 90°. Opracowano model skończonych elementów dwuosiowych kompozytów z dzianinami. Dokonano symulacji numerycznej zachowania kompozytów podczas rozciągania, a następnie porównano wyniki teoretyczne z wynikami eksperymentalnymi. Wykazano, że istnieje przybliżona zgodność między wynikami eksperymentalnymi i liczbowymi. Stwierdzono, że błędy maksymalne błędy kształtują się na poziomie 14,52% i 33,29%. Zaprezentowany model elementów skończonych ma wysoką dokładność i można go wykorzystać do badania statycznych i dynamicznych właściwości mechanicznych kompozytów.

Źródło:

Fibres & Textiles in Eastern Europe; 2018, 6 (132); 71-76
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:

Numerical modelling of thermal phenomena in laser beam and hybrid welding processes using Abaqus FEA
Modelowanie numeryczne zjawisk cieplnych w procesie spawania laserowego i hybrydowego z wykorzystaniem Abaqus FEA

Autorzy:

Piekarska, W.
Kubiak, M.
Saternus, Z.

Powiązania:

https://bibliotekanauki.pl/articles/382721.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

laser beam welding
hybrid welding
temperature field
finite element analysis
spawanie laserowe
spawanie hybrydowe
pole temperatury
analiza elementów skończonych

Opis:

This paper concerns numerical analysis of thermal phenomena accompanying laser beam and laser-arc hybrid welding processes. Temperature field was obtained on the basis of the solution into energy conservation equation with Fourier law using finite element method. ABAQUS/Standard solver was used for calculations. Electric arc and laser beam heat sources were described respectively by “double ellipsoidal” heat source and Gaussian distribution with assumption of linear decrease of heat source power intensity with material penetration deep. Heat source movement along welded plate was obtained using DFLUX subroutine. Thermo-physical parameters dependant on temperature as well as latent heat of fusion were taken into account in FE analysis. The results of calculations include temperature field in rectangular elements butt welded by a single laser beam and hybrid laser-arc technique.
Praca dotyczy analizy numerycznej zjawisk cieplnych towarzyszących procesom spawania wiązką laserową oraz spawania hybrydowego laser-łuk elektryczny. Rozkłady temperatury otrzymano z numerycznego rozwiązania równania zachowania energii z prawem Fouriera metodą elementów skończonych. Do obliczeń wykorzystano moduł obliczeniowy ABAQUS/Standard. Do opisu rozkładu mocy łuku elektrycznego wykorzystano model „podwójnie elipsoidalny”, natomiast rozkład mocy wiązki laserowej opisano modelem gaussowskim z uwzględnieniem liniowego spadku intensywności mocy źródła z głębokością penetracji materiału. Symulację ruchu źródła spawającego uzyskano dzięki zastosowaniu procedury DFLUX. W analizie uwzględniono zmienne z temperaturą własności termofizyczne a także ciepło krzepnięcia w obszarze dwufazowym. Wyniki obliczeń numerycznych obejmują rozkłady temperatury w elementach prostopadłościennych spawanych doczołowo wiązką laserową i techniką hybrydową laser-łuk elektryczny.

Źródło:

Archives of Foundry Engineering; 2011, 11, 2 spec.; 185-190
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:

Modelling aspects of laser cladding of bioactive glass coatings on ultrafine-grained titanium substrates
Analiza numeryczna procesu napawania laserowego powłok szkła bioaktywnego na ultradrobnoziarniste podłoża tytanowe

Autorzy:

Bajda, Szymon
Krzyzanowski, Michal

Powiązania:

https://bibliotekanauki.pl/articles/29520318.pdf

Data publikacji:

2019

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

laser cladding
ultrafine-grained materials
finite element analysis
bioactive glass
napawanie laserowe
materiały drobnoziarniste
analiza elementów skończonych
szkło bioaktywne

Opis:

Titanium alloys, due to their exceptional mechanical properties and biocompatibility, are commonly used to produce medical implants nowadays. However, the presence of such elements as aluminium and vanadium can be harmful to human health. One of the possible solutions could be replacing the titanium alloys with ultrafine-grained commercially pure titanium (cpTi). The yield and also the ultimate strength of cpTi can exceed 1000 MPa. One of the most promising methods in manufacturing medical implants with improved biological fixation is laser cladding in which bioactive glass coatings are imposed on metallic substrates. The aim of this work is development of a 3D numerical model of the above mentioned additive manufacturing process. The obtained model is able to predict the stress-strain and temperature distributions during the processing. A sequentially coupled finite element (FE) model of laser cladding has been developed by applying element birth and death technique to calculate the transient temperature fields used in the stress analysis. The concentrated volumetric heat source from the laser beam moving along the metal surface has been represented by the Gaussian distribution in the radial and exponential decay in the depth direction. The developed FE based numerical model is capable to support the optimal design of such advanced multi-layered structural materials using the laser cladding technique.
Stopy tytanu są obecnie powszechnie stosowane do produkcji implantów medycznych ze względu na wyjątkowe własności mechaniczne i biokompatybilność. Jednakże obecność takich pierwiastków jak aluminium i wanad może być szkodliwa dla zdrowia ludzkiego. Jednym z możliwych rozwiązań tego problemu może być zastąpienie stopów tytanu ultradrobnoziarnistym komercyjnie czystym tytanem (cpTi), którego granica plastyczności i wytrzymałość na rozciąganie cpTi może przekraczać nawet 1000 MPa. Jedną z najbardziej obiecujących metod produkcji implantów medycznych jest napawanie laserowe, w którym powłoki szkła bioaktywnego są nakładane na podłoża metaliczne. Celem pracy było opracowanie modelu numerycznego 3D w/w procesu wytwarzania przyrostowego. Otrzymany model jest w stanie przewidywać rozkłady naprężeń, odkształceń i temperatur występujących w trakcie procesu. Opracowano model sekwencyjny napawania laserowego wykorzystując metodę elementów skończonych (MES) i technikę dezaktywacji i aktywacji elementów skończonych, co pozwoliło obliczyć przejściowe pola temperatury, które wykorzystano następnie do analizy naprężeń. Skoncentrowane objętościowe źródło ciepła wiązki laserowej przemieszczającej się wzdłuż powierzchni metalu było opisane za pomocą rozkładu Gaussa. Opracowany model numeryczny może wspomóc projektowanie i wytwarzanie zaawansowanych wielowarstwowych materiałów z wykorzystaniem techniki napawania laserowego.

Źródło:

Computer Methods in Materials Science; 2019, 19, 3; 138-149
2720-4081
2720-3948

Pojawia się w:

Computer Methods in Materials Science

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:

Numerical analysis of an auxetic anti-tetrachiral sandwich panel subjected to steady-state harmonic base motion

Autorzy:

Michalski, Jakub
Stręk, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/24202005.pdf

Data publikacji:

2022

Wydawca:

Politechnika Poznańska. Instytut Mechaniki Stosowanej

Tematy:

steady state dynamics
auxetic
sandwich panel
base motion
finite element analysis
dynamika stanu ustalonego
auksetyk
płyta warstwowa
analiza elementów skończonych

Opis:

In this paper, the authors show the results of numerical simulations representing the test of an aluminum sandwich panel with an auxetic anti-tetrachiral core on an exciter. Steady-state vibration analyses utilizing modal superposition (linear dynamics) were performed. The bottom of the panel had all the degrees of freedom constrained and excitation in form of base acceleration in the vertical direction was applied. The obtained results were in form of contour plots of selected output variables in the frequency domain. In addition, curves showing the variation of acceleration, velocity and displacement of a selected representative point in frequency were generated. The results were compared with those obtained for the panel with a non-auxetic core, in the form of a standard hexagonal honeycomb. It was found that the auxetic panel is not superior in the whole range of frequencies but a workflow useful in the design of sandwich panels for operating conditions involving vibrations was developed.

Źródło:

Vibrations in Physical Systems; 2022, 33, 3; art. no. 2022323
0860-6897

Pojawia się w:

Vibrations in Physical Systems

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:

Design and application of compliant mini-grippers for handling chemicals
Projektowanie i zastosowanie podatnych minichwytaków do przenoszenia chemikaliów

Autorzy:

Lateș, D.
Noveanu, S.
Vencel, C.

Powiązania:

https://bibliotekanauki.pl/articles/140302.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

compliant mechanism
bellows actuator
compliant mini gripper
finite element analysis
mechanizm podatny
siłownik typu mieszkowego
podatny minichwytak
analiza elementów skończonych

Opis:

In this paper we propose an original configuration of a compliant mini-gripper for handling chemicals. The compliant mini-gripper is 3D modeled and analyzed with finite element method. To use it in a wider range of containers designed for laboratories we made several variants of fasteners. In order to obtain a functional prototype in a scale appropriate to characterize the system, we determined the material properties of the gripper and developed an experimental stand for characterizing the system with mini-gripper. Finally, we compared the movements of the experimental grip, made according to the movement of the bellows type actuator, determined based on, analytical and numerical results.
W artykule zaproponowano oryginalną konfigurację podatnego minichwytaka do przenoszenia próbek chemikaliów. Opracowano trójwymiarowy model chwytaka i zanalizowano go metodą elementów skończonych. Wykonano kilka wariantów uchwytów dostosowanych do różnych rodzajów pojemników używanych w laboratorium. By otrzymać model funkcjonalny w odpowiedniej skali do charakteryzacji systemu wyznaczono właściwości materiałów chwytaka i zbudowano stanowisko doświadczalne do badań systemu z chwytakiem. Na koniec porównano ruchy eksperymentalnego uchwytu, sterowane ruchem siłownika typu mieszkowego, które wyznaczono na podstawie wyników badań eksperymentalnych i numerycznych.

Źródło:

Archive of Mechanical Engineering; 2015, LXII, 2; 205-216
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:

Field synthesis for the optimal treatment planning in Magnetic Fluid Hyperthermia

Autorzy:

Di Barba, P.
Dughiero, F.
Sieni, E.

Powiązania:

https://bibliotekanauki.pl/articles/140612.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

analiza elementów skończonych
przegrzanie cieczy ferromagnetycznej
optymalna reakcja
evolutionary algorithms
finite element analysis
magnatic fluid hyperthermia
optimal synthesis
coupled fields

Opis:

An automated procedure based on evolutionary computation and Finite Element Analysis (FEA) is proposed to synthesize the optimal distribution of nanoparticles (NPs) in multi-site injection for a Magnetic Fluid Hyperthermia (MFH) therapy. Evolution Strategy and Non dominated Sorting Genetic Algorithm (NSGA) are used as optimization procedures coupled with a Finite Element computation tool.

Źródło:

Archives of Electrical Engineering; 2012, 61, 1; 57-67
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:

A sensitivity analysis on the influence of the external constraints on the dynamic behaviour of a low pollutant emissions aircraft combustor-rig
Analiza wpływu więzów zewnętrznych na właściwości dynamiczne zespołu samolotowej komory spalania o niskiej emisji zanieczyszczeń

Autorzy:

Amoroso, F.
Fenza, A. de
Petrone, G.
Pecora, R.

Powiązania:

https://bibliotekanauki.pl/articles/140218.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

probabilistic analysis
dynamic behaviour
combustor rig
constraints effect
finite element analysis (FEA)
analiza probabilistyczna
właściwości dynamiczne
komora spalania
wpływ więzów
analiza elementów skończonych

Opis:

The need to reduce pollutant emissions leads the engineers to design new aeronautic combustors characterized by lean burn at relatively low temperatures. This requirement can easily cause flame instability phenomena and consequent pressure pulsations which may seriously damage combustor’s structure and/or compromise its fatigue life. Hence the need to study the combustor’s structural dynamics and the interaction between elastic, thermal and acoustic phenomena. Finite element method represent a largely used and fairly reliable tool to address these studies; on the other hand, the idealization process may bring to results quite far from the reality whereas too simplifying assumptions are made. Constraints modelling represent a key-issue for all dynamic FE analyses; a wrong simulation of the constraints may indeed compromise entire analyses although running on very accurate and mesh-refined structural models. In this paper, a probabilistic approach to characterize the influence of external constraints on the modal behaviour of an aircraft combustor-rig is presented. The finite element model validation was performed at first by comparing numerical and experimental results for the free-free condition (no constraints). Once the model was validated, the effect of constraints elasticity on natural frequencies was investigated by means of a probabilistic design simulation (PDS); referring to a specific tool developed in the ANSYS®software, a preliminary statistical analysis was at performed via Monte-Carlo Simulation (MCS) method. The results were then correlated with the experimental ones via Response Surface Method (RSM).
Potrzeba redukcji zanieczyszczeń stawia wobec inżynierów wymaganie projektowania samolotowych komór spalania, które charakteryzują się ubogim spalaniem przy relatywnie niskich temperaturach. W tych warunkach mogą łatwo powstawać zjawiska niestabilności płomienia i wynikające stąd pulsacje ciśnienia, które mogą poważnie uszkodzić strukturę komory spalania lub/i zmniejszyć jej trwałość zmęczeniową. Wynika stąd potrzeba studiów nad dynamiką strukturalną komory spalania i interakcjami między zjawiskami termicznymi i akustycznymi. Metoda elementów skończonych jest narzędziem dość niezawodnym i powszechnie stosowanym, odpowiednim do takich studiów. Z drugiej strony, proces idealizacji może prowadzić do wyników, które są bardzo odległe od rzeczywistości, jeżeli w założeniach przyjęto nadmierne uproszczenia. Modelowanie więzów jest sprawą kluczową dla wszystkich analiz dynamicznych metodą elementów skończonych. Błędna symulacja więzów może istotnie zagrozić całej analizie, nawet gdy korzysta się w niej z bardzo dokładnych modeli strukturalnych o udoskonalonej siatce. W artykule zaprezentowano podejście probabilistyczne by scharakteryzować wpływ więzów zewnętrznych na właściwości modalne zespołu samolotowej komory spalania. Najpierw przeprowadzono walidację modelu elementów skończonych drogą porównania wyników doświadczalnych i obliczeniowych w warunkach swobodnych (bez więzów). Gdy potwierdzono prawidłowość modelu, zbadano wpływ sprężystości więzów na częstotliwości drgań własnych stosując metodę probabilistycznego projektowania symulacji (PDS). Korzystając ze specjalnego narzędzia opracowanego w oprogramowaniu ANSYS, wykonano wstępną analizę statystyczną metodą symulacji Monte Carlo (MCS). Jej wyniki skorelowano następnie z wynikami doświadczalnymi stosując metodę powierzchni odpowiedzi (RSM).

Źródło:

Archive of Mechanical Engineering; 2016, LXIII, 3; 435-454
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:

Distribution of forces on supporting teeth in the midpalatal expander during “Hyrax” screw pre-load

Autorzy:

Młynarek, K.
Żmudzki, J.

Powiązania:

https://bibliotekanauki.pl/articles/366987.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

rapid palatal expansion
Hyrax screw pre-load
stress
displacement
finite elements analysis
FEA
szybka ekspansja podniebienia
naprężenie
przemieszczenie
analiza elementów skończonych

Opis:

Purpose: The aim of the study was to determine forces which are transferred to supporting teeth during the treatment with the midpalatal device with Hyrax screw and to evaluate orthodontic and orthopaedic effects based on displacement analysis. Design/methodology/approach: The finite element method (FEM) was used to simulation the midpalatal expansion forces activated by the screw pre-loaded during a turn of 180° which corresponds to daily recommended value. Distribution of expansion forces of Hyrax device was calculated as reaction forces on elastic supports with stiffness corresponding to the teeth working on periodontal ligament in alveolar bone. Findings: On the basis of the displacement analysis was observed the movement of supporting teeth by a value higher than 0.1 mm which corresponds to the recommended daily value. The midpalatal suture splitting forces were determined on the first premolars with a value of 32.8 N and on the first premolars of 44.2 N. Research limitations/implications: The studies did not take into account the shape of palate other craniofacial bones and their stiffness. Practical implications: Adjusting the stiffness of the device to degree of ossification midpalatal suture and teeth mobility. Searching for new solutions which eliminate the negative phenomenon of tilting teeth during the expansion of maxilla and recommending a surgically assisted techniques. Originality/value: The simulation confirmed that treatment with Hyrax screw gives a uniform expansion with values of forces corresponded to stiffness of premolar and molar teeth. The studies have indicated a possibility of tendency to tilting the supporting teeth what is a negative phenomenon.

Źródło:

Journal of Achievements in Materials and Manufacturing Engineering; 2019, 93, 1-2; 26-31
1734-8412

Pojawia się w:

Journal of Achievements in Materials and Manufacturing Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:

Effective algorithm for structural optimization subjected to fatigue damage and random excitation

Autorzy:

Sága, M.
Vaško, M.
Ságová, Z.
Handrik, M.

Powiązania:

https://bibliotekanauki.pl/articles/198388.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

finite element analysis
structural optimization
optimization
algorithm
fatigue damage
multiaxial rainflow counting
analiza elementów skończonych
optymalizacja strukturalna
optymalizacja
algorytm
uszkodzenie zmęczeniowe

Opis:

The aim of the paper is to present the computationally timeconsuming task of simulating the process of randomly oscillating thin-shell structures to realize an optimal design with limitations in terms of fatigue damage. The most important aim here is to design an effective optimization algorithm and choose an appropriate approach for the evaluation of multiaxial fatigue damage in the context of the random and non-proportional character of stress in the structure when considering the standard finite element model. The authors propose their own optimization algorithm, which is described in the present study and, on the basis of tests, has proven to be suitable for the aforementioned technical problems. The proposition of algorithms for calculating the accumulation of fatigue damage in non-proportional and multiaxial stresses (especially in terms of the application of rainflow analysis by decomposition of the equivalent stress, as determined by the appropriate “fatigue” criterion) is very important in such computational processes. The entire computational process was implemented in MATLAB with the “Discret_Opt_Fat” main control program. The article presents the theoretical basis for the presented complex problem solution, its algorithmization and the technical application.

Źródło:

Zeszyty Naukowe. Transport / Politechnika Śląska; 2018, 99; 149-161
0209-3324
2450-1549

Pojawia się w:

Zeszyty Naukowe. Transport / Politechnika Śląska

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:

Numerical investigation of the free vibration of partially clamped rectangular plates

Autorzy:

Gharaibeh, M. A.
Obeidat, A. M.
Obaidat, M. H.

Powiązania:

https://bibliotekanauki.pl/articles/265990.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Zielonogórski. Oficyna Wydawnicza

Tematy:

analiza elementów skończonych
częstotliwości naturalne
płyta elastyczna
elastic plates
plates with partially clamped edges
natural frequencies and mode shapes
finite element analysis

Opis:

This paper studies the free vibration characteristics of rectangular plates with partially clamped edges around the corners using the finite element method. ANSYS Parametric Design Language (APDL) was utilized to produce the finite element (FE) models and to run the analysis. The FE models were used to obtain the plate first natural frequency and mode shape. A comprehensive investigation of the effect of the plate geometric parameters and different boundary condition properties on the natural frequency and mode shapes is presented. The results showed that the vibration characteristics of the structure are greatly dependent on the plate size and the constraint properties.

Źródło:

International Journal of Applied Mechanics and Engineering; 2018, 23, 2; 385-400
1734-4492
2353-9003

Pojawia się w:

International Journal of Applied Mechanics and Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:

Effect of infill and density pattern on the mechanical behaviour of ABS parts manufactured by FDM using Taguchi and ANOVA approach

Autorzy:

Othmani, M.
Zarbane, K.
Chouaf, A.

Powiązania:

https://bibliotekanauki.pl/articles/2175753.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

fused deposition modelling
infill pattern
infill density
finite element analysis
Taguchi
modelowanie metodą osadzania topionego
wzór wypełnienia
gęstość wypełnienia
analiza elementów skończonych

Opis:

Purpose: The present work aims to investigate the effect of many infill patterns (rectilinear, line, grid, triangles, cubic, concentric, honeycomb, 3D honeycomb) and the infill density on the mechanical tensile strength of an Acrylonitrile Butadiene Styrene (ABS) test specimen manufactured numerically by FDM. Design/methodology/approach: Computer-Aided Design (CAD) software has been used to model the geometry and the mesostructure of the test specimens in a fully automatic manner from a G-code file by using a script. Then, a Numerical Design of Experiments (NDoE) has been carried out by using Taguchi method and the Analysis of Variance (ANOVA). The tensile behaviour of these numerical test specimens has been studied by the Finite Element Analysis (FEA). Findings: The FEA results showed that a maximal Ultimate Tensile Strength (UTS) was reached by using the ‘concentric’ infill pattern combined with an infill density of 30%. The results also show that the infill pattern and the infill density are significant factors. Research limitations/implications: The low infill densities of 20% and 30% that have already been used in many previous studies, we have also applied it in order to reduce the time of the simulations. Indeed, with high infill density, the simulations take a very excessive time. In an ongoing study, we predicted higher percentages. Practical implications: This study provided an important modelling tool for the design and manufacture of functional parts and helps the FDM practitioners and engineers to manufacture strong and lightweight FDM parts by choosing the optimal process parameters. Originality/value: This study elucidated the effect of various infill patterns on the tensile properties of the test specimens and applied for the first time a NDoE using numerical test specimens created by the mesostructured approach, which considerably minimized the cost of the experiments while obtaining an error of 6.8% between the numerical and the experimental values of the UTS.

Źródło:

Archives of Materials Science and Engineering; 2021, 111, 2; 66--77
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Study of ancient forging devices: 3D modelling and analysis using current computer methods

Autorzy:

Rojas-Sola, J. I.
Bouza-Rodríguez, J. B.
Comesaña-Campos, A.

Powiązania:

https://bibliotekanauki.pl/articles/200411.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

forging device
hydraulic trompe
3D modelling
computational fluid dynamics
finite element analysis
urządzenie do kucia
modelowanie 3D
analiza elementów skończonych

Opis:

An ancient forging device in Spain has been studied, namely the forge with a waterwheel and air-blowing tube or hydraulic trompe, found near the village of Santa Eulalia de Oscos (province of Asturias, Spain). Three procedures using ad hoc methods were applied: 3D modelling, finite element analysis (FEA), and computational-fluid dynamics (CFD). The CFD results indicated the proper functioning of the trompe, which is a peculiar device based on the Venturi effect to take in air. The maximum air volume flow rate supplied to the forge by the trompe was shown to be 0.091 m3/s, and certain parameters of relevance in the trompe design presented optimal values, i.e. offering maximum air-flow supply. Furthermore, the distribution of stress over the motion-transmission system revealed that the stress was concentrated most intensely in the cogs of the transmission shaft (a kind of camshaft), registering values of up to 7.50 MPa, although this value remained below half of the maximum admissible work stress. Therefore, it was confirmed that the oak wood from which the motion system and the trompe were made functioned properly, as these systems never exceeded the maximum admissible working stress, demonstrating the effectiveness of the materials used in that period.

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 377-390
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Numerical simulation and experimental validation of solar greenhouse dryer using finite element analysis for different roof shapes

Autorzy:

Yadav, Aditya Arvind
Prabhu, Pravin A.
Bagi, Jaydeep S.

Powiązania:

https://bibliotekanauki.pl/articles/1819128.pdf

Data publikacji:

2021

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

solar greenhouse dryer
drying
moisture removal
solar thermal energy
finite element analysis
szklarnia
suszarnia słoneczna
suszenie
usuwanie wilgoci
energia słoneczna
analiza elementów skończonych

Opis:

The present study focuses on the numerical simulation and experimental validation of a Solar Greenhouse Dryer (SGHD). The Solar Dryers are the devices which uses solar energy to dry substances, especially crops with high moisture content, and the word Greenhouse means protection of crops from excess hot or cold climatic conditions and unwanted pests. Thus, Solar Greenhouse Dryer is a device which utilizes solar energy for drying of crops with high moisture content and prevents it from excess climatic conditions and provides optimum range of temperature and prevents the dried product from pests and dust while drying. The numerical simulation of SGHD was performed using Finite Element Analysis software ANSYS 2020 R2. Initially three different roof shapes were modelled using software CATIA V5 R3 namely triangular, trapezoidal and dome shape. The modelled SGHDs was then introduced to ANSYS domain for numerical analysis. The models were initially meshed in ANSYS workbench with unstructured tetrahedral structure of mesh over all the domains. The Solar Ray tracing content was used for numerical simulation of dryers, the solar ray tracing is used to predict direct illumination energy source produced by sun at experimental site. The experiment for no-load test was conducted at Bahe Borgaon, Dist- Sangli, Maharashtra, India at 17.115°N and 74.33°E.

Źródło:

Journal of Mechanical and Energy Engineering; 2021, 5, 1; 69--80
2544-0780
2544-1671

Pojawia się w:

Journal of Mechanical and Energy Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Design and analysis of cementless hip-joint system using functionally graded material

Autorzy:

Asiri, Saeed

Powiązania:

https://bibliotekanauki.pl/articles/2065758.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

functionally graded material
cementless hip-joint system
natural frequency
harmonic response
fatigue analysis
finite element analysis
modal analysis
odpowiedź harmoniczna
analiza zmęczeniowa
analiza elementów skończonych
analiza modalna

Opis:

Functionally Graded Materials (FGM) are extensively employed for hip plant component material due to their certain properties in a specific design to achieve the requirements of the hip-joint system. Nevertheless, if there are similar properties, it doesn’t necessarily indicate that the knee plant is efficiently and effectively working. Therefore, it is important to develop an ideal design of functionally graded material femoral components that can be used for a long period. A new ideal design of femoral prosthesis can be introduced using functionally graded fiber polymer (FGFP) which will reduce the stress shielding and the corresponding stresses present over the interface. Herein, modal analysis of the complete hip plant part is carried out, which is the main factor and to date, very few research studies have been found on it. Moreover, this enhances the life of hip replacement, and the modal, harmonic, and fatigue analysis determines the pre-loading failure phenomena due to the vibrational response of the hip. This study deals with the cementless hip plant applying the finite element analysis (FEA) model in which geometry is studied, and the femoral bone model is based in a 3D scan.

Źródło:

Archive of Mechanical Engineering; 2022, LXIX, 1; 129--146
0004-0738

Pojawia się w:

Archive of Mechanical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Finite element analysis of the impact of the properties of dental wedge materials on functional features

Autorzy:

Czerwiński, M.
Żmudzki, J.
Kwieciński, K.
Kowalczyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/2175745.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach

Tematy:

dental wedge material
friction
matrix
filling
seal
finite element analysis (FEA)
pressure
materiał klina dentystycznego
tarcie
matryca
wypełnienie
uszczelnienie
analiza elementów skończonych
ciśnienie

Opis:

Purpose: Defect of the interproximal wall of the tooth is filled with use the shaped matrix and wedge which seals bottom margin during filling. Better fit of the wedge and equalization of the pressure forces on the matrix is achieved by the compliance of the wedge structure through cuts and perforations and the use of silicone materials and unidirectionally expanded polytetrafluoroethylene (ePTFE). The work presents a methodology for model studies of the mechanics of dental wedges in order to evaluate and compare the impact of wedge materials on functional features. The hypothesis of the work was that the mechanical properties of ePTFE determine the effectiveness of the dental wedge. Design/methodology/approach: Effect of modulus of elasticity and friction coefficient of wedge and matrix materials on the functional features of the wedge was studied on the way Finite Element Analysis (FEA). Simulation included contact sliding between wedge and matrix what was simulated in nonlinear large displacements regime. The sealing evaluation criterion was the pressure distribution between the wedge and matrix below the lower edge of the defect. Displacement values were the criterion for the loss of convexity as a result of matrix deformation. Findings: The material for the wedge should be characterized by a low coefficient of friction, low elasticity (ensuring high compliance of the wedge) and at the same time the ability to large permanent deformations, which allows for plastic shaping of the matrix from the side of the defect in order to achieve the required wall convexity and the tangent point. Research limitations/implications: Results show tendency of phenomena in limitation to model simplification of the interdental gap and the ideal adhesion of the matrix to the tooth and linear elasticity of materials. Practical implications: The material that best meets the requirements is unidirectionally expanded polytetrafluoroethylene, which has one of the lowest coefficients of friction and very high plasticity necessary to shape the matrix from the inside of the cavity. Originality/value: Methodology of model study and criteria of functional characteristics of dental wedge was presented.

Źródło:

Archives of Materials Science and Engineering; 2021, 112, 1; 32--41
1897-2764

Pojawia się w:

Archives of Materials Science and Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Some guidance in the designing of a roller for the automotive testers

Autorzy:

Angelov, Y.
Draganov, I.

Powiązania:

https://bibliotekanauki.pl/articles/375491.pdf

Data publikacji:

2018

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

automotive brake tester
roller
optimisation
PSI-method
finite element analysis
R1MS
motoryzacyjny próbnik hamowania
wałek
optymalizacja
metoda PSI
analiza elementów skończonych

Opis:

This work presents some aspects related to the designing of a roller for stands that are intended to determine the parameters of the transmission of a vehicle, such as braking force, wheel revolutions, etc. The computational scheme of simply supported beam is used to create an analytical mechanical-mathematical model through which a multicriteria optimization problem has been solved. A finite element macro and submodel of the roller has been created, and by using the R1MS technique, the fatigue strength in the welding seams in the roller has also been determined. A parametric analysis is accomplished to determine the influence of the thickness of the base steel and the covering ebonite layer on the perimeter change of the outer surface, taking into account the physical non-linearity of the outer layer.

Źródło:

Transport Problems; 2018, 13, 3; 97-108
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Increasing the resource of milling cutters used to process the locomotive wheelsets. Part 2: Study of stressed-deformed state

Autorzy:

Sładkowski, Aleksander
Proydak, Yuriy
Ruban, Vladislav

Powiązania:

https://bibliotekanauki.pl/articles/1841204.pdf

Data publikacji:

2020

Wydawca:

Politechnika Śląska. Wydawnictwo Politechniki Śląskiej

Tematy:

locomotive wheelsets
milling machine
finite element analysis
cylindrical cutting tools
milling cutter
zestaw kołowy lokomotywy
frezarka
analiza elementów skończonych
cylindryczne narzędzie skrawające
frez

Opis:

The article deals with the stress-strain state of the cutters used in the mills of a new design for the restoration of the working surfaces of locomotive wheels. A comparative analysis of stresses in the cutters was carried out using the finite element method, which showed a significant advantage of the new technical solution, the novelty of which is confirmed by the patent.

Źródło:

Transport Problems; 2020, 15, 3; 139-151
1896-0596
2300-861X

Pojawia się w:

Transport Problems

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Finite element modeling of composite concrete-steel columns
Numeryczne modelowanie zespolonych słupów stalowo-betonowych

Autorzy:

Kwaśniewski, L.
Szmigiera, E.
Siennicki, M.

Powiązania:

https://bibliotekanauki.pl/articles/230728.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

kolumna stalowo-betonowa
kolumna kompozytowa
modelowanie numeryczne
analiza elementów skończonych
imperfekcja
interakcja
concrete-steel column
composite column
numerical modelling
finite element analysis
imperfection
interaction

Opis:

This paper presents the numerical part of the research program on concrete-filled steel columns. Nonlinear, three dimensional FE analysis of axial compression, was conducted using the finite element program ABAQUS. The numerical results were validated through comparison with experimental data in terms of ultimate loading and deformation modes. Modeling related problems such as the definition of boundary conditions, imperfections, concrete-steel interaction, material representation and others are investigated using a comprehensive parametric study. The developed FE models will be used for an enhanced interpretation of experiments and for the predictive study of cases not included in the experimental testing.
W artykule przedstawiono numeryczną część programu badań słupów stalowych wypełnionych betonem. Przeprowadzono nieliniową, trójwymiarową analizę FE ściskania osiowego, za pomocą programu ABAQUS. Numeryczne wyniki zostały zwalidowane przez porównanie z danymi doświadczalnymi w zakresie obciążenia granicznego i typu odkształcenia. Za pomocą kompleksowych studiów parametrycznych badano zagadnienia związane z modelowaniem takich parametrów jak określenie warunków brzegowych, imperfekcji, interakcji miedzy betonem a stalą, odwzorowaniem materiałów. Opracowane modele FE zostaną wykorzystane do udoskonalenia interpretacji eksperymentów i przewidywania wyników dla przypadków niebadanych doświadczalnie.

Źródło:

Archives of Civil Engineering; 2011, 57, 4; 373-388
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Analysis of the structural response of Beirut port concrete silos under blast loading

Autorzy:

Ismail, Sahar Ali
Raphael, Wassim
Durand, Emmanuel
Kaddah, Fouad
Geara, Fadi

Powiązania:

https://bibliotekanauki.pl/articles/1852380.pdf

Data publikacji:

2021

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

obciążenie wybuchem
uszkodzenie
analiza elementów skończonych
interakcja grunt-konstrukcja-fundament
silos betonowy
blast loading
failure
finite element analysis
soil-structure-foundation interaction
concrete silo

Opis:

Several months after August 4, 2020, Lebanon is still recovering from the enormous explosion at the port of Beirut that killed more than 200 people and injured more than 7500. This explosion ripped the city to shreds and significantly damaged the Beirut port silos. Saint Joseph University of Beirut “the school of engineering ESIB” in collaboration with “Amann” Engineering performed a 3D scan of the Beirut port silos to assess the silos’ level of damage. The obtained data was then compared to the numerical modelling results, obtained from Abaqus explicit, in order to estimate the blast magnitude and to check if the pile foundation can be reused in building new silos at the same place due to the limited space available at the port of Beirut while considering the soil-foundation-structure interaction effect. In addition, the silos’ structural response against the filling of the silos at the time of explosion was investigated. The displacement of the silos and the amount of silos’ damage obtained from the fixed and flexible numerical models indicate that a blast magnitude of 0.44 kt TNT (approximately 1100 tons of Ammonium Nitrate) best estimates the 20 to 30 cm silos’ tilting in the direction of the blast. In addition, the soil and the foundation played a positive role by absorbing part while dissipating less amount of the blast energy. Also, the grains at the time of the event did not affect the silos’ deformation and damage amount. Noting that the displacement of the pile foundation exceeded all limits set by design codes, indicating that the pile foundation cannot be reused to build new silos at the same place.

Źródło:

Archives of Civil Engineering; 2021, 67, 3; 619-638
1230-2945

Pojawia się w:

Archives of Civil Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Selected problems of design and pre-implementation studies of new types of manipulators

Autorzy:

Cegielski, Paweł
Golański, Dariusz
Kołodziejczak, Paweł
Kolasa, Andrzej
Silbert, Bogusław
Krykavskyy, Yevhen

Powiązania:

https://bibliotekanauki.pl/articles/1819227.pdf

Data publikacji:

2021

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

pozycjoner
manipulator
bieżnia
oś robota zewnętrzna
analiza elementów skończonych
programowanie off-line
positioner
running track
external robot axis
finite element analysis
off-line programming

Opis:

Conceptual development and testing of models and prototypes of manipulators, supporting the work of industrial robots, has become a specialty of the Department of Welding Engineering of the Warsaw University of Technology and ZAP Robotyka from Ostrow Wielkopolski. However, they are not typical devices, so their development requires a detailed analysis of many aspects, both functional and economic. Also the pre-implementation tests are not included in dedicated standards and must be based on previously developed experimental procedures. This article presents selected problems in the design and research of new types of manipulators, created as a result of joint research and development work.

Źródło:

Welding Technology Review; 2021, 93, 3; 15--29
0033-2364
2449-7959

Pojawia się w:

Welding Technology Review

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Gravitational water vortex: Finite element analysis based design and implementation

Autorzy:

Vinayakumar, B.
Rahul, Antony
Binson, V.A.
Youhan, Sunny

Powiązania:

https://bibliotekanauki.pl/articles/2202881.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

gravitation water vortex
renewable energy
green energy
finite element analysis
FEA
modelling
grawitacyjny wir wodny
energia odnawialna
zielona energia
analiza elementów skończonych
MES
modelowanie

Opis:

The following work gives the details of the modelling, simulation, and testing of a small portable gravitational water vortex (GWV) based power plant. The gravitation water vortex is an ideal source of renewable energy for rural areas that have a small body of flowing water. For this purpose, we have selected a small size for the vortex chamber that enables it to form a vortex with limited amounts of water. The paper gives the details of the simulation of the GWV in COMSOL FEA software and the parameters that were chosen for optimization. These parameters were the height of the vortex chamber, the number of blades, the length of the blades, and the tilt angle of the blades. These parameters were systematically varied step by step, to observe their effect on the speed of the rotor. The results of the parametric sweep that was performed on all the parameters are also presented. Based on the simulation results an optimal set of parameters was chosen for the physical implementation of the GWV. The paper also goes into the details of the construction of the physical GWV, the experimental setup that was devised for the testing and verification of the simulation results.

Źródło:

Chemical and Process Engineering; 2022, 43, 3; 357--368
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 50.

Tytuł:

Finite element analysis of mini-plate stabilization of human mandible angle fracture – a comparative study

Autorzy:

Wądołowski, Piotr
Krzesiński, Grzegorz
Gutowski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/27324127.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

finite element analysis
maxillofacial surgery
mandibular angle fracture
miniplate osteosynthesis
contact mechanics
analiza elementów skończonych
chirurgia szczękowo-twarzowa
złamanie kąta żuchwy
osteosynteza minipłytkowa
mechanika kontaktowa

Opis:

Purpose: The purpose of this study was to analyze three patterns of mandible angle fracture treatment by means of the finite element analysis. Methods: Investigation has been based on the mandible geometry reconstructed with use of hospitalized patient CT data. The KLS Martin mini-plates with corresponding screws were used to establish proper fracture stabilization. Models were run assuming isotropic and elasto-plastic material properties of connecting devices and cortical bone. The main masticatory muscles and artificial temporomandibular joint have been incorporated to assure mandible physiological movement. The gage loading has been applied in three different locations to cover wider range of possible mastication loading cases during daily routine. A different contact conditions have been applied to the fracture plane to simulate both load bearing and sharing behaviors. Prepared FEM models reflect the most frequently used surgery’s approaches to mandible angle fracture treatment. A specific nomenclature has been introduced to describe particular model. The tension plate, with one connecting mini-plate, two-point fixation and combined fixation, both using two mini-plates respectively. Results: Performed analysis allowed for a detailed estimation of the mini-plate connection response under the applied gauge loading. The equivalent stress within the mini-plates and surrounding cortical bone have been compared between all models. Regarding the fracture plane, the contact status and pressure have been considered. Conclusions: The combined fixation model, acting as a biplanar fastener system, presents the highest flexibility and connection efficiency.

Źródło:

Acta of Bioengineering and Biomechanics; 2020, 22, 3; 105--116
1509-409X
2450-6303

Pojawia się w:

Acta of Bioengineering and Biomechanics

Dostawca treści:

Biblioteka Nauki

/5

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