Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "analiza elementów skończonych" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 58
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Wyświetlanie 1-15 z 58

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies