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Wyświetlanie 1-15 z 984
Tytuł:
Longitudinal shearing of elastic-plastic fibrous composite with frictional fibre-matrix interface
Podłużne ścinanie sprężyso-plastycznego kompozytu włóknistego z uwzględnieniem tarcia na powierzchniach włókien
Autorzy:
Więckowski, Z.
Powiązania:
https://bibliotekanauki.pl/articles/281355.pdf
Data publikacji:
1998
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
homogenisation
finite element method
duality
Opis:
The problem of macroscopic behaviour of periodic, elastic-plastic, fibrous composite material with frictional fibre-matrix interface is considered. Anti-plane shear of the material is analysed. The problem is formulated with the help of variational inequalities using the two approaches: displacement-based and stress-based ones. The variational inequalities are solved using the finite element method. In the case of stress-based approach, the Prandl stress function is utilized. The obtained effective constitutive model of the composite can be used directly in analysis of the problem of torsion of a composite bar with a fine, periodic structure.
W pracy rozważono zagadnienie efektywnych własności periodycznego, sprężysto-plastycznego kompozytu włóknistego, poddanego stanowi anty-płaskiego ścinania, uwzględniając zjawisko tarcia na powierzchni łączącej włókno i matrycę. Zagadnienie zostało sformułowane w przemieszczeniach i naprężeniach w postaci nierówności wariacyjnych, które rozwiązano za pomocą metody elementów skończonych. W przypadku sformułowania naprężeniowego zastosowano funkcje naprężeń Prandtla. Otrzymane efektywne związki konstytutywne dla rozważanego kompozytu mogą być bezpośrednio wykorzystane w analizie zagadnienia swobodnego skręcania pręta kompozytowego o periodycznej strukturze włóknistej.
Źródło:
Journal of Theoretical and Applied Mechanics; 1998, 4; 854-877
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical aspects of dynamic, geometrically non-linear calculations of elasto-viscoplastic plates
Autorzy:
Kłosowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1954536.pdf
Data publikacji:
1999
Wydawca:
Politechnika Gdańska
Tematy:
dynamics
viscoplasticity
finite element method
Opis:
In the paper numerical aspects of elasto-viscoplastic dynamic calculations of circular plates are presented. Numerical results are compared with experiments carried out in the laboratory. Each plate is calculated using the self-built computer program based on the finite element method. The Gaussian quadtrature is used for the surface integration and some difficulties concerning the choice of the order of this integration are discussed. To integrate the constitutive equations (the first order differential equations), and the equations of motion (the second order differential equations), it is necessary to use proper value of the time step. Some remarks on selection of this value are given. Density of the finite element mesh used for discretisation of the plate is studied. It was found that the number of elements has bigger influence on the quality of the results than t he number of layers used to describe the changes of stresses through the thickness of the plate. Finally, some comments on the choice of the model of damping are made. An approximate method of introduction of this factor in the calculations is presented.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1999, 3, 2; 187-199
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculation of soil displacements due to retaining wall construction
Autorzy:
Kudella, P.
Mayer, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/1954560.pdf
Data publikacji:
2000
Wydawca:
Politechnika Gdańska
Tematy:
finite element method
soil mechanics
Opis:
With regard to serviceability state deformations, diaphragm walls and slurry walls cause considerable soil deformations during trench construction. 3-dimensional finite element analyses are able to quantify these deformations. They are compared to measurements and to the results of simplified 2-dimensional models. The dependence of soil stiffness on the actual state can be accounted for by using a hypoplastic constitutive law. Trench geometry and construction sequence are considered as factors of influence. It is shown, how the wall construction process can be modelled at the beginning of an overall 2-dimensional deformation analysis using prescribed initial deformation or stress fields.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2000, 4, 3; 453-468
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of discretization objects continuum implemented in fem preprocessors
Autorzy:
Korga, S.
Makarewicz, A.
Lenik, K.
Powiązania:
https://bibliotekanauki.pl/articles/102103.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
discretization
finite element method
models
Opis:
Finite Element Method (FEM) called Finite Element Analysis is a tool for computer-aided engineering and analysis. It is used to solve problems related to changes in the geometry of the structure as a result of external factors. FEM is used to model engineering processes where real objects are converted to discrete models. Finite Element Method uses a method of obtaining approximate solutions by approximation of partial differential equations. The process of testing and mathematical computation model is described by the equations function of the position and time for the nodes. The development of individual models and their groups and definitions of boundary conditions are carried out using computer programs for FEM.
Źródło:
Advances in Science and Technology. Research Journal; 2015, 9, 28; 130-133
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A finite element model for abrasive waterjet machining
Autorzy:
Hassan, A. I.
Kosmol, J.
Powiązania:
https://bibliotekanauki.pl/articles/279301.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
waterjet machining
finite element method
Opis:
This paper presents a first attempt to model abrasive waterjet (AWJM) machining process using the powerful tool of the finite element method (FEM) in order to explain the abrasive particle-workpiece interaction. The new model takes into account precise representation of the constitutive behaviour of the workpiece material under AWJ dynamic loading conditions which was ignored in previous AWJM models. In the present model, forces acting on the abrasive particle need not be initially determined, as in previous AWJM studies, as they are automatically calculated at each time step. The results show that the finite element method is a useful tool in predicting abrasive-material interaction and AWJ depth of cut.
Modelowanie obróbki strumieniem wodnościernym metodą elementów skończonych. W artykule przedstawiono pierwsze podejście do modelowania obróbki strumieniem wodnościernym metodą elementów skończonych. Celem badań jest próba wyjaśnienia zjawisk występujących na styku ścierniwa i przedmiotu obrabianego. Ten nowy model w sposób precyzyjniejszy uwzględnia właściwości materiału poddanego dynamicznym obciążeniom, co we wcześniejszych modelach nie było uwzględniane. W modelu tym nie trzeba definiować początkowej siły działającej na ścierniwo (jak to miało miejsce w poprzednich modelach), ponieważ jest ona automatycznie obliczana w każdym kroku czasowym. Wyniki symulacji pokazują, że MES jest bardzo dobrym narzędziem do przewidywania reakcji pomiędzy ścierniwem i przedmiotem obrabianym oraz głębokości skrawania.
Źródło:
Journal of Theoretical and Applied Mechanics; 2000, 38, 4; 957-968
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Coupled Smoothed Finite Element-Boundary Element Method for Structural-Acoustic Analysis of Shell
Autorzy:
Tian, W.
Yao, L.
Li, L.
Powiązania:
https://bibliotekanauki.pl/articles/177260.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SFEM
smoothed finite element method
FEM
finite element method
BEM
boundary element method
structural-acoustic analysis
Opis:
Nowadays, the finite element method (FEM) – boundary element method (BEM) is used to predict the performance of structural-acoustic problem, i.e. the frequency response analysis, modal analysis. The accuracy of conventional FEM/BEM for structural-acoustic problems strongly depends on the size of the mesh, element quality, etc. As element size gets greater and distortion gets severer, the deviation of high frequency problem is also clear. In order to improve the accuracy of structural-acoustic problem, a smoothed finite-element/boundary-element coupling procedure (SFEM/BEM) is extended to analyze the structural-acoustic problem consisting of a shell structure interacting with the cavity in this paper, in which the SFEM and boundary element method (BEM) models are used to simulate the structure and the fluid, respectively. The governing equations of the structural-acoustic problems are established by coupling the SFEM for the structure and the BEM for the fluid. The solutions of SFEM are often found to be much more accurate than those of the FEM model. Based on its attractive features, it was decided in the present work to extend SFEM further for use in structural-acoustic analysis by coupling it with BEM, the present SFEM/BEM is implemented to predict the vehicle structure-acoustic frequency response analysis, and two numerical experiments results show that the present method can provide more accurate results compared with the standard FEM/BEM using the same mesh. It indicates that the present SFEM/BEM can be widely applied to solving many engineering noise, vibration and harshness (NVH) problems with more accurate solutions.
Źródło:
Archives of Acoustics; 2017, 42, 1; 49-59
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of selected contact algorithms types in terms of their parameters selection
Autorzy:
Panowicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/245114.pdf
Data publikacji:
2013
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
finite element method
contact
penalty method
Opis:
The analysis of many engineering problems involves not only deformation of the considered system, but occurrence of the interaction between the individual separate elements of the system as well. The occurrence of friction is the most common phenomenon occurring during this interaction. In the case of intense friction, the heat released in this process is also important. In computer methods of mechanics, the process of interaction between bodies is carried out using special algorithms. The most frequently applied are: the penalty method, the barrier method, direct elimination of constraints, the Lagrange multiplier method, the perturbed Lagrangian method, the augmented Lagrangian method, Nitsche method. Owing to its easy implementation process, an approach based on a penalty function is often applied. In this approach, the contact between the bodies can be identified with the presence of the spring between the elements of the bodies in the contact. The stiffness of the spring depends on: material bulk modulus, face area, volume or shell diagonal and a numerically selected scale factor. The article will present the results of analyses that will allow fast and easy selection of its value. In the analyses there were presented the results considering the basic types of contacts: node to surface, surface to surface and surface to surface mortar.
Źródło:
Journal of KONES; 2013, 20, 1; 263-268
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The stability of a steel welded girder with bending and shear forces included
Autorzy:
Sygulski, R.
Guminiak, M.
Polus, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/387654.pdf
Data publikacji:
2017
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
buckling analysis
finite element method
boundary element method
Opis:
The stability of the element of a steel welded girder subjected to bending and shear forces is considered. The considered element is a rectangular plate supported on boundary. The type of a plate boundary conditions depend on the types (thickness) of the stiffeners. Considered plate is loaded by in-plane forces causing bending and shear effects. The Finite Element Method was applied to carry out the analysis. Additionally the Boundary Element Method in terms of boundary-domain integral equation was applied to evaluate the critical shear loading.
Źródło:
Acta Mechanica et Automatica; 2017, 11, 1; 14-19
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using the finite element method in the modeling of layered composite delamination
Autorzy:
Tucki, K.
Powiązania:
https://bibliotekanauki.pl/articles/410736.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
delamination
composite
analysis
finite element method
Opis:
The article presents issues associated with an analysis of the process of delamination of fibrous composite using the Finite Element Method. Research encompassed three computer modelling sessions for delamination of the material for three different values of distance between the test force application point and the middle of the laminate. The results, encompassing the force value and displacement, were then compared to identify the correlation between these variables and the distance from the force application point. The model correctness was also verified by comparing the value of forces modelled with the real values, obtained during an experiment. On the basis of the results obtained with regard to the size of the force applied, it was concluded that the numerical model represented well the mathematical model presented by Comanho. The negative result errors were due to the increased sensitivity of the software to the laminate fracture phenomenon, occurring during the experiment. Thanks to good representation of the model, it can be used interchangeably with numerical calculations.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2016, 5, 2; 51-62
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Finite element analysis of ventilation system fire damper dynamic time-history
Autorzy:
Skibicki, D.
Pejkowski, Ł.
Stopel, M.
Powiązania:
https://bibliotekanauki.pl/articles/259158.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
fire barriers
earthquake
finite element method
Opis:
The paper presents results of the numerical analysis of the fire damper used in ventilation systems under the earthquake loading. The research was conducted in accordance with the recommendations of the Nuclear Safety Standards Commission. The aim of the analysis was to examine the fire damper with respect to its resistance to service loadings, structural integrity, and capability to stay operative after an earthquake. The analysis was carried out using the Finite Element Method in LS-Dyna software. The earthquake loading was modelled as accelerations, measured in three directions during the earthquake. For modelling of the materials behaviour, material models taking into account the influence of strain rate on hardening were used. The analysis consisted of three stages, which were: loading the construction with the earth gravity, earthquake simulation by loading with accelerations in three directions, and, finally, closing the fire damper. The analysis has shown that some of the construction elements undergo plastic deformations. However, the performed simulation of fire damper closing showed that despite these deformations, the device remains capable to keep its functionality and the damper closes hermetically. The results of the analysis were important design indications for the fire damper prototype.
Źródło:
Polish Maritime Research; 2017, 4; 116-123
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of gear micropump body asymmetry on stress distribution
Autorzy:
Kollek, W.
Osiński, P.
Warzyńska, U.
Powiązania:
https://bibliotekanauki.pl/articles/259689.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
gear micropump
microhydraulics
finite element method
Opis:
The paper presents the results of numerical calculations of stress distributions in the gear micropump body for applications in hydraulic systems, especially in the marine sector. The scope of the study was to determine the most favorable position of bushings and pumping unit in the gear pump body in terms of stress and displacement distribution in the pump housing. Fourteen cases of gear pump bushings and pumping unit locations were analyzed: starting from the symmetrical position relative to the central axis of the pump, up to a position shifted by 2.6 mm towards the suction channel of the pump. The analysis of the obtained calculation results has shown that the most favorable conditions for pump operation are met when the bushings are shifted by 2.2 mm towards the suction channel. In this case the maximal stress was equal to 109 MPa, while the highest displacement was about 15μm. Strength and stiffness criteria in the modernized pump body were satisfied.
Źródło:
Polish Maritime Research; 2017, 1; 60-65
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical model of mass transfer in porous medium
Autorzy:
P'yanylo, Y.D.
Lopuch, N.B.
Powiązania:
https://bibliotekanauki.pl/articles/1933956.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska
Tematy:
gas filtration
finite element method
discretization
Opis:
A new numerical model of gas filtration in a porous medium is proposed and investigated. Gas filtration is modeled with a nonlinear differential equation in partial derivatives. Methods of solving the equation are discussed. A computer experiment basing on real-experiment-extracted input physical and geometrical parameters is performed and its results are analyzed. The received results agree well with the corresponding experimental data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2012, 16, 3-4; 229-238
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of porous ceramics microstructure
Autorzy:
Miedzińska, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/298116.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
porous ceramics
finite element method
microstructure
Opis:
The presented research is directed to the porous ceramics microstructural behaviour assessment with the use of numerical methods. Such new material can be used for thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. One of the newest and most interesting applications, considered in this work, is a usage of those materials for production of proppants for hydraulic fracturing of shale rocks. The hydraulic fracturing is a method of gas recovery from unconventional reservoirs. A large amount of fracturing fluid mixed with proppant (small particles of sand or ceramics) is pumped into the wellbore and its pressure causes the rock cracking and gas release. After fracturing the fluid is removed from the developed cracks leaving the proppant supporting the fracture. In the paper the grain porous ceramics which is used for proppant particles preparation was studied. The influence of grains distribution on the porous ceramics mechanical behaviour during compression was simulated with the use of finite element method.
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(1); 5-17
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling conveyor belt passage with a driving drum using finite element methods
Autorzy:
Mikušová, N.
Milľo, S.
Powiązania:
https://bibliotekanauki.pl/articles/102488.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
belt conveyor
belt
finite element method
Opis:
Finite element methods are used in many disciplines for the development of products, typically in mechanical engineering (for example in automotive industry, biomechanics, etc.). Some modern programs of finite element methods have specific tools (electromagnetic, fluid and structural simulations). The finite elements methods allow detailed presentation of structures by bending or torsion, complete design, testing and optimization before the prototype production. The aims of this paper were model a conveyor belt passage with a driving drum. The model was created in Abaqus CAE program. The created model presented data about forces, pressures, and deformation of the conveyor belt.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 239-246
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical 3D FEM Simulation and Experimental Analysis of Tribological Aspects in Turning Inconel 718 Alloy
Autorzy:
Nieslony, P.
Grzesik, W.
Laskowski, P
Zak, K.
Powiązania:
https://bibliotekanauki.pl/articles/99551.pdf
Data publikacji:
2015
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
finite element method
modelling
friction
tribology
Opis:
This paper presents 3D FEM simulation results performed for the power law and JC (Johnson-Cook) material constitutive models for two sets of friction parameters. The friction conditions were tested using pin-on-disc tribometer. Machining tests were carried out using carbide cutting tools coated with a TiAlN monolayer without coolants. The selection of machining conditions was based on real production data. In addition, a real CAD model of the cutting tool insert was implemented. Moreover, an advanced technique of meshing the cutting edge and the grooved rake face was applied. The simulations include cutting forces and cutting temperature. Finally, FEM simulations were compared with measurements in order to improve the simulation strategy.
Źródło:
Journal of Machine Engineering; 2015, 15, 1; 46-57
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 984

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