Temat: finite - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Laminar mixing flow in a stirred vessel
Autorzy:: Egidi, N.
Misici, L.
Piergallini, R.
Powiązania:: https://bibliotekanauki.pl/articles/1964081.pdf
Data publikacji:: 2001
Wydawca:: Politechnika Gdańska
Tematy:: mixing flow
laminar mixing flow
viscous liquids
finite elements
finite element analysis
finite element method
Opis:: Using finite element method we study the transient motion of fluid particles in a 3D cavity, when the fluid is incompressible viscous and with uniform density. The fluid is mixed under the action of four-blades turbine that is simulated by a velocity function. The mixing quality of the fluid is studied qualitatively, by visualization, and quantitatively, by measuring the indices of diffusion and dispersion.
Źródło:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2001, 5, 1; 71-83
1428-6394
Pojawia się w:: TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Finite element analysis and design of piezoelectric controlled wmart structures
Autorzy:: Berger, H.
Gabbert, U.
Koppe, H.
Seeger, F.
Powiązania:: https://bibliotekanauki.pl/articles/279731.pdf
Data publikacji:: 2000
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: smart structures
finite element analysis
piezoelasticity
Opis:: The paper gives an overview of about recent developements in modelling, numerical analysis and design of piezoelectric controlled smart structures. Then, the theoretical basis of a general purpose finite element simulation tool developed by the authors is presented. This tool contains a number of coupled thermo-electro-mechanical 1D, 2D, 3D as well as layered plate and shell finite elements for simulating controlled structures in static and dynamic applications, where also optimization algorithms (e.g. for actuator location) can be included. Finally, three examples; i.e., actively controlled beam, vibration isolation of a box, and vibration isolation of a plate as a part of an exited cylinder structure, are presented to demonstrate the capability and efficiency of the simulation and design tool.
Zastosowanie metody elementów skończonych do analizy i projektowania piezoelektrycznie sterowanych konstrukcji inteligentnych Praca daje przegląd nowych osiągnięć z zakresu modelowania, analizy numerycznej i projektowania konstrukcji inteligentnych z piezoelektrycznymi elementami wykonawczymi. Omówiono teoretyczne podstawy opracowanych przez autorów narzędzi symulacyjnych korzystających z metody elementów skończonych. Narzędzie to zawiera zarówno jedno-, dwu- i trójwymiarowe sprzężone elementy termo-elektro-mechaniczne, jak i elementy skończone nadające się do symulacji statyki i dynamiki płyt i powłok warstwowych ze sterowaniem. Możliwe jest również włączenie algorytmów optymalizacyjnych, np. służących do optymalnego wyznaczania położenia aktuatora. Aktywnie sterowana belka, zagadnienie wibroizolacji pojemnika oraz wibroizolacji płyty jako części pobudzanej konstrukcji walcowej są przykładami pokazującymi możliwości i efektywność opracowanego narzędzia.
Źródło:: Journal of Theoretical and Applied Mechanics; 2000, 38, 3; 476-498
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Assessment of Mechanical Properties of Offroad Vehicle Tire: Coupons Testing and FE Model Development
Autorzy:: Baranowski, P.
Bogusz, P.
Gotowicki, P.
Małachowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/387025.pdf
Data publikacji:: 2012
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: tire
rubber
mechanical properties
finite element analysis
Opis:: In this paper the subsequent stages of tire rubber coupons mechanical properties experimental assessment are presented. Experimental uniaxial tension and compression tests were carried out on the strength testing machine with the assistance of high-speed camera and special software for strain measurements. Obtained stress-strain curves were applied into the chosen Mooney-Rivlin constitutive rubber material model in order to estimate necessary material constants. Simultaneously, the numerical off-road vehicle tire model was developed. Geometry of the tire and rim was achieved using a 3D scanning method. Moreover, with the assistance of microscope and X-ray device the tire cords pattern was verified, which in the next stages was implemented into the FE model. Consequently, tire radial deflection test was simulated in order to validate evaluated material constants and proposed concept of the numerical tire modelling. Obtained results were compared with the actual deflection test data included in technical documentation of the tire.
Źródło:: Acta Mechanica et Automatica; 2012, 6, 2; 17-22
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical homogenization of fiber-reinforced composites with complex microstructural features
Autorzy:: Romanowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/280990.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fiber-reinforced composites
micromechanics
finite element analysis
Opis:: A micromechanical model for solution of the problem of transverse stiffness of unidirectional fiber reinforced composites taking into account the presence of the interphase and a random distribution of fibers over the transverse cross-section has been developed. The influence of interphase properties on the elastic modulus in the transverse direction of glass/epoxy composites has been investigated. It has been found that numerical computations of transverse Young’s modulus obtained from the unit cell models for different fiber volume fractions are in a good agreement with experimental data.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 4; 883-890
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A prediction method for load distribution in threaded connections
Autorzy:: Zhang, D.
Gao, S.
Niu, S.
Liu, H.
Powiązania:: https://bibliotekanauki.pl/articles/949123.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: load distribution
threaded connections
finite element analysis
Opis:: A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 157-168
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Scaled Soil-Structure Interaction Model for Shaking Table Testing
Autorzy:: Goktepe, F.
Omid, A.
Celebi, E.
Powiązania:: https://bibliotekanauki.pl/articles/1031921.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: Soil-structure interaction
shaking table
finite element analysis
Opis:: The primarily goal of this study is to reveal a scaled soil-structure interaction model for small capacity shaking table testing instead of the full-scale field experiments. The prototype of soil-structure interaction system with frame-type building, resting on a sandy soil with shear wave velocity of 536 m/s and unit weight of 12.9 kN/m³ has been selected. For experimental investigations, the realistic site and building structures are scaled with a geometric scaling factor of 1:45. The test model, consisting of six-story steel frame-type building, natural soil and laminar soil container, is designed and constructed to realistically simulate the seismic soil-structure interaction effects of building structures in shaking table tests. In order to verify the geometric scaling factor, the dynamic properties of the fixed-base system for both prototype and scaled model are determined by using finite element analysis. Furthermore, the dynamic parameters for scaled model of a single layer soil, restricted with base-rock, have been compared numerically with the proposed laminar soil container, to provide a good agreement.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 588-590
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Finite element analysis of a superelastic shape memory alloy considering the effect of plasticity
Autorzy:: Jiang, X.
Li, B.
Powiązania:: https://bibliotekanauki.pl/articles/281467.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: SMAs
superelasticity
plasticity
constitutive law
finite element analysis
Opis:: In the present study, a shape memory alloy (SMA) phenomenological constitutive model is proposed that is capable of describing SMA superelastic behavior and the plasticity effect. The phase transformation constitutive model, by using strain and temperature as control variables to judge the phase transformation points in order to avoid the complexity of transformation correction, incorporates plasticity described by the von Mises isotropic hardening model. Further, the proposed model is implemented into the finite element package ANSYS by the user subroutine USERMAT. The results produced by the proposed model of simulated superelastic and plasticity behavior are compared with experimental data taken from the literature.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1355-1368
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: The influence of finite element meshing accuracy on a welding machine for offshore platform’s modal analysis
Autorzy:: Xie, J.
Sun, D.
Xu, C.
Wu, J.
Powiązania:: https://bibliotekanauki.pl/articles/260126.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: finite element analysis
meshing
meshing accuracy
modal analysis
Opis:: The purpose objective of this study was to investigate the influence of finite element meshing accuracy on modal analysis which is one of the basic factors affecting the accuracy of finite element analysis and mostly preoccupies the working staff in pre-processing finite element simulation models. In this paper, we established several finite element models of a welding machine for offshore platform, with the meshing accuracy as the variable and workbench software as the platform for modal analysis, as the same time, comparing the analysis results. The results indicated that for some specific structures and simulation types, mesh refinement alone does not achieve desired results, and the authors indicate that mesh refinement is rarely related to the equipment’s low-frequency modal analysis but it’s great related to the equipment’s high-frequency modal analysis. The findings of this study may serve as breaking the opinion that smaller mesh size means higher calculation precision and provides references for mesh division practices in low frequency modal analysis.
Źródło:: Polish Maritime Research; 2018, S 3; 147-153
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Correlation of Hardness and Silicon Morphology for Al-Si-Sb Alloy
Autorzy:: Uzun, O.
Yilmaz, F.
Emeksiz, C.
Ergen, S.
Kolemen, U.
Powiązania:: https://bibliotekanauki.pl/articles/356738.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Si alloy
casting
Vickers
finite element analysis
Opis:: In this study, we have focused on the role of silicon morphology on the hardness of eutectic Al–12 wt.% Si–0.5 wt.% Sb alloy solidified at different cooling rates. The alloys were produced by using induction melting, arc-remelting and melt-spinning techniques. The cooling rates of the alloys were determined as 0.5, 60 and ~10⁵°C.s^-1 for induction-melted, arc-remelted and meltspun alloy. The experimental results show that as the cooling rate increased the coarse silicon phase was substantially refined and its morphology altered from sharp need-like to round shape. Two exothermic peaks, attributed to precipitation and coarsening of silicon from supersaturated α-Al, were observed in the DSC curve of MS alloy. Vicker’s hardness of melt-spun alloy was found two times higher than those of IMed and ARed alloys. The lowest hardness of induction-melted alloy was ascribed to the lamellar morphology of silicon, yielding decohesive rupture. This result was confirmed by finite element analyzing.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 467-472
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Numerical Evaluation of Gear Ring Behavior During Various Cooling Conditions
Autorzy:: Perzyński, K.
Madej, Ł.
Szajding, A.
Raga, K.
Kubiak, K.
Niechajowicz, A.
Jaskiewicz, K.
Gronostajski, Z.
Pietrzyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/99546.pdf
Data publikacji:: 2016
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: bainitic transformation
martensitic transformation
finite element analysis
APDL
Opis:: The phase transformation model incorporated via the user subroutines to the commercial finite element software to accurately predict changes occurring during cooling of metallic components is presented in the paper. The cooling process of steel rings used in airplanes was selected as a case study. Particular attention was put on heterogeneities occurring in temperature field, which influence phase transformations and eventually residual stresses. Developed model was used in the present work to evaluate influence of different cooling conditions on ring behaviour.
Źródło:: Journal of Machine Engineering; 2016, 16, 2; 18-26
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Finite element analysis of bipolar plate stamping based on a Yld2000 yield model
Autorzy:: Wang, Wenyao
Xiao, Yao
Guo, Nan
Min, Junying
Powiązania:: https://bibliotekanauki.pl/articles/29520081.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: finite element analysis
bipolar plate
yield model
stamping
Opis:: Finite element analysis is an essential means for bipolar plate design and the optimization of the manufacturing process. However, the accuracy of the finite element simulation is significantly affected by the constitutive model, especially the yield model. In this paper, uniaxial and biaxial tensile tests were conducted to obtain the yield loci of an ultra-thin austenite stainless steel. The Yld2000 yield model was calibrated using the yield loci under different equivalent plastic strains. The microchannel stamping experiment and its finite element simulations were conducted to study the effect of yield model parameters on the finite element simulation of bipolar plate stamping. The results show that the simulation with Yld2000 calibrated by 0.004 and 0.05 equivalent plastic strain has the best prediction accuracy for the microchannel springback and thickness distribution, respectively.
Źródło:: Computer Methods in Materials Science; 2022, 22, 1; 7-12
2720-4081
2720-3948
Pojawia się w:: Computer Methods in Materials Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: A unit-cell approach to prediction of the microbuckling strength of composites with non-uniform fiber imperfections under combined axial compression and in-plane shear
Autorzy:: Romanowicz, Marek
Powiązania:: https://bibliotekanauki.pl/articles/280802.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fiber-reinforced composites
buckling
micro-mechanics
finite element analysis
Opis:: A new micromechanical model for predicting the failure locus of long fiber composites under combined axial compression and in-plane shear is proposed. The model is based on a periodic unit cell with centrally located imperfections. Predictions of the compressive behavior for various biaxial loading ratios are made. The role of distribution of fiber imperfections in predicting the biaxial strength is discussed. The failure locus calculated from the new model is found to be in good agreement with experimental data available in the literature and less conservative than that from the periodic model with uniform imperfections.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 303-316
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Analysis of plastic deformation of semi-crystalline polymers during ECAE process using 135° die
Autorzy:: Aour, B.
Mitsak, A.
Powiązania:: https://bibliotekanauki.pl/articles/280980.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: ECAE
polymers
finite element analysis
plastic strain
back-pressure
Opis:: In this paper, analysis of plastic deformation of high density polyethylene (HDPE) and polypropylene (PP) during an equal channel angular extrusion (ECAE) process is investigated. The effects of ram speed, number of passes, processing route and temperature are tested experimentally using a 135◦ die. The results show that the pressing force decreases with an increase in the number of passes and reaches a saturation state rapidly for routes A and C compared to routes BA and BC . Furthermore, it is found that the reduced curvature of the extruded samples is obtained by route C, however, the maximum warping is obtained by route A. A slight influence of temperature on the reduction of the warping is observed on the extruded samples. In order to predict the plastic strain inside the extruded samples, an elastic viscoplastic model is identified using compressive tests at different strain rates and coupled with the finite element method (FEM). A good correlation is found between the numerical modeling and experimental findings. FEM results show that the PP samples display a higher level of plastic strain compared to HDPE samples. However, almost the same degree of strain heterogeneity is obtained for both polymers. Finally, in order to reduce the warping and improve the strain homogeneity, a controlled back-pressure with small corner angle is expected to be an adequate solution.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 263-275
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Coupled dynamic FE analysis of permanent-magnet mechanical vibration energy harvesting converter
Autorzy:: Kulik, M.
Jagieła, M.
Powiązania:: https://bibliotekanauki.pl/articles/377720.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:: energy harvesting
coupled structural-electromagnetic analysis
finite element analysis
Opis:: The paper presents a coupled dynamic mechanical-electromagnetic finite element analysis of a vibration energy harvesting converter with permanent-magnet excitation. The system consists of a small, miliwatt power range, linear-motion permanent-magnet generator connected to a cantilever-beam spring element. The finite element equations derived for the mechanical part of the system according to the 1-D Timoshenko beam theory are coupled strongly with equations describing the 2-D distribution of magnetic field in the generator and those associated with the electric circuit. The time-stepping procedure based on the Crank-Nicolson discretisation schema is applied to the obtained system of differential-algebraic equations. The model is shown to provide satisfactory predictions of the system dynamic performance which is confirmed experimentally.
Źródło:: Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 85; 245-254
1897-0737
Pojawia się w:: Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Experimental Study of Failure Analysis in Notched and Repaired Fiberglass Epoxy Composite
Autorzy:: Hassoon, Omar Hashim
Enzi, Abass
Kashkool, Lujain H.
Powiązania:: https://bibliotekanauki.pl/articles/2172353.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: damage analysis
GFRP
repaired GFRP
finite element analysis
FEA
Opis:: The composite materials are remarkably increasing in many industry sectors like aircraft, automobiles, oil pipes, and marine boats. This attention comes from their excellent properties, such as lightweight and high strength. However, these materials expose many damages like fiber-matrix debonding, matrix crack, and delamination. The composite structures risked damage through the service life and therefore need to repair to achieve their function with a good performance. This paper focuses on the analysis during the tensile test of samples of fiberglass epoxy composite materials exposed to damage before and after repair. Experimental and numerical investigations are performed to determine and identify mechanical properties and failure analysis between repaired and unrepaired composite plates. Five samples are selected: without hole, 4 mm hole-repaired, stepped hole from 4 to 8 mm, and stepped hole from 4 to 8 mm-repaired. Simulation models are created using the finite element (FE) method to compare them with Abaqus's practical experiments to predict damage during the tensile test. To simulate damage models, interlaminar and intralaminar damage, were used to study initiation and propagation of the samples failure. Results show that the experimental and numerical investigations of the repaired samples have a significant effect on the mechanical properties and failure behavior of the holed and stepped plates compared with unrepaired samples. Also, maximum stress and strain are concentrated around and on both sides of the hole, while the most significant damage occurs around the hole and the axial direction.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 2; 99--108
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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