Готові списки джерел за темами / Solid finit element

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Автор: Grafiati
Опубліковано: 28 травня 2022

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Статті в журналах з теми "Solid finit element":

1

Bindea, M., Claudia Maria Chezan, and A. Puskas. "Numerical Analysis Of Flat Slabs With Spherical Voids Subjected To Shear Force." Journal of Applied Engineering Sciences 5, no. 1 (May 1, 2015): 7–13. http://dx.doi.org/10.1515/jaes-2015-0001.

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Abstract Full flat slabs can be enhanced by using spherical voids to replace the unemployed concrete from the core part of the slab. Therefore we get low self-weighted slabs that can reach a high range of spans, a low material consumption compared to classical solutions used so far. On the other hand, the upsides of these slabs pale against the insecurity in design stage about their punching and shear force behaviour. In this paper it is presented a parametric study about shear force behaviour of flat slabs with spherical voids used in standard condition service. The study was made using the Atena 3D finit element design software, starting form a numerical model gauged on experimental results on real models – scale 1:1. Based on these lab results, the model’s validation was made by overlapping the load – displacement experimental curves on the curves yielded from numerical analyses. The results indicate that under a longitudinal reinforcement rate of lower than 0.50%, flat slabs with spherical voids don’t fail to shear force and over this value the capable shear force decreases in comparison with solid slabs, as the reinforcement rate increases.
2

POTAPOV, ALEXANDER V., and CHARLES S. CAMPBELL. "A HYBRID FINITE-ELEMENT SIMULATION OF SOLID FRACTURE." International Journal of Modern Physics C 07, no. 02 (April 1996): 155–80. http://dx.doi.org/10.1142/s0129183196000168.

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This paper describes an extension to a computer simulation of solid fracture. In the original model, rigid elements are assembled into a simulated solid by "gluing" the elements together with compliant boundaries which fracture when the tensile strength of the glued joints is exceeded. The current extension applies portions of the finite element technique to allow changes in the shapes of elements. This is implemented at the element level and no global stiffness matrix is assembled; instead, the elements interact across the same compliant boundaries used in the rigid element simulation. As a result, the simulated material can conform to any desired shape and thus can handle large elastic and plastic deformation. This model is intended to study the propagation of multitudinous cracks through simulated solids to aid the understanding of problems such as the impact-induced fragmentation of particles.
3

Abdel-Fattah, Mohamed T., Ian D. Moore, and Tarek T. Abdel-Fattah. "Behaviour of elevated concrete silos filled with saturated solids." Canadian Journal of Civil Engineering 33, no. 3 (March 1, 2006): 227–39. http://dx.doi.org/10.1139/l05-108.

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A finite-element solution is introduced for simulating the filling process of elevated concrete silos filled with saturated solids. An axisymmetric finite-element model is used to represent both the solids and the structure. The bulk solids are modeled using an elastoplastic model, whereas the structure is modeled using a linear elastic model. The interaction between the two materials is modeled using interface elements to permit relative movement. The filling process is idealized via a multistage numerical technique capable of representing both undrained and drained conditions. The effect of the filling process may be time-dependent. The excess pore-water pressure caused by the filling process may significantly influence the magnitudes of internal forces. Moreover, the design critical sections of the same silo element may correspond to different bulk solid conditions (undrained or drained). Practically, the ring beam stiffness may only influence hoop compressions in the silo elements at the wall–hopper junction. The results presented may be used to design tests to evaluate existing silos.Key words: elevated concrete silos, silo filling, finite-element analysis, elastoplastic model, consolidation, hopper, ring beam stiffness.
4

Tanaka, Seizo, Muneo Hori, and Tsuyoshi Ichimura. "Hybrid Finite Element Modeling for Seismic Structural Response Analysis of a Reinforced Concrete Structure." Journal of Earthquake and Tsunami 10, no. 05 (December 2016): 1640015. http://dx.doi.org/10.1142/s1793431116400157.

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For rational seismic structural response analysis of a Reinforced Concrete (RC) structure, this paper presents a solid element in which a sophisticated concrete constitutive relation and cracking functionality are implemented. Hybrid finite element modeling that uses solid and beam elements for concrete and steel rebar is proposed, made tougher with a method of constructing the hybrid finite element. Well-balanced modeling is possible by first generating beam elements for the steel rebars and then generating solid elements for the concrete with nodes of the beam elements being shared by the solid element. A numerical experiment was carried out for a RC column subjected to unilateral loading, in order to examine the potential applicability of the hybrid finite element modeling. The computed results are compared with the experimental data, and the nonlinear relation between the displacement and reaction force is reproduced to some extent.
5

He, Xiao Cong. "Stress Analysis of Bonded Joint Using Solid Element Combinations." Applied Mechanics and Materials 467 (December 2013): 332–37. http://dx.doi.org/10.4028/www.scientific.net/amm.467.332.

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This paper describes some finite element combinations to analyse the mechanical behaviour of bonded joints. In finite element models five layers of solid elements were used across the adhesive layer in order to increase the accuracy of the results. The finite elements were refined gradually in steps from adherends to adhesive layer. In these models, most of the adherends and adhesive were modeled using solid brick elements but some solid triangular prism elements were used for a smooth transition. Comparisons are performed between different types of first-order element combinations in order to find a suitable model to predict the mechanical behaviour of adhesively bonded joints.
6

Zhan, Li Hua, Xiao Long Xu, and Ming Hui Huang. "Influence of Element Types on Springback Prediction of Creep Age Forming of Aluminum Alloy Integral Panel." Materials Science Forum 773-774 (November 2013): 512–17. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.512.

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Creep Age Forming (CAF) is an effective forming technique combined forming and heat treatment, based on creep and age hardening characteristics of some aluminum alloys. It has been widely used to manufacture large integral panels with airfoil sections and complex curvatures of high strength aluminum alloy. The aim of this paper is to study the influence of element types on springback prediction of creep age forming of aluminum alloy integral panel. Firstly, the finite element models are built by 3D-solid elements and Shell elements separately. And then a set of creep aging constitutive equations of 7055 aluminum alloy are implemented into the commercial FE solver MSC.MARC through user defined subroutine. Finally, springback values predicted by 3D-solid elements model and Shell elements model respectively are compared under different height to width ratios. Some important conclusions were drawn. For the reinforcing panel with the height to width ratio is more than 5:1, shell elements should be used to get more accurate springback prediction result. If the height to width ratio is less than 5:1, solids elements should be used. Above conclusions provide theoretical basis for the study of CAF of the aluminum alloy integral panel by finite element simulation method.
7

Shen, Hong, Jun Hu, and Zhenqiang Yao. "Mixed-dimensional coupling modeling for laser forming process." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, no. 16 (February 20, 2014): 2950–59. http://dx.doi.org/10.1177/0954406214525136.

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Efficient laser forming modeling for industrial application is still in the developing stage and many researchers are in the process of modifying it. Conventional three-dimensional finite element models are still expensive on computational time. In this paper, a finite element model adopting a shell-solid coupling technique is developed for the thermomechanical analysis of laser forming process. In the shell-solid coupling method, an additional shell element plane is utilized to transfer heat flux and displacement from the solid elements to the shell elements. The effects of the additional interface shell element thickness on temperature distribution and final distortion are investigated. The presented shell-solid coupling method is evaluated by the results of three-dimensional simulations and experimental data.
8

Abdullahi, Mustapha, and S. Oyadiji. "Acoustic Wave Propagation in Air-Filled Pipes Using Finite Element Analysis." Applied Sciences 8, no. 8 (August 7, 2018): 1318. http://dx.doi.org/10.3390/app8081318.

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The major objective of this work is to develop an efficient Finite Element Analysis (FEA) procedure to simulate wave propagation in air-filled pipes accurately. The development of such a simulation technique is essential in the study of wave propagation in pipe networks such as oil and gas pipelines and urban water distribution networks. While numerical analysis using FEA seems superficially straight forward, this paper demonstrates that the element type and refinement used for acoustic FEA have a significant effect on the accuracy of the result achieved and the efficiency of the computation. In particular, it is shown that the well-known, better overall performance achieved with 3D solid hexahedral elements in comparison with 2D-type elements in most stress and thermal applications does not occur with acoustic analysis. In this paper, FEA models were developed taking into account the influence of element type and sizes using 2D-like and 3D element formulations, as well as linear and quadratic nodal interpolations. Different mesh sizes, ranging from large to very small acoustic wavelengths, were considered. The simulation scheme was verified using the Time of Flight approach to derive the predicted acoustic wave velocity which was compared with the true acoustic wave velocity, based on the input bulk modulus and density of air. For finite element sizes of the same order as acoustic wavelengths which correspond to acoustic frequencies between 1 kHz and 1 MHz, the errors associated with the predictions based on the 3D solid hexahedral acoustic elements were mostly greater than 15%. However, for the same element sizes, the errors associated with the predictions based on the 2D-like axisymmetric solid acoustic elements were mostly less than 2%. This indicates that the 2D-like axisymmetric solid acoustic elements are much more efficient than the 3D hexahedral acoustic elements in predicting acoustic wave propagation in air-filled pipes, as they give higher accuracies and are less computationally intensive. In most stress and thermal FEA, the 3D solid hexahedral elements are much more efficient than 2D-type elements. However, for acoustic FEA, the results show that 2D-like axisymmetric elements are much more efficient than 3D solid hexahedral elements.
9

Dumitru, Nicolae, Raluca Malciu, Madalina Calbureanu, Sorin Dumitru, and Gabriel Cătălin Marinescu. "Dynamic Analysis of a Mobile Mechanical System with Deformable Elements." Advanced Materials Research 463-464 (February 2012): 1242–45. http://dx.doi.org/10.4028/www.scientific.net/amr.463-464.1242.

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The paper presents a method for studying mechanisms with deformable elements, based on overlapping the solid rigid motion over the elastic solid one, in order to identify the dynamic response of the system. Modeling was based on finite element method, so the cinematic elements were meshed in bar type finite elements and the degrees of freedom per node were settled according to the motion character (planar or spatial). A Lagrange formulation of the finite element was adopted for the deformable elements connected in multibody systems. In order to define the joints constraints, the conditions for compatibility between elements were defined using a Boolean constant matrix. Computer processed results were verified by an experimental model.
10

Kožar, Ivica, and Adnan Ibrahimbegović. "Finite element formulation of the finite rotation solid element." Finite Elements in Analysis and Design 20, no. 2 (June 1995): 101–26. http://dx.doi.org/10.1016/0168-874x(95)00014-k.

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Статті в журналах Дисертації Книги

Дисертації з теми "Solid finit element":

1

Wei, Guoqiang. "Towards overall adaptive modeling based on solid-shell and solid-beam approaches for the static and dynamic finite element analysis of structures." Thesis, Compiègne, 2021. https://bibliotheque.utc.fr/Default/doc/SYRACUSE/2021COMP2618.

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La méthode des éléments finis est couramment utilisée depuis les années 1970 pour prédire le comportement de structures telles que des automobiles, des avions, des machines, des ponts ou des bâtiments. Les choix de modélisation sont essentiels afin de construire un modèle représentatif, tout en maîtrisant le nombre de degrés de liberté. De nombreux travaux ont cherché à optimiser le modèle d’un point de vue du maillage en proposant notamment des techniques de maillage adaptatif. En revanche, concernant le choix de théorie, peu de travaux ont été menés pour obtenir un modèle éléments finis optimal. Dans le contexte de l’analyse linéaire statique et vibratoire, cette thèse a pour objectif de proposer une méthodologie de modélisation adaptative afin d’obtenir un modèle éléments finis optimal d’un point de vue du choix de théorie. Le maillage, composé uniquement d’éléments volumiques, est raffiné à chaque itération de la méthodologie. Un choix approprié entre les théories de poutre, de coque et d’élasticité 3D est effectué sur chaque élément fini à l’issue de chaque analyse. Dans les zones où les théories de poutre ou de coque sont pertinentes, des champs de déplacements spécifiques sont appliqués. De nouvelles approches volume-coque et volume-poutre, basées respectivement sur la théorie des coques et la théorie des poutres, sont développées à cet effet. Pour chacune de ces approches, des théories de premier ordre et d’ordre supérieur sont proposées. Dans ces zones l’application de relations cinématiques aux noeuds du maillage volumique, se traduisant par des équations linéaires, mène à une réduction du nombre de degrés de liberté. Dans le cadre de l’analyse statique et vibratoire, plusieurs exemples sont traités pour évaluer la méthodologie de modélisation adaptative. Les résultats numériques obtenus sont toujours très proches de ceux d’un modèle volumique de référence et la modélisation adaptative mène à une réduction significative de la taille du modèle
The finite element method has been widely used since the 1970s to predict the behavior of structures such as automobiles, airplanes, machines, bridges or buildings. The modeling choices are essential to build a representative model and control the number of degrees of freedom. Many works have sought to optimize the model from a mesh point of view, namely by proposing adaptive meshing techniques. On the other hand, concerning the theory choice, seldom work has been carried out to obtain an optimal finite element model. In the context of static and vibratory linear analysis, this thesis aims to propose an adaptive modeling methodology in order to obtain an optimal finite element model from the theory choice point of view. The mesh, composed only of solid elements, is refined at each iteration of the methodology. An appropriate choice between beam, shell and 3D elasticity theories is made on each finite element of the model at each analysis. In areas where beam or shell theories are relevant, specific displacement fields are applied. New solid-shell and solid-beam approaches, based respectively on shell theory and beam theory, have been developed for this purpose. For each of these two approaches, first-order and higher-order theories are proposed. In these areas, the application of kinematic relations at nodes of the solid mesh, by using linear equations, leads to a reduction of the number of degrees of freedom. In the context of static and vibratory analysis, several examples are treated to evaluate the methodology of adaptive modeling. The numerical results obtained are always very close to those of a reference solid model and the adaptive modeling method leads to a significant reduction in the model size
2

Arabshahi, Saeed. "Finite element idealisation in a solid modelling environment." Thesis, University of Leeds, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305391.

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3

Zafra-Camón, Guillermo. "Calculation of global properties of a multi-layered solid wood structure using Finite Element Analysis." Thesis, Uppsala universitet, Tillämpad mekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-298677.

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Finite Element Method (FEM) is a powerful numerical tool which, combined with the fast development of Computer Science in the lastdecades, had made possible to perform mechanical analysis of a widerange of bodies and boundary conditions. However, the complexity of some cases may turn the calculationprocess too slow and sometimes even unaffordable for most computers. This work aims to simplify an intricate system of layers withdifferent geometries and material properties by approximating itthrough a homogeneous material, with unique mechanical parameters.Besides the Finite Element analysis, a theoretical model is created, in order to understand the basis of the problem, and, as a firstapproach, check whether the assumptions made in the FEM model areacceptable or not. This work intends to make a small contribution to the understandingof the mechanical behaviour of the Vasa vessel, which will eventuallylead to the design of a new support structure for the ship. The preservation of the Vasa is a priority for the Swedish Property Board, as it is one of the main monuments of Sweden.
4

Glaws, Andrew Taylor. "Finite Element Simulations of Two Dimensional Peridynamic Models." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/48121.

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This thesis explores the science of solid mechanics via the theory of peridynamics. Peridynamics has several key advantages over the classical theory of elasticity. The most notable of which is the ease with which fractures in the the material are handled. The goal here is to study the two theories and how they relate for problems in which the classical method is known to work well. While it is known that state-based peridynamic models agree with classical elasticity as the horizon radius vanishes, similar results for bond-based models have yet to be developed. In this study, we use numerical simulations to investigate the behavior of bond-based peridynamic models under this limit for a number of cases where analytic solutions of the classical elasticity problem are known. To carry out this study, the integral-based peridynamic model is solved using the finite element method in two dimensions and compared against solutions using the classical approach.
Master of Science
5

Unosson, Mattias. "On failure modelling in finite element analysis : material imperfections and element erosion." Doctoral thesis, Linköping : Linköpings universitet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4679.

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6

Giffin, Brian Doran. "Partitioned Polytopal Finite-Element Methods for Nonlinear Solid Mechanics." Thesis, University of California, Davis, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10752138.

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This work presents a novel polytopal finite-element framework that addresses the collective issues of discretization sensitivity and mesh generation for computational solid mechanics problems. The use of arbitrary polygonal and polyhedral shapes in place of canonical isoparametric elements seeks to remediate issues pertaining to meshing and mesh quality (particularly for irregularly shaped elements), while maintaining many of the desirable features of a traditional finite element method.

A general class of partitioned element methods (PEM) is proposed and analyzed, constituting a family of approaches for constructing piecewise polynomial approximations to harmonic shape functions on arbitrary polytopes. Such methods require a geometric partition of each element, and under certain conditions will directly yield integration consistency. Two partitioned element methods are explored in detail, including a novel approach herein referred to as the discontinuous Galerkin partitioned-element method (DG-PEM). An implementational framework for the DG-PEM is presented, along with a discussion of its associated numerical challenges.

The numerical precision of the PEM is explored via classical patch tests and single element tests for a representative sampling of polygonal element shapes. Solution sensitivity with respect to element shape is examined for a handful of problems, including a mesh convergence study in the nearly incompressible regime. Finally, the efficacy of the DG-PEM is assessed for a number of benchmark problems involving large deformations and nonlinear material behavior.

7

Vajjhala, Surekha 1975. "Finite element analysis of Voronoi cellular solids." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/84760.

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8

Kihlander, Jesper. "Finite Element simulation of vibrating plastic components." Thesis, Linköpings universitet, Hållfasthetslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-89984.

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For automotive plastic parts there is a clear demand on an increased quality of the FE models. This demand is related to the increased use of simulations, both due to a reduced number of prototypes and an increased number of load cases. There have been studies showing a change of dynamic properties in injection molded components. The conclusion from these studies are that the change depends on residual stresses built in during the injection process. This study use simple models to try to get a working method and from the results find out the basic relations between residual stresses and dynamic properties. A method was developed and the results showed that the residuals had a major impact on the dynamic properties. Continuation on this work would be to use more complex models, to try to mimic results from reference studies and tests.
9

Djabella, Hocine. "Finite element analysis of elastic stresses in coated surfaces." Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334019.

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10

Bari, Mahdi. "A finite element study of shell and solid element performance in crash-box simulations." Thesis, Högskolan Väst, Avdelningen för maskinteknik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-7575.

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This thesis comprehends a series of nonlinear numerical studies with the finite element software's LS-Dyna and Impetus AFEA. The main focus lies on a comparative crash analysis of an aluminium beam profile which the company Sapa technology has used during their crash analysis. The aluminium profile has the characteristic of having different thickness over span ratios within the profile. This characteristic provided the opportunity to conduct a performance investigation of shell and solid elements with finite element analysis. Numerical comparisons were made between shell and solid elements where measurable parameters such as internal energy, simulation times, buckling patterns and material failures were compared to physical tests conducted prior to this thesis by Sapa technology. The performance investigation of shell and solid elements was initiated by creating models of the aluminium profile for general visualization and to facilitate the meshing of surfaces. The meshing procedure was considered to be an important factor of the analysis. The mesh quality and element orientations were carefully monitored in order to achieve acceptable results when the models were compared to physical tests. Preliminary simulations were further conducted in order to obtain a clear understanding of software parameters when performing crash simulations in LS-Dyna and Impetus AFEA. The investigated parameters were element formulations and material models. A general parameter understanding facilitated in the selection of parameters for actual simulations, where material failure and damage models were used. In conclusion, LS-Dyna was observed to provide a bigger internal energy absorption during the crushing of the beam with longer simulation times for solid elements when compared to shell elements. Impetus AFEA did on the other hand provide results close to physical test data with acceptable simulation times when compared to physical tests. The result difference obtained from the FE-software's in relation to physical crash experiments were considered to be varied but did indicate that shell elements were efficient enough for the specific profile during simulations with LS-Dyna. Impetus AFEA proved that the same time to be numerically efficient for energy approximations with solid elements refined with the third polynomial.
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Книги з теми "Solid finit element":

1

Braess, Dietrich. Finite elements: Theory, fast solvers, and applications in solid mechanics. Cambridge, U.K: Cambridge University Press, 1997.

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2

Lepi, Steven M. Practical guide to finite elements: A solid mechanics approach. New York: Marcel Dekker, 1998.

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3

Gladwell, G. M. L. Nonlinear Solid Mechanics. Dordrecht: Springer Netherlands, 2009.

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4

Berlioz, Alain. Solid mechanics using the finite element method. London: ISTE, 2009.

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5

Berlioz, Alain. Solid mechanics using the finite element method. London: ISTE, 2009.

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6

Nicholson, D. W. Finite element analysis: Thermomechanics of solids. 2nd ed. Boca Raton: CRC Press, 2008.

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7

Nicholson, D. W. Finite element analysis: Thermomechanics of solids. 2nd ed. Boca Raton: CRC Press, 2008.

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Nicholson, D. W. Finite element analysis: Thermomechanics of solids. 2nd ed. Boca Raton, FL: CRC Press, 2008.

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9

Gosz, Michael R. Finite element method: Applications in solids, structures, and heat transfer. Boca Raton: Taylor & Francis, 2006.

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10

Zienkiewicz, O. C. The finite element method for solid and structural mechanics. 6th ed. Amsterdam: Elsevier Butterworth-Heinemann, 2005.

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Частини книг з теми "Solid finit element":

1

Humphrey, Jay D. "Finite Elements." In Cardiovascular Solid Mechanics, 211–46. New York, NY: Springer New York, 2002. http://dx.doi.org/10.1007/978-0-387-21576-1_6.

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2

Kuna, Meinhard. "Finite Element Method." In Solid Mechanics and Its Applications, 153–92. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6680-8_4.

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3

Portela, Artur, and Abdellatif Charafi. "Solid Mechanics Applications." In Finite Elements Using Maple, 251–318. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-55936-5_7.

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4

Hartmann, Friedel, and Peter Jahn. "Finite Elements." In Springer Series in Solid and Structural Mechanics, 149–258. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55889-5_3.

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5

Dym, Clive L., and Irving H. Shames. "Finite Element Analysis: Preliminaries and Overview." In Solid Mechanics, 559–89. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6034-3_10.

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Dym, Clive L., and Irving H. Shames. "Finite Element Applications: Trusses and Beams." In Solid Mechanics, 591–633. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6034-3_11.

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Reddy, J. N. "Numerical Methods, Finite Element." In Encyclopedia of Solid Earth Geophysics, 892–95. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8702-7_37.

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Reddy, J. N. "Numerical Methods, Finite Element." In Encyclopedia of Solid Earth Geophysics, 1–4. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-10475-7_37-1.

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Reddy, J. N. "Numerical Methods, Finite Element." In Encyclopedia of Solid Earth Geophysics, 1145–49. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58631-7_37.

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Kattan, Peter I. "The Linear Tetrahedral (Solid) Element." In MATLAB Guide to Finite Elements, 329–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-05209-9_15.

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Тези доповідей конференцій з теми "Solid finit element":

1

Wei, C. Stan, and Clark D. Skinner. "Finite Element Mesh Generation With Computed Tomography Scan Data." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0126.

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Abstract This report presents a new finite element meshing approach, put forth by Q-Mesh, to producing 3-D mesh models for solid objects whose geometries can be captured with an industrial computed tomography (CT) scanner. The Q-Mesh system utilizes a series of deformable grid templates and component solid regions to create a 3-D global mesh that can be divided into subregions of connected meshes located within the component solids. It provides an interactive graphics interface through which the user can design and visualize 3-D, multiregion meshes consisting of well-formed wedge and hexahedron elements. The unique solid-modeling algorithm implemented in Q-Mesh allows the system to generate, automatically, matching finite element meshes across any number of solid regions. This unique feature makes Q-Mesh an ideal mesh generator for finite element solvers geared to the simulation of general multiregion problems. Furthermore, the use of a multiregion mesh model as the source for analysis models representing variations of a single-region mesh, as unions of selected subregions, has proven more time efficient and cost effective than the single-region alternative where each variational model has to be regenerated from scratch. This report focuses on the utility of a CT scanner as a geometry input processor to Q-Mesh. The generation of finite element models for a solid object represented in the form of sliced CT scan data involves two phases: (1) converting the sliced CT scan data into a series of stacked solids; and (2) utilizing Q-Mesh’s interactive design tools to build mesh models based on the reconstructed solids. A number of examples are given to demonstrate the general procedure and unique capabilities of the new meshing approach.
2

Bjorkman, Gordon S., and Jason M. Piotter. "Finite Element Mesh Considerations for Reduced Integration Elements." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61135.

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Finite element models of spent fuel casks and canisters that are typically used in impact and impulse analyses may contain tens of thousands of nonlinear elements. These models use explicit time integration methods with small time steps. To achieve reasonable run times, fully integrated elements are replaced with under-integrated elements that use reduced integration procedures. When fully integrated these elements produce a linear strain distribution. Reduced integration, however, results in a constant strain distribution, which requires more elements through the thickness of the canister shell to achieve the same accuracy as fully integrated elements. This paper studies the effect of the number of reduced integration elements through the thickness of the canister shell and the ratio of element height to shell thickness on the accuracy of the strains in regions of high through-thickness bending, such as the junction between the shell and base plate. It is concluded that mesh refinement has a significant effect on the maximum plastic strain response in such regions and that a converged solution may not be attainable within practical limits of mesh refinement, if the results are based solely on the maximum plastic strain on a cross section at a structural discontinuity. The objective is not to chase the stress concentration with ever finer meshes, but rather the objective is to establish a mesh density within the discontinuity region that results in the stresses and strains that are associated with the bending moment that restores compatibility at the structural discontinuity. In this case a converged solution is obtained by investigating the response of other elements on the same cross section that are not located on the surface of the stress concentration at the structural discontinuity. Based on the results, a “rule of thumb” is proposed for mesh refinement in a region of severe structural discontinuity wherein reasonably proportioned reduced integration solid elements are used and plastic strains are evaluated.
3

Xu, F., P. Sofronis, N. Aravas, A. Namazifard, and R. Fiedler. "Finite Element Modeling of Porous Solid Propellants." In 41st AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2005. http://dx.doi.org/10.2514/6.2005-4349.

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4

Medyanik, S., N. Vlahopoulos, and S. Lee. "Energy Finite Element Analysis of Structural-Solid Domains." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62400.

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An Energy Finite Element Analysis (EFEA) formulation and implementation for modeling coupled structural-solid domains is presented. Two wave bearing mechanisms are considered within the solid domain, associated with dilatational and distortional deformation. The corresponding space averaged energy densities of these waves comprise the primary variables in the differential equations which are being solved numerically using a finite element approach. Joints are developed between solid elements and the plate elements that facilitate the exchange of power between elements from different wave bearing domains. The power transfer mechanism between each wave type of the solid domain and the bending behavior of the plate is considered separately. The corresponding power transfer coefficients are derived based on a radiation efficiency model between the bending waves of the plate and each one of the waves in the solid domain. Results are validated by comparison to traditional FEA solution, which reveals good agreement between the two approaches. This development targets analysis of tubular members which are filled with solid type of material and would allow for determining the appropriate properties of the solid material that can increase the attenuation of vibration in the tubular members.
5

Wang, Zhaofeng, Guohong You, Qinghui Wu, and Ying Tian. "Finite element analysis of liquid-solid coupling problem." In 2017 29th Chinese Control And Decision Conference (CCDC). IEEE, 2017. http://dx.doi.org/10.1109/ccdc.2017.7978234.

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6

Wohlmuth, Matthias, Konrad Altmann, and Christoph Pflaum. "Finite element simulation of solid state laser resonators." In SPIE LASE: Lasers and Applications in Science and Engineering, edited by Alexis V. Kudryashov, Alan H. Paxton, Vladimir S. Ilchenko, and Lutz Aschke. SPIE, 2009. http://dx.doi.org/10.1117/12.808121.

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7

Date, Hiroaki, Satoshi Kanai, Takeshi Kishinami, Ichiro Nishigaki, and Takayuki Dohi. "Multiresolution Finite Element Mesh Generation." In ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/detc2004-57663.

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Effective and robust automatic generation methods of finite element mesh of product model are required for CAE. Although many researches for them have been done, robust mesh generation for complex solid shapes with small features and flexible mesh property control are still difficult in current finite element meshers. In this paper, we propose a new method for automatic finite element mesh generation of a product model based on multiresolution representation of high-density mesh which are stably generated by existing finite element meshers. In our approach, geometrical and topological mesh properties required for FEA can be controlled using user-specified parameters, and mesh elements corresponding to the solid model elements used for setting the analysis conditions are preserved on the simplified meshes. Using our method, robust finite element mesh generation where the mesh property is controllable could be realized.
8

Bauchau, Olivier A., and Minghe Shan. "Finite Element Models for Flexible Cosserat Solids." In ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/detc2020-22134.

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Abstract The application of the finite element method to the modeling of Cosserat solids is investigated in detail. In two- and three-dimensional elasticity problems, the nodal unknowns are the components of the displacement vector, which form a linear field. In contrast, when dealing with Cosserat solids, the nodal unknowns form the special Euclidean group SE(3), a nonlinear manifold. This observation has numerous implications on the implementation of the finite element method and raises numerous questions: (1) What is the most suitable representation of this nonlinear manifold? (2) How is it interpolated over one element? (3) How is the associated strain field interpolated? (4) What is the most efficient way to obtain the discrete equations of motion? All these questions are, of course intertwined. This paper shows that reliable schemes are available for the interpolation of the motion and curvature fields. The interpolated fields depend on relative nodal motions only, and hence, are both objective and tensorial. Because these schemes depend on relative nodal motions only, only local parameterization is required, thereby avoiding the occurrence of singularities. For Cosserat solids, it is preferable to perform the discretization operation first, followed by the variation operation. This approach leads to considerable computation efficiency and simplicity.
9

Lee, Min-Cheol, Sang-Hyun Sim, Jae-Gun Eom, Man-Soo Joun, and Wan-Jin Chung. "Finite Element Predictions for a Cold Sheet Metal Forming Process Using Tetrahedral Mini-Elements." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50156.

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In this paper, finite element prediction of a cold sheet metal forming process is investigated using solid elements. A three-dimensional rigid-plastic finite element method with conventional linear tetrahedral MINI-elements [1, 2] is employed. This technique has traditionally been used for bulk metal forming simulations. Both single- and double-layer finite element mesh systems are studied, with particular attention to their effect on the deformed shape of the workpiece and thickness variation. The procedure is applied to the well-known problem of the NUMISHEET93 international benchmark. The resulting predictions are compared with experimental observations found in the literature, and good agreement is noted.
10

Prabhakar, Gautam, Akshit Peer, Ajeet Kumar, and Vipul Rastogi. "Finite element analysis of solid-core photonic crystal fiber." In 2012 Students Conference on Engineering and Systems (SCES). IEEE, 2012. http://dx.doi.org/10.1109/sces.2012.6199068.

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Звіти організацій з теми "Solid finit element":

1

Chavez, P. F. Solid modeling requirements for finite element modeling using mapped mesh techniques. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6438118.

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2

Laursen, T. A., S. W. Attaway, and R. I. Zadoks. SEACAS Theory Manuals: Part III. Finite Element Analysis in Nonlinear Solid Mechanics. Office of Scientific and Technical Information (OSTI), March 1999. http://dx.doi.org/10.2172/4711.

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Belytschko, T., K. Mish, N. Moes, and C. Parimi. Structured Extended Finite Element Methods of Solids Defined by Implicit Surfaces. Office of Scientific and Technical Information (OSTI), November 2002. http://dx.doi.org/10.2172/15004927.

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Key, S. W., M. S. Heinstein, C. M. Stone, F. J. Mello, M. L. Blanford, and K. G. Budge. A suitable low-order, eight-node tetrahedral finite element for solids. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/654179.

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Whiteman, J. R. Use and Analysis of Finite Element Methods for Problems of Solid Mechanics and Fracture. Fort Belvoir, VA: Defense Technical Information Center, January 1993. http://dx.doi.org/10.21236/ada261574.

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Maker, B. N. A nonlinear, implicit, three-dimensional finite element code for solid and structural mechanics - User`s Manual. Office of Scientific and Technical Information (OSTI), April 1995. http://dx.doi.org/10.2172/110704.

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Hoover, C., A. DeGroot, and R. Sherwood. Paradyn a parallel nonlinear, explicit, three-dimensional finite-element code for solid and structural mechanics user manual. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/15004769.

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Whirley, R. G., and B. E. Engelmann. DYNA3D: A nonlinear, explicit, three-dimensional finite element code for solid and structural mechanics, User manual. Revision 1. Office of Scientific and Technical Information (OSTI), November 1993. http://dx.doi.org/10.2172/10139227.

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Puso, M., B. Maker, R. Ferencz, and J. Hallquist. NIKE3D a nonlinear, implicit, three-dimensional finite element code for solid and structural mechanics user's manual update summary. Office of Scientific and Technical Information (OSTI), March 2000. http://dx.doi.org/10.2172/15004757.

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Stone, C. M. SANTOS - a two-dimensional finite element program for the quasistatic, large deformation, inelastic response of solids. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/508138.

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