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Статті в журналах з теми "Méthode des éléments finis (FEM)":
Hage-Ali, S., M. Oudich, J. Claudel, J. Strèque, E. Tisserand, J. Mainka, D. Rouxel, et al. "Microsystèmes communicants : modélisation, fabrication et mesures." J3eA 18 (2019): 1007. http://dx.doi.org/10.1051/j3ea/20191007.
Yazid, Abdelaziz. "Une approche numérique de la résistance à la fissuration d’un composite fibreux par la méthode des éléments finis étendus X-FEM." Revue des composites et des matériaux avancés 23, no. 2 (August 31, 2013): 208–18. http://dx.doi.org/10.3166/rcma.23.205-218.
Auvinet, G., R. Mellah, F. Masrouri, and J. F. Rodriguez. "La méthode des éléments finis stochastiques en géotechnique." Revue Française de Géotechnique, no. 93 (2000): 67–79. http://dx.doi.org/10.1051/geotech/2000093067.
Demesy, Guillaume, André Nicolet, Frédéric Zolla, and Christophe Geuzaine. "Modélisation par la méthode des éléments finis avec onelab." Photoniques, no. 100 (January 2020): 40–45. http://dx.doi.org/10.1051/photon/202010040.
Laurent-Gengoux, P., and D. Neveu. "Calcul des singularités par la méthode des éléments finis." ESAIM: Mathematical Modelling and Numerical Analysis 24, no. 1 (1990): 85–101. http://dx.doi.org/10.1051/m2an/1990240100851.
Moës, Nicolas, and Ted Belytschko. "X-FEM, de nouvelles frontières pour les éléments finis." Revue Européenne des Éléments Finis 11, no. 2-4 (January 2002): 305–18. http://dx.doi.org/10.3166/reef.11.305-318.
Savoldelli, C., Y. Tillier, P. O. Bouchard, and G. Odin. "Apport de la méthode des éléments finis en chirurgie maxillofaciale." Revue de Stomatologie et de Chirurgie Maxillo-faciale 110, no. 1 (February 2009): 27–33. http://dx.doi.org/10.1016/j.stomax.2008.10.001.
Bonnet, de Marc, and Attilio Frangi. "Analyse des solides déformables par la méthode des éléments finis." European Journal of Computational Mechanics 16, no. 5 (January 2007): 667–68. http://dx.doi.org/10.1080/17797179.2007.9737308.
Bou-Saïd, Benyebka. "La méthode des éléments finis en lubrification Une revue bibliographique." Revue Européenne des Éléments Finis 10, no. 6-7 (January 2001): 637–52. http://dx.doi.org/10.1080/12506559.2001.9737564.
Lozinski, Alexei, Zoubida Mghazli, and Khallih Ould Ahmed Ould Blal. "Méthode des éléments finis multi-échelles pour le problème de Stokes." Comptes Rendus Mathematique 351, no. 7-8 (April 2013): 271–75. http://dx.doi.org/10.1016/j.crma.2013.04.010.
Дисертації з теми "Méthode des éléments finis (FEM)":
Dréau, Kristell. "Méthode X-FEM à ordre élevé : influence de la représentation géométrique." Ecole centrale de Nantes, 2010. http://www.theses.fr/2010ECDN0043.
Mesh generation of complex geometries can be very time-consuming, within a classical finite element analysis. The main difficulty arises from the necessity of the mesh to conform to physical surfaces. Discontinuities such as holes, cracks and material interfaces may not cross mesh elements. Moreover, local refinements close to discontinuities and mesh modifi-cation to track the geometrical and topological changes in crack propagation problems for example, can be difficult. Also, when geometries evolve and history dependent models are used, robust methods to transfer the solution to the new mesh are needed. The eXtended Finite Element Method (X-FEM) was developed in order to get rid of mesh difficulties. Within the X-FEM, surfaces that are not represented explicitly by mesh boundaries can be implicitly represented by the iso-zero values of a level-set function. The finite element approximation is then enriched by additional functions to represent the local behavior of the material around discontinuities. Nowadays, X-FEM is almost used with linear shape functions and a linear representa-tion of the geometry across elements. This work deals with high order X-FEM when domains present curved boundaries. The influence of the geometrical representation of these discon-tinuities is studied with examples including free surfaces, cracks, and material interfaces in linear elasticity. New enrichment functions are proposed to accurately represent material behavior in elements cross by curved discontinuities
Geniaut, Samuel. "Approche X-FEM pour la fissuration sous contact des structures industrielles." Nantes, 2006. http://www.theses.fr/2006NANT2114.
Industrial surveys have shown that mesh-based approaches are unable to treat helix-shape cracks problems in shafts. Problems with various 3D cracks cannot be meshed with automatic meshing. A new approach allows one to introduce cracks in a very simple mesh. With the extended finite element method (X-FEM), the mesh doesn’t necessarily follow the crack geometry, and the framework of the finite element method is kept. This method uses the partition of unity to enrich the classical shape functions basis, with a jump and asymptotic functions. Besides, the use of the level sets method makes the representation of 3D cracks very handy. To take into account the possibility of a crack closure, a method for treating the contact effects has been adapted to the X-FEM framework, based on a Lagrangian Augmented formulation. Besides, one of the main features of contact with X-FEM is that under small displacements assumptions, no contact-nodes searching algorithm is needed, because a geometrical point of the surface can be seen as two physical points, one on each side of the surface. Therefore the displacement jump is expressed in terms of enriched degrees of freedom introduced by X-FEM. The formulation has been stabilized, in order to respect a compatibility condition (LBB condition) between the approximation spaces of the displacement and contact fields. This formulation has been implemented within a general-purpose finite element code, Code_Aster, developed by EDF
Allais, Raphaël. "Développement de deux estimateurs d'erreur à posteriori pour la méthode X-FEM." Ecole centrale de Nantes, 2012. http://www.theses.fr/2012ECDN0053.
The extended finite element method (X-FEM) is now commonly used in industrial finite element codes in order to get rid of meshing constraints. This contribution concerns the use of the X-FEM in the context of adaptive meshing. This class of approach allows to define automatically optimal mesh densities in order to complie with a target error level. These stratégies involve two main aspects : (i) the estimation of the approximation error introduced by the numerical method and (ii) mesh adaptation in the high error areas. This contribution focus on the adaptation and validation of these two aspects in the context of the X-FEM for stationary hear equation problems. Two residual-based estimators are considered. The first one is based on the hierarchical bases approach. Unfortunately, it is computationaly costly. The second one is based on a flux-free patch estimator. The performances of these estimators are assessed on various representative numerical examples (free surfaces, material interfaces and singular problems). Finally, the use of octree-based stratégies are considered for mesh adaptation : these approaches are well adapted to the X-FEM, as non conforming meshes are allowed. However, the method introduce so called hanging nodes between adjacent elements. An enrichment strategy is proposed for these nodes, so that the condinuity of the field is ensured
Legrain, Grégory. "Extension de l'approche X-FEM aux grandes transformations pour la fissuration des milieux hyperélastiques." Nantes, 2006. http://www.theses.fr/2006NANT2127.
Rubber-like materials are used in a wide range of applications (from basic to high-tech one). Failure of rubbers is mainly caused by rupture because of cracks: In a first step, mechanical solicitations and external atmosphere make the crack initiate. Then, under mechanical loading, it propagates until the part breaks. The main subject of this work is to facilitate the numerical simulation of crack propagation in rubber-like materials. The eXtended Finite Element Method (X-FEM), which was developed as a mean to reduce remeshing in linear fracture mechanics is used here. Moreover, the method allows the enrichment of the finite element approximation with physical based functions. The first part of this work consists in an application of the X-FEM in the field of nonlinear fracture mechanics. In particular, we insist on the choice of a well fitted formulation for resolution, and on the use of adapted enrichment functions. In a second part, we focus on the enrichment of mixed formulations under incompressibility constraint. Strategies have been developed in order to preserve the stability of the formulations. These enrichments allow the fulfilment of the inf-sup condition in the case of holes, material inclusions and cracks under the small strain assumption. Finally, in a last part, we focus on the application of the configurational forces concept as a criterion for crack propagation in both 2D and 3D
Nguyen, Dang Huy. "Contribution à la modélisation et à la caractérisation du comportement des assemblages brasés : couplage des méthodes DAR et X-FEM." Toulouse 3, 2009. http://thesesups.ups-tlse.fr/1015/.
Laminar assembly by the means of the brazing process is becoming widely used in the field of rapid tooling used for die casting, plastic injection moulding. . . In most applications, the brazed assembly must withstand the in-service mechanical and thermal solicitations. This research is a contribution to the modelling and the characterisation of the behaviour of brazed assembly in both mechanical and thermal aspects. The deficiencies of the classical modelling methods when modelling of a complex structure with localised variations is concerned led us to search for a new method to treat the problems of brazed assemblies. Considering the presence of the joint in the assembly as a perturbation in a broad structure, we have proposed the coupling of two methods: the matched asymptotic expansions method (DAR) and the extended finite element method (X-FEM). The construction of the enriched part of the X-FEM is derived into five variants of enrichment using the perturbation solutions obtained by the DAR method. The basic principles and methods of implementation of the DAR-X-FEM coupling have been presented through the one-dimensional example of brazed assembly. Applying the most appropriate variant of enrichment, the DAR-X-FEM coupling was subsequently extended to the two-dimensional case of brazed assemblies. The illustration of coupling DAR-X-FEM 2D was performed for two problems: heat transfer and mechanical loading. To better understand the behaviour of brazed assembly and to validate the results obtained by the coupling DAR-X-FEM, an experimental study has been presented. Firstly, high temperature brazing tests have been carried out. Secondly, the brazed specimens were tested to characterize both mechanical and thermal properties. Lastly, the comparison between the experimental and the simulation results confirmed all the interest of the proposed coupling DAR-X-FEM
Dufrène, Laurent. "Modélisation numérique du soudage par faisceau d'électrons par une méthode éléments finis." Aix-Marseille 1, 1994. http://www.theses.fr/1994AIX11027.
Rannou, Johann. "Prise en compte d'effets d'échelle en mécanique de la rupture tridimmensionnelle par une approche X-FEM multigrille localisée non-linéaire." Lyon, INSA, 2008. http://theses.insa-lyon.fr/publication/2008ISAL0055/these.pdf.
The eXtended Finite Element Method (X-FEM) and multigrip techniques are coupled to obtain a general numerical tool allowing for study of three-dimensional multiscale fracture mechanics problem. The scales ranging from the scale of the whole structure to those of the crack (that can differ from several order of magnitude) can be handled efficiently within the local multigrip framework. Specific improvements to the stress intensity factors computation and level sets definition and propagation are also provided. This numerical tool is applied to model 3-D fatigue crack propagation in an aluminium alloy. Comparisons with experimental data coming from X-ray microtomography experiments are provided (MATEIS and Propavanfis collaboration)
Hammood, Mohammed Naji. "A Meso-Macro Numerical Approach for Chloride Diffusivity Modeling Taking into Account Chloride Binding and Crack Evolution in Concrete." Thesis, Nantes, 2017. http://www.theses.fr/2017NANT4066/document.
The penetration of chloride ions has an essential responsibility in the degradation of concrete structures caused by reinforcement corrosion leading to a severe impact on the durability and service life of concrete structures. The problem becomes more critical with the existence of cracking which accelerate the penetration of chloride ions into concrete cover. In this work, the FE formulation for the numerical modelling of chloride ions diffusion accounting for chloride binding capacity in mesoscale concrete is introduced. The mesostructure is based on a twophase 3D representation of heterogeneous materials, such as concrete, where stiff aggregates are embedded into a mortar matrix. For this purpose, we turn to the Embedded Finite Element Method (E-FEM). This is performed by introducing a weak discontinuity in the chloride concentration field for finite elements where the physical interface is present. Numerical spatial homogenization experiments based on Pouya’s works are also performed on 3D mesostructures to compute macroscopic diffusivity tensors accounting for two-phase material. Comparison with Maxwell's equation and experimental results are carried out to show the accuracy of the proposed numerical approach. Finally, the meso-macro approach is presented to introduce a numerical model capable of providing macroscopic information (mean diffusivity tensor) integrating the level of crack opening, crack path and heterogeneity of materials in quasi-brittle concrete. The mesoscale coupling with the mass transport part is based on Fick’s Law with a modified diffusion coefficient taking into account crack opening and aggregates. The macroscopic diffusivity tensor integrates more complex features such as the cracking evolution process, tortuosity of the crack’s path, inducedanisotropy and presence of aggregates. The defined tensor is used afterwards in order to estimate the service-life of concrete structures, including the effect of the cracking and the internal mesostructure
Yaseri, Alireza. "Analysis of earth dam-flexible canyon interaction by 3D hybrid FEM-SBFEM." Doctoral thesis, Université Laval, 2021. http://hdl.handle.net/20.500.11794/70281.
The canyon surrounding a dam can be assumed as an unbounded domain, and the geometry and flexibility of a canyon are parameters that greatly affect the values of natural periods in earth dams. In this thesis, in order to take into account these two effects, canyons are modeled by SBFEM, and earth dams, which have limited geometries, are modeled by FEM. The hybrid FEM-SBFEM technique used for the dynamic three-dimensional analysis of soil-earth dam interactions is validated with results available in the literature. Because the dynamic-stiffness matrix of the unbounded domain is complex and frequency-dependent, the classical mode-superposition method is not straightforward for a soil-structure interaction system, and thus, to obtain their fundamental natural frequencies, the modeled dams were excited in the upstream-downstream direction. The natural periods of earth dams in canyons with different geometries shapes and impedance ratios are obtained, and are found to have significant effects on the dams’ natural periods. The results are compared with actual recorded data, and it is found that the graphs put forward in this study may be used by practical engineers for the estimation of natural periods of earth dams in canyons with different shapes and material properties. Several amplification functions corresponding to different canyon conditions are obtained by applying a uniform displacement at the canyons’ boundaries. A comprehensive study is performed to examine the effects of canyon geometry and flexibility on the steady-state responses of the dams, and it is found that these two effects significantly influence the amplification functions. While the flexibility of the canyon does affect the maximum amplification function value, this value does not change for earth dams in canyons that have different shapes but the same length. In addition, the lateral responses of earth dams in the time domain are computed in order to analyze the aforementioned effects under an actual earthquake. The proposed amplification functions are used to compare the recorded response spectra of the El Infiernillo dam under the two 1966 earthquakes with the calculated amplification function, and a reasonable agreement is observed between them. The equivalent linear method (EQL) is implemented into the FEM, and the FEM-SBFEM technique is extended in order to take into consideration the effect of earth dams’ nonlinear behavior. It is observed that such nonlinear behavior greatly affects the natural frequency, the amplification function, and peak crest acceleration of earth dams located in canyons. The effects of canyon geometry and flexibility on the nonlinear behavior are examined, and it is found that by increasing canyon flexibility, the effect of nonlinearity is decreased. The El Infiernillo dam is modeled by the 3D nonlinear FEM-SBFEM, and comparison of the crest amplification function obtained by the proposed method with the recorded data shows the accuracy of the nonlinear FEM-SBFEM.
Jemal, Ellouze Fatma. "Modélisation du comportement thermomécanique d'un alliage à mémoire de forme à base de fer type Fe-Mn-Si." Thesis, Nancy 1, 2009. http://www.theses.fr/2009NAN10135/document.
It is well known that Shape Memory Alloys (SMA) are a particular class of materials that can recover a memorized shape by simple heating. This remarkable property, called the Shape Memory Effect (SME), can be exploited in the design of original applications in order to find attractive solutions to problems encountered in various industrial fields. We propose a thermo-mechanical three-dimensional constitutive law adapted to Fe-based shape memory alloys. It takes into account the effect of the martensitic transformation and the plastic slip mechanisms and their interaction. The adopted formulation is based on a simplified micromechanical description. The macroscopic behaviour is derived by considering the equivalent homogeneous effect on a representative volume element. The Gibbs free energy expression is defined. Thermodynamic driving forces are then derived and compared to critical forces leading to the constitutive equations solved by Newton–Raphson numerical scheme. Obtained results for thermo-mechanical loadings are compared to experimental ones
Книги з теми "Méthode des éléments finis (FEM)":
Pironneau, Olivier. Méthodes des éléments finis pour les fluides. Paris: Masson, 1988.
Craveur, Jean-Charles. Modélisation par éléments finis: Cours et exercices corrigés. 3rd ed. Paris: Dunod, 2008.
Cazenave, Michel. Méthode des éléments finis: Approche pratique en mécanique des structures. Paris: Dunod, 2010.
Huebner, Kenneth H. The finite element method for engineers. 3rd ed. New York: Wiley, 1995.
Trompette, Philippe. Mécanique des structures par la méthode des éléments finis: Statique et dynamique avec problèmes corrigés. Paris: Masson, 1992.
Anandarajah, A. Computational methods in elasticity and plasticity: Solids and porous media. New York: Springer, 2010.
Silvester, P. P. Finite elements for electrical engineers. 3rd ed. New York: Cambridge University Press, 1996.
Huang, Hou-Cheng. Finite element analysis of non-Newtonian flow: Theory and software. London: Springer, 1999.
Jing, Lanru. Fundamentals of discrete element methods for rock engineering: Theory and applications. Amsterdam: Elsevier, 2007.
Silvester, P. Finite elements for electrical engineers. 2nd ed. Cambridge [England]: Cambridge University Press, 1990.
Частини книг з теми "Méthode des éléments finis (FEM)":
Coste, Anne. "Le calcul par la méthode des éléments finis appliqué à la restauration. Une expérience: la cathédrale de Beauvais." In Entre Mécanique et Architecture / Between Mechanics and Architecture, 349–60. Basel: Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-9072-4_20.
Jetteur, Philippe, Michael Bruyneel, and Jean-Charles Craveur. "Chapitre 3. La méthode des éléments finis." In Structures en matériaux composites, 53–81. Dunod, 2019. http://dx.doi.org/10.3917/dunod.bruyn.2019.01.0053.
Cuillière, Jean-Christophe. "9. Application à l’élasticité linéaire." In Introduction à la méthode des éléments finis, 165–238. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0165.
Cuillière, Jean-Christophe. "6. Formulations intégrales." In Introduction à la méthode des éléments finis, 95–117. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0095.
Cuillière, Jean-Christophe. "10. Utilisation pratique de la méthode des éléments finis." In Introduction à la méthode des éléments finis, 239–62. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0239.
Cuillière, Jean-Christophe. "7. Matrices de rigidité locales et vecteurs force locaux." In Introduction à la méthode des éléments finis, 119–30. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0119.
Cuillière, Jean-Christophe. "5. Intégration numérique." In Introduction à la méthode des éléments finis, 77–94. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0077.
Cuillière, Jean-Christophe. "8. Expansion – assemblage – résolution." In Introduction à la méthode des éléments finis, 131–63. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0131.
Cuillière, Jean-Christophe. "2. Rappels." In Introduction à la méthode des éléments finis, 7–28. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0007.
Cuillière, Jean-Christophe. "4. Notions générales et interpolation nodale." In Introduction à la méthode des éléments finis, 37–75. Dunod, 2016. http://dx.doi.org/10.3917/dunod.cuill.2016.01.0037.
Тези доповідей конференцій з теми "Méthode des éléments finis (FEM)":
Hadj SaÏd, M., L. Thollon, Y. Godio-Raboutet, J. H. Catherine, C. M. Chossegros, and D. Tardivo. "Modélisation 3D de l’os maxillaire dans l’analyse par éléments finis en implantologie orale : une nouvelle approche utilisant CBCT et anthropométrie." In 66ème Congrès de la SFCO. Les Ulis, France: EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206603022.
Foray, Pierre, Luisa N. Equihua-Anguiano, and Marc Boulon. "Simulation numérique des ancres à succion en deux et trois dimensions en utilisant la méthode des éléments finis." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2008. http://dx.doi.org/10.5150/jngcgc.2008.069-f.