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Academic literature on the topic 'Comportement élastoplastique'
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Journal articles on the topic "Comportement élastoplastique"
Maghous, Samir, Patrick de Buhan, Luc Dormieux, and Denis Garnier. "Comportement élastoplastique homogeneisé d'un milieu rocheux fracture." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 328, no. 10 (October 2000): 701–8. http://dx.doi.org/10.1016/s1620-7742(00)01257-5.
Full textTouzot, Gilbert, and Jaouad Dabounou. "Intégration numérique de lois de comportement élastoplastique." Revue Européenne des Éléments Finis 2, no. 4 (January 1993): 465–94. http://dx.doi.org/10.1080/12506559.1993.10511093.
Full textBoudaia, El Hassan, Lahbib Bousshine, Ali Chaaba, Hicham Fihri Fassi, and Gery De Saxcé. "Analyse par éléments-finis tridimensionnelle du comportement élastoplastique avec contact frottant." Mécanique & Industries 10, no. 6 (November 2009): 487–501. http://dx.doi.org/10.1051/meca/2010008.
Full textBoubakar, M. Lamine, and Philippe Boisse. "Comportement élastoplastique anisotrope pour l'analyse numérique des coques minces en grandes transformations." Revue Européenne des Éléments Finis 7, no. 6 (January 1998): 709–35. http://dx.doi.org/10.1080/12506559.1998.10511333.
Full textJendoubi, K., N. Ranganathan, and T. Bui-Quoc. "Alliage d’aluminium à haute résistance 2024-T351. Comportement plastique et élastoplastique en bout de fissure." Matériaux & Techniques 79, no. 1-2 (1991): 5–12. http://dx.doi.org/10.1051/mattech/199179010005.
Full textHaloui, M., H. P. Lieurade, A. Rigolot, and A. Bonnard. "Étude expérimentale et analyse élastoplastique du comportement de joints de colle sous sollicitation monotone et cyclique." Matériaux & Techniques 80, no. 4-5 (1992): 45–53. http://dx.doi.org/10.1051/mattech/199280040045.
Full textBerveiller, Marcel, Joseph Morreale, and Eric Reubrez. "Comportement élastoplastique des aciers lors de la mise en forme: théorie micromécanique, simulations numériques et résultats expérimentaux." Revue Européenne des Éléments Finis 3, no. 4 (January 1994): 491–514. http://dx.doi.org/10.1080/12506559.1994.10511146.
Full textEstevez, R., and P. Franciosi. "Etude théorique et expérimentale du comportement élastoplastique d’un superalliage base nickel à 650 °C. Prise en compte de la nature biphasée." Revue de Métallurgie 91, no. 9 (September 1994): 1340. http://dx.doi.org/10.1051/metal/199491091340.
Full textJuanicotena, A., and F. Llorca. "Contribution du test d'expansion d'anneaux à l'étude de différentes lois de comportement élastoplastique dans le domaine des grandes vitesses de déformation. Application au cuivre et à l'acier Mars 190." Le Journal de Physique IV 07, no. C3 (August 1997): C3–541—C3–546. http://dx.doi.org/10.1051/jp4:1997393.
Full textKoulani, Abdelmajid El, and Alain Léger. "Comportement post-critique des poutres élastoplastiques: existence et régularité des branches bifurquées." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 324, no. 11 (June 1997): 1307–13. http://dx.doi.org/10.1016/s0764-4442(99)80418-2.
Full textDissertations / Theses on the topic "Comportement élastoplastique"
Montoya, Dominique. "Comportement élastoplastique d'une nuance de béryllium." Paris 13, 1991. http://www.theses.fr/1991PA132010.
Full textEvrard, Pierre. "Modélisation polycristalline du comportement élastoplastique d'un acier inoxydable austéno-ferritique." Phd thesis, Ecole Centrale de Lille, 2008. http://tel.archives-ouvertes.fr/tel-00316073.
Full textDeux modèles de la littérature sont étendus à l'acier duplex. Les comportements des grains austénitiques et ferritiques sont décrits via des lois de plasticité cristallines. L'identification des paramètres matériau ne demande que deux essais mécaniques simples et des données de la littérature. Les modèles proposés rendent bien compte des premières boucles d'hystérésis d'essais de traction-compression/torsion non-proportionnels et de l'évolution des surfaces de plasticité.
Puis, l'adoucissement cyclique a été expliqué à partir d'analyses MET. Celles-ci ont montré que les deux phases participent à l'adoucissement cyclique. Cependant, dans une première approche, seul le réarrangement des dislocations en zones dures et molles dans les grains ferritiques a été modélisé. Les résultats montrent que le nouveau modèle prédit bien le durcissement et l'adoucissement cyclique, et les boucles d'hytérésis au cycle stabilisé.
Enfin, les champs cinématiques issus d'un calcul de microstructure ont été comparés à ceux mesurés (El Bartali07). Une bonne concordance est observée suite à un trajet de traction monotone, l'écart est plus important pour un trajet de traction-compression.
Evrard, Pierre. "Modélisation polycristalline du comportement élastoplastique d’un acier inoxydable austéno-ferritique." Ecole Centrale de Lille, 2008. http://tel.archives-ouvertes.fr/docs/00/31/60/73/PDF/These_Evrard.pdf.
Full textUntil now, the plastic behaviour of an austenitic-ferritic stainless steel (DSS) has been modelled using phenomenological models. Unfortunately, these models do not take into account the biphased character of the material, and the polycrystalline character of each phase. Furthermore, a large experimental data base is necessary in order to identify model parameters. These results motivated the development of a biphased polycrystalline model. Two models are used and extended in order to take into account both polycrystalline phases. A single crystal law describes each austenitic and ferritic phase. Model parameter identification needs only two simple tests and literature results. Both models predict correctly the first hysteresis loops for a tension-compression/torsion test and the yield surface evolution. Then, the cyclic softening is explained from transmission electronic microscopy analyses. It is observed that both phases contribute to cyclic softening. However, in a first approach, only the rearrangement of dislocations in hard and soft zones in ferritic grains is modelled. The results show that the new model predicts well cyclic hardening and softening and the stabilized hysteresis loops for uniaxial and biaxial non-proportional cyclic loading. Finally, kinematic fields obtained by a microstructure computation are compared to the experimental ones. After a monotonic tension test, a good agreement is obtained between simulated and experimental kinematic fields, which is not the case after a tension-compression test
Etienne, André-Michel. "Modélisation par éléments finis en comportement élastoplastique de multicouches céramo-métalliques." Toulouse, INPT, 1991. http://www.theses.fr/1991INPT045G.
Full textStochioiu, Constantin. "Contribution à l’étude du comportement visco-élastoplastique d’un composite structural lin/époxy." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCK023.
Full textThe study presented in the manuscript is positioned in a large context of development of new materials, with a reduced environmental impact. From the possibilities currently under scrutiny (especially in Europe), flax fiber reinforced composites are the most promising. Thanks to their low density and high mechanical properties, as well as their low energy costs, fuel the idea of their usage in structural composites, by replacing glass fibers. These biocomposites are already implemented in numerous applications. However, several scientifical and technical unknowns, especially their long-term behavior, are hindering their use in domains of high load conditions.The thesis proposes to study the time dependent behavior of unidirectional reinforced composites, on the fiber direction. Even though it is largely accepted that the material behavior is viscoelastic and viscoplastic, few studies are dedicated to its analysis.Thus, multi cycled creep/recovery tests with variable creep stress and durations have allowed to determine the behavior’s dependence on stress and time. These tests have also allowed to determine the existence of a stress limit for plastic deformation appearance. They have been associated with the viscoplastic behavior.The results have, afterwards, allowed to propose a behavior law, composed of Schapery’s model for non-linear viscoelasticity and Zapas-Crissman’s model for viscoplasticity. The law parameters have been identified with the help of the creep/recovery tests. The model is capable of predicting the material response in deformation for creep recovery tests as well as load/unload tests. Simulations have also shown the model’s capability to reproduce traction tests with different loading speeds and to reproduce the nonlinear behavior specific to these composite materials
Belkhabbaz, Abderrahim. "Contribution à l'étude du comportement élastoplastique d'agrégats polycristallins par homogénéisation numérique FFT." Paris 13, 2013. http://www.theses.fr/2013PA132002.
Full textZhang, Yan. "Modélisation du comportement élastoplastique d'une pâte cimentaire soumise à la dégradation chimique." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10005/document.
Full textThesis presents elastoplastic modelling of cement-based materials coupledwith chemical degradation and mechanical damage. The emphasis is put on cementpaste subjected to compressive stresses. A short literature review is first presented on the mineralogical composition, chemical degradation mechanisms, basic mechanical behaviour and chemical-mechanical coupling. Based on this analyses and a series of experimental data obtained from uncoupled and coupled tests, an elastoplastic constitutive model coupled with chemical damage is first formulated. Two plastic mechanisms are taken into account; respectivelyrelated to deviatoric shearing and pore collapse. The chemical damage is identified as relative variation of porosity. Elastic and plastic properties are affected by chemical damage. Numerical simulations are compared with experimental data and good agreements have been obtained. The evolution of the chemical damage has been described by the generalized diffusion equation which is based on the mass balance equation and a phenomenological chemistry model. We have used finite element method to solve the generalized diffusion equation. Coupled chemical-mechanical tests have been simulated by the proposed model and we have also obtained satisfactory concordance. An extension of the model is finally proposed by including mechanical damage due to microcracks in order to describe brittle responses of material under tensile stresses and low confining pressures. An example of application to structural analysis with chemical degradation is presented. It has been shown that the proposed model describes correctly the main features of the mechanical behaviours of cement-based materials at different stress conditions with chemical degradation
Ningre, Corado. "Modélisation du comportement élastoplastique cyclique multiaxial par une approche multisurface dans l'espace des déformations." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI053.
Full textThis work deals with the theoretical, numerical and experimental study of the elastoplastic mechanical behavior of metallic materials in complex multiaxial cyclic loadings. The elastoplastic behavior is described by a multisurface model, within the finite strain theory. This model is written in the five-dimensional Ilyushin strain space. The resulting model is capable of describing the multiaxial behavior of metallic materials, in complex cyclic loadings, in particular non-proportional, taking into account finite strain, time-independent irreversibility, cumulative second order effects (Poynting-Swift effect) and cyclic hardening. The model has been implemented in a commercial finite element calculation code, in order to produce an operational tool for calculating structures such as mechanical equipment and internal components of hydroelectric power plants (turbines, alternators, etc.). The proposed model was validated by comparison with combined tensile-torsion biaxial test results obtained on stainless steel. This model has been completed by an energy and thermodynamic analysis that allows the implementation of a relevant energy approach for the monitoring of fatigue damage. As part of this work, this approach was illustrated by the proposal of a fatigue criterion, validated by the comparison of its predictions with those of other classical fatigue criteria proposed in the literature
Langlois, Laurent. "Évolutions propres de la microstructure de dislocations et conséquences sur le comportement élastoplastique des métaux." Metz, 2000. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2000/Langlois.Laurent.SMZ0023.pdf.
Full textNguyen, Huy Gia. "Approche micromécanique pour la modélisation du comportement élastoplastique des composites : applications aux mortiers de résine." Cergy-Pontoise, 2008. http://biblioweb.u-cergy.fr/theses/08CERG0388.pdf.
Full textThis work presents an homogenization model to simulate the elastoplastic behavior of resin mortars. The influence of the geometry and the spatial orientations of aggregates was introduced as well as the presence of porosity. In the elastic phase, comparisons between simulations and experimental results (ultrasonic wave propagation method) show that the model provides satisfactory predictions of the behaviors of epoxy resin-based mortars. In plastic phase, the equivalent behavior has been implemented using the tangent modulus approach and an isotropic approximation of the matrix tensor rigidities was build in order to compute the Eshelby tensor. Isotropic and kinematics hardening laws have been implemented. In order to validate the model, tests were performed on organic matrix composites and short reinforcements. Comparisons were also made with results from the literature on metal matrix composites. The proposed modeling adequately predicts the overall experimental results