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Modélisation thermomécanique unifiée des comportements des matériaux à mémoire de forme. Application aux chargements cycliques et à la fatigue.

Abstract : In this paper, we presented a unified and comprehensive model of behavior of shape memory materials and energy criterion for calculating the fatigue of structures operating in pseudo elastic. The model and the test is validated by comparing their predictions with experimental results. Our model has the following advantages: - It is complete, that is to say, it can simulate all the main phenomena behavior characteristics MMF. The simulation uses the same law of behavior and the same set of complementary legislation, which gives it a unified character; - Parameters are easy to identify; - The agreement of predictions with available experimental results is satisfactory; - Given the inclusion of non-proportional loadings, it is possible to perform calculations of structures subjected to loads MMF complex; - The cyclic loading are taken into account. It is therefore possible to determine the steady state of a structure subjected to cyclic phase change in repeated pseudoelastic. In particular, the model calculates the energy dissipated per cycle stabilized at any point of the structure and the energy criterion can then be used to estimate its lifetime. Our work paves the way for a more detailed modeling of the behavior of MMF, which can take into account some often neglected effects, such as formation of R phase, the occurrence of internal loops related expenses partial discharges in pseudoelastic and the asymmetry of behavior in tension and compression. We believe, moreover, it is possible to describe the dynamics MMF through an extension of this model. Experimentally, it would be interesting to apply new technologies to the study of shape memory materials. In this context, infrared thermography seems appropriate to characterize the location of the phase change at certain structures other techniques such as laser material interaction, promise a better description of the kinetics of martensitic transformation. In addition, the problem of fatigue MMF should be further researched. In the short term it is necessary to test the validity of our criterion of life for different types of loading, including torsion, to verify its intrinsic character.
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https://pastel.archives-ouvertes.fr/pastel-00002587
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Submitted on : Wednesday, July 28, 2010 - 11:25:39 AM
Last modification on : Wednesday, July 3, 2019 - 10:48:04 AM
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Wael Zaki. Modélisation thermomécanique unifiée des comportements des matériaux à mémoire de forme. Application aux chargements cycliques et à la fatigue.. Sciences de l'ingénieur [physics]. Ecole Polytechnique X, 2006. Français. ⟨pastel-00002587⟩

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