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Une amélioration de la description du phénomène de déformation progressive dans les métaux par la prise en compte de la distorsion du domaine d'élasticité

Abstract : If a metal is submitted to cyclic loading under a non-zero mean stress, plastic strain may accumulate, generally in the direction of mean stress, over the cycles: this is rachetting.
The background of the Ph.D. Thesis was the improvement of the description of this phenomenon un metallic structures. Towards this end, we have chosen to focus our attention on the phenomenological macroscopic models that describe material behaviour in structural computations.
As suggested in several articles, one way of improvement was to take into account yield surface distortion, a phenomenon many times observed experimentally but neglected up to now for simplicity. In order to introduce properly this new element into the modelization, we have used a dialogue between a micro-macro model (more relevant from a physical point of view but also more CPU time consumer) and the macroscopic model to build. We have taken advantage of the informations given by the micro-macro model to build a macroscopic model that can describe multiaxial ratchetting as well as the yield surface distortions predicted by the micro-macro model, over a large base of "virtual tests". Then, the model thus developped has been successfully identified and validated on several complex experimental results obtained on the volume element of a real material. A final validation of the model on a non homogeneous (structural) test is under investigation.
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https://tel.archives-ouvertes.fr/tel-00003892
Contributor : Ludovic Vincent <>
Submitted on : Friday, December 5, 2003 - 12:34:57 PM
Last modification on : Monday, February 15, 2021 - 10:42:00 AM
Long-term archiving on: : Friday, April 2, 2010 - 7:50:16 PM

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  • HAL Id : tel-00003892, version 1

Citation

Ludovic Vincent. Une amélioration de la description du phénomène de déformation progressive dans les métaux par la prise en compte de la distorsion du domaine d'élasticité. Matériaux. École normale supérieure de Cachan - ENS Cachan, 2002. Français. ⟨tel-00003892⟩

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