Influence de l'écrouissage non local et de l'hétérogénéisation intragranulaire sur le comportement des aciers polycristallins

Abstract : Scale transition methods have been developed in order to account for physical mechanisms responsible for plastic deformation in polycrystalline materials, by assuming the intragranular behavior to be uniform (cf the self-consistent scheme). However reality can be different. Indeed a heterogeneous microstructure of dislocations may be induced, corresponding to the intragranular heterogeneization which has drastic consequences on the material anisotropy. The aim of this thesis is to describe such a microstructure in a micromechanical way : this is the nonlocal hardening accounted for in case of a two-phase description of the dislocation cell structure. Then, through a double scale transition, numerous results are presented at micro-, meso- and macroscales, which are closer to experimental data due to the better description of the intragranular behavior
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Denis Muller. Influence de l'écrouissage non local et de l'hétérogénéisation intragranulaire sur le comportement des aciers polycristallins. Autre. Université Paul Verlaine - Metz, 1994. Français. ⟨NNT : 1994METZ026S⟩. ⟨tel-01776104⟩

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