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Analyse micromécanique de la formation des cellules de dislocations et conséquences sur le comportement des aciers

Abstract : The formation of microstructure of dislocation cells at intragranular level is generaly responsible for physical mechanisms of plastic localisation by shear band. The microstructure induced by prestrain, implicates from a second path, strong internal stresses and complex reactions between dislocations. With hypothesis of scale separation, this work establishes the behavior law of grain to take into account the formation of dislocation cells. The driving forces of plastic strains and cells morphology are obtained by a thermomicromechanical approach describing a volum with discontinuity surfaces of plastic strain. Applied to simplify representation of dislocation microstructure, the introduction of complementary laws translating the effect of non local hardening allows to deduce the elastoplastic behavior of grain. An usual self-consistent transition in elastoplasticity allows to reach the behavior of polycrystal
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Xavier Lemoine. Analyse micromécanique de la formation des cellules de dislocations et conséquences sur le comportement des aciers. Autre. Université Paul Verlaine - Metz, 1995. Français. ⟨NNT : 1995METZ024S⟩. ⟨tel-01777073⟩

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