Contribution à l'étude de la plasticité de transformation dans les mono et polycristaux métalliques

Abstract : This study deals with plasticity caused by martensitic transformation. This phase transition is considered as a mechanism of deformation like plastic slip but controlled by the rate of transformation, sometimes reversible and produced with volume change. Total strain decomposes in three contributions : elastic strain (blocked up and caused by internal stress) ; plasticc strain (dislocation movement) ; intrinsic part produced by the progress of transformation. We ara studying only intrinsic deformation called Perfect Plasticity Transformation. A kinetic study points out the characteristics of this mode of deformation. A thermodynamical approach shows the existence, for single crystal, of a yield fonction analogous to Schmid laws for plastic slip. We demonstrate that the principle of maximal work is valid, so the matrial is standard and we may obtain its flow rule by the means of the yield fonction. These results are extended to the case of polycrystals by a direct but phenomenological approach and by using an homogenization method based on self-consistent scheme. In this last case, the confrontation with experiments shows a good agreement for CuZnAl alloys studied in traction. A first approach of the interaction of perfect transformation plasticity and classical plasticity is proposed for the particular case two-phase brass. A new behaviour is put in evidence : the bimodul effect
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Etienne Patoor. Contribution à l'étude de la plasticité de transformation dans les mono et polycristaux métalliques. Autre. Université Paul Verlaine - Metz, 1986. Français. ⟨NNT : 1986METZ014S⟩. ⟨tel-01775706⟩

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