Propriétés mécaniques et modélisation multiéchelle de l'effet de taille dans les polycristaux nanométriques

Abstract : The yield stress of crystalline materials depends on the grain size accordhg to the Hall-Petch relationship. In this work, a multi scale modeling of the effect of size using the generalized self-cbnsistent method will be presented in order to predict the viscoplastic behavior of nanocrystalline materials. In our step, one,models the supposed active mechanisms separately in the nanomatenals. in the models thus worked out, inclusion iegresents the grain core and the matrix represents the grain boundaries and triple junctions. Various approaches will be discussed and studied in order to mode1 the abnormal behavior of the nanocrystalline materials. 'We will study the dislocation glide mechanism as well as Coble creep the emission and penetration mechanism of dislocations by the grain boundaries and finally the grain boundaries sliding mechanism where the interface grain corelgrain boundary plays a considerable part of the slip which can generate the damage of the interface by stick-slip mechanism
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Sâd Benkassem. Propriétés mécaniques et modélisation multiéchelle de l'effet de taille dans les polycristaux nanométriques. Autre. Université Paul Verlaine - Metz, 2007. Français. ⟨NNT : 2007METZ029S⟩. ⟨tel-01749029⟩

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