Influences des hétérogénéité élastoplastiques sur les contraintes du deuxième ordre dans les polycristaux métalliques mono- et biphasés : calculs autocohérents - mesures par diffraction X

Abstract : The aim of this work is to study influences of elastoplastic heterogeneities on microscopic stress and strain fields in one - and two phased polycrystals. Local stresses and strains are calculated owing to the self consistant scheme of cinematic integral equation linking local and global strains. Elastic strain calculations allow to show second order stresses and to simulate perfectly X-ray diffraction experiments on isotropic materials and materials with crystallographic and morphologic texture. Parallel calculations and diffraction experiments after tensile plastic déformations show that the model is able to predict residual stresses and their evolution during plastic straining, and their influences on X-ray diffraction experiments. The simple model based on the problem of an inclusion in a matrix allows to explain qualitatively the splitting of X-ray diffraction curves after surface machining in multiphased materials, and to link it to the morphology of the constituents for global homogeneous strains
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Joël Krier. Influences des hétérogénéité élastoplastiques sur les contraintes du deuxième ordre dans les polycristaux métalliques mono- et biphasés : calculs autocohérents - mesures par diffraction X. Autre [cond-mat.other]. Université Paul Verlaine - Metz, 1993. Français. ⟨NNT : 1993METZ005S⟩. ⟨tel-01748952⟩

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