Incompatibilités de déformation : modélisations micromécaniques et applications aux matériaux cristallins fortement anisotropes

Abstract : My research activities deal with mechanical field predictions in strongly anisotropic crystalline materials in relation with strain incompatibilities ge- nerated by microstructural defects (dislocations, twins, grains). This issue is tackled according to several modeling approaches, which were confronted with observation (field measurements, mechanical tests at the micrometric scale, electron microscopy). The first one consists in crystal plasticity si- mulations enclosing a coupling with the transport of polarized dislocation densities, which makes it possible to account to some extent for the spatio- temporal organization of dislocations. The second way consists in the development of explicit analytical expressions of stresses and elastic rotations at plane interfaces in the context of heterogeneous anisotropic thermoelasticity with plastic distortions and grain boundary sliding. Such expressions pro- vide first order effects and allow to test a very large number of configurations thanks to instantaneous results. Micromechanical approaches have also been proposed to capture grain size effects during homogenization procedures from the physics of intra-granular processes. Finally, an elasto-viscoplastic self-consistent model was used to study the anisotropy and work hardening of titanium under tensile conditions from an assumption of different viscosities between slip families.
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Thiebaud Richeton. Incompatibilités de déformation : modélisations micromécaniques et applications aux matériaux cristallins fortement anisotropes. Sciences de l'ingénieur [physics]. Université de Lorraine, 2017. ⟨tel-01559259v2⟩

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