Calibrating a homogenized polycrystal model from large scale FE computations of polycrystalline aggregates
Résumé
Homogenization-based estimates of the effective behaviour of elastoviscoplastic polycrystals usually resort to approximations like that of an inclusion embedded in the homogeneous equivalent medium in the case of the self-consistent scheme. We propose here to replace this idealized intermediate problem by the actual computation of a polycrystalline representative volume element. Computations of a cube made of 200 zinc grains are presented and used to calibrate the scale transition rule of a simplified homogenized polycrystal model. A coupled identification procedure is presented to determine both intragranular material parameters and scale transition parameters from experimental tension, creep and relaxation tests.
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