J. Phys. IV France 11 (2001) Pr5-277-Pr5-284
Calibrating a homogenized polycrystal model from large scale FE computations of polycrystalline aggregatesF. Barbe, R. Parisot, S. Forest and G. Cailletaud
École des Mines de Paris, Centre des Matériaux, UMR 7633 du CNRS, BP. 87, 91003 Evry, France
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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