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In this paper anisotropic mechanical behavior of AA2024 aluminum and Ti6Al4V titanium alloys were studied using three different approaches: unified, multi-mechanism and polycrystalline. The theoretical formulations of studied elastoplastic models are first described. Thereafter, some numerical results concerning the simulation of a uniaxial tension test applied to thin metallic sheets are presented. Comparison between experimental results (taken from the literature) and numerical simulations shows that the multi-mechanism and polycrystalline models describe slightly better the anisotropy when considering all the directions. Finally, numerical simulations of a deep drawing test of AA2024 aluminum thin sheets will be analyzed.

The purpose of this work is to evaluate the anisotropic behaviour of an AA2024-T351 thick plate using three different multi-scales approaches: a macroscopic unified model (based on HILL 48 yield loci), a multi-mechanisms model and a polycrystalline one. The experimental results obtained from uniaxial tensile tests are first described. Thereafter, theoretical formulations and identification of studied numerical elastoplastic models are presented. Finally, finite element simulations of tensile tests and analysis of drawing process are performed.

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