Modeling of plastic anisotropy with reduced polycrystalline models. Application to aluminum alloys
Résumé
The modeling of deviations from isotropic hardening still is a difficult task for macroscopic models, in particular for non-proportional loading paths. The alternative polycrystalline models suffer from large CPU time in FE analyses and do not always give simultaneously a good description of flow stresses and transverse strain rates. Due to a specific parameter calibration procedure, a “reduced” polycrystalline model with 8 orientations only is in excellent agreement with all experimental curves for a 2090-T3 aluminum sheet. FE calculations of a punch test with contact and friction give CPU times only 15% larger than with a macroscopic model.
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