Evolution of plastic deformation behavior upon strain-path changes in an A6022-T4 Al alloy sheet

The plastic deformation behavior under various strain-path changes in an A6022-T4 Al alloy sheet was studied, focusing on the evolution of direction strain rate ? and stress ratio ? after abrupt changes. A cruciform specimen used to measure change experimentally. Before change, represented well by associated flow rule with Yld2000-2d yield function isotropic hardening assumption. After abrupt-path temporarily deviated from rule, it could be again work increased roughly 4.0 MJ?m?3, which corresponded increment approximately 0.024 uniaxial tension rolling direction. transitions as a showed that both tend converge certain values regardless path if final angles are identical. It also found relationships between deviate immediately because cannot follow rapid ?. Crystal plasticity finite-element simulations reproduced qualitative tendencies observed experiments, but deviations were much more pronounced. Parametric studies tends different depending sensitivity, whereas same value irrespective sensitivity exponent. exponent m = 0.044 gave best fits experimental results terms abrupt-change path, although determined macroscopic strass-strain curves 0.002.