A generally anisotropic hardening model for big offset-strain yield stresses

In this payer, generally anisotropic quadric models for big offset-strain p lastic yield and hardening of rolled sheet-steels are proposed. They are fo rmulated in intrinsic forms such that the effects of isotropic and anisotro pic yield coefficients to the hardening factors are naturally decomposed. S uch decompositions are supported by the experimental observations and allow further simplifications. The simplified models ale capable of describing c hangeable general anisotropy of hardening, and give predictions in excellen t agreement with the experimental data. Two restricted models as special ca ses of the general model are also examined.