[SY-E11] Thermodynamically consistent directional distortional hardening of wrought Mg alloys: experimental investigation and constitutive modeling
Invited
As a lightweight structural material, magnesium alloy exhibits strong anisotropy due to texture, which limits its use in energy-saving lightweight structures. This pronounced anisotropy cannot be captured by only classical isotropic or kinematic hardening due to the constant shape evolution of yield surfaces during plastic deformation. Therefore, the shape evolution of yield surface, named as distortional hardening is the main approach to capture the anisotropic behavior of Mg alloy. Moreover, stress state is changing during forming process such as deep drawing, i.e., the loading history effect during plastic deformation cannot be ignored. Thus, focusing on loading path dependent distortional hardening of AZ31 Mg alloy, experimental investigation on the evolution of anisotropy is performed, moreover, a constitutive model with distortional evolution of yield surfaces is developed based on elasto-plasticity theory at finite strain. Thermodynamical consistency is proved. The anisotropic mechanical behavior of AZ31 Mg alloy is demonstrated after model parameters calibrated with experiments.