Ratcheting crystal plasticity modeling in microstructure of magnesium alloy under stress-controlled cyclic tensile loading with non-zero mean stress

Todays, the requirement of lowering the vehicle weight for the reduction of the fuel consumption and emissions, one of the methods considered by designers is to use the ligh magnesium alloy under cylclic loadings. In this article, considering the microstructure of the AZ91D magnesium alloy, its crystalline structure, a model for predicting the ratcheting behavior of this alloy was adapted and verified based on experimental data. The crystallographic texture of this alloy will be introduced into the model respecting the manufacturing process of the shaping conditions. The proposed model, in order to simulate the ratcheting deformation, had an acceptable accuracy. However, the values of the ratcheting strain were over-predicted. Moreover, the crystal plasticity model could simulate the first and second stages of ratcheting, hardening effects, mean stress, and stress amplitude, with a higher accuracy.