Abstract:

The Bauschinger-like effect, which showed up in the straightening process of the AZ31 magnesium alloy wide sheet, was investigated through the multi-pass discrete three-point bending-unloading-bending (BUB) experiments. The stress variable, anisotropy, and asymmetry of tension and compression on the straightening process were corresponding to the Bauschinger-like effect. The Bauschinger-like effect in the initial, intermediate, and end of the straightening process was dominated by the twinning, detwinning, and dislocation induced by pyramidal < c + a > slip, respectively. Also, they were responsible for the transformation of the Bauschinger stress parameter (BSP) and Bauschinger energy parameter (BEP). Later, the anisotropic nonlinear kinematic hardening model (ANK model) to describe the Bauschinger-like effect was optimized and simplified.

Key words: Bauschinger-like effect, Straightening, Discrete experiments, Anisotropic nonlinear kinematic hardening model (ANK model)