2021 Volume 71 Issue 5 Pages 208-213
Plastic behaviors of A5052-O sheet subjected to the uniaxial and biaxial tensions and the reverse and cross loadings were measured. In the reverse loading, the reyield stress and the flow stress are lower than the monotonic flow stress; the specimen exhibits the Bauschinger effect. In the cross loading, the change in the strain path results in an increase in the flow stress and a decrease in the work hardening rate. Plastic behaviors of the specimen were simulated by using a polycrystal plasticity model. It is found that the latent hardening coefficient and the back stresses of slip systems have no influence on the predicted flow stress and in-plane strain ratio for the uniaxial and biaxial tensions. In the cross loading, the latent hardening coefficient of 1.4 increases the flow stresses, which is higher than the experimental data. Incorporation of the back stress reduces the reyield stress in the reverse loading. It also decreases the reyield stress in the cross loading.
