Modelling of Strain-Path Transients in Commercially Pure Aluminium
In the current work, the recently proposed homogeneous anisotropic hardening (HAH) model, featuring a distorted yield surface, is applied to commercially pure aluminium. A dislocation-based hardening rule is incorporated into the HAH model to describe the transient stagnation of the hardening rate during strain reversal. A cast and homogenized material with random texture previously investigated by Mánik et al.  is selected. The material is prestrained either by compression or rolling, and then tested in uniaxial tension to acquire either reverse softening or orthogonal hardening. The Bauschinger effect, the permanent softening during reverse loading and the hardening in the course of orthogonal loading are captured by the model. However, the permanent softening during orthogonal loading cannot be predicted, and the transient variations of the R-value predicted by the HAH model are neither in qualitative nor quantitative agreement with the experimental data.
Qing Liu, Jian-Feng Nie, Robert Sanders, Zhihong Jia and Lingfei Cao
J. S. Qin et al., "Modelling of Strain-Path Transients in Commercially Pure Aluminium", Materials Science Forum, Vol. 877, pp. 662-667, 2017