Plastic Anisotropy and Formability of Aluminum Alloy Sheets. Numerical simulation of formability for Al-Mg alloys with plastic anisotropy.

Crystallographic texture is an important material characteristic for the formability of Aluminum alloys. The r-value is well known as a good index of formability for steel. However, there is no such index for aluminum alloys. In this paper, we discuss forming limit strains at the bi-axial region as the formability. We will discuss such an index for aluminum alloys by using numerical simulation and data analysis, in the following steps: Experimentally, we determined a yield function. Such functions can predict the yield surfaces and r-value distributions. Examining the experimental data, we confirmed the reliability of prediction of forming limit strains to predict forming limit strains by using the M–K model. Finally, we will propose a simple linear equation by using mean r-value, Δr-value and work hardening parameters. This equation can separate texture effect and work hardening effect on the forming limit strains. This equation well predicts the formability for 11 examined Al–Mg alloys.