Comparative Evaluation of Forming Limit Curve Models for AlMg Alloys

Abstract

This publication deals with the comparative analysis of theoretical and empirical models suitable for predicting forming limit curves in the case of aluminum–magnesium alloys. The Stören–Rice and Hill–Bressan–Williams equations were evaluated and justified by inverse parameter identification. They showed good agreement with the measured strain values. Using the graphical Modified Maximum Force Criterion, it was demonstrated that the Voce hardening law is more suitable than the Swift one for characterizing this group of alloys, but the weighted combination of the two hardening laws is preferable.

Keywords

• forming limit curve
• Nakajima test
• hardening law
• yield criterion
• FLC models
• inverse parameter identification