On the Failure Prediction of Dual-Phase Steel and Aluminium Alloys Exposed to Combined Tension and Bending

Abstract

The interest in accurate prediction of failure of sheet metals in the automotive industry has increased significantly over the last two decades. This paper aims to evaluate two failure prediction approaches implemented in the commercial Finite Element code AutoFormplus R7.04; (i) the standard Forming Limit Diagram (FLD), and (ii) the Non-linear Forming Limit Diagram. The evaluation will be testing the two approaches accuracy on predicting failure of both an AA6016 aluminium alloy and a CR440Y780T-DP dual-phase steel alloy specimen exposed to combined tension and bending. Based on the findings of this study, it is concluded that neither of the evaluated approaches is able to accurately predict failure in both cases presented.

Prediction of forming limit diagram of automotive sheet metals using a new necking criterion

“…A proper material model is needed to calculate the theoretical FLC. For this purpose, constitutive models used to describe material's behavior under complex stress states were previously calibrated by Barlo et al [11] and not be repeated here. The Swift hardening law [1] is adopted for DP800 whereas the Voce model [2] is applied for AA6016.…”