Application of various FLD modelling approaches

Abstract

This paper focuses on a comparison between different modelling approaches to predict the forming limit diagram (FLD) for sheet metal forming under a linear strain path using the recently introduced orthotropic yield criterion BBC2003 (Banabic D et al 2005 Int. J. Plasticity 21 493–512). The FLD models considered here are a finite element based approach, the well known Marciniak–Kuczynski model, the modified maximum force criterion according to Hora et al (1996 Proc. Numisheet'96 Conf. (Dearborn/Michigan) pp 252–6), Swift's diffuse (Swift H W 1952 J. Mech. Phys. Solids 1 1–18) and Hill's classical localized necking approach (Hill R 1952 J. Mech. Phys. Solids 1 19–30). The FLD of an AA5182-O aluminium sheet alloy has been determined experimentally in order to quantify the predictive capabilities of the models mentioned above.