Simulation and experimental comparison study based on predicting forming limit curve of SUS304 sheet material

Abstract

In this study, the modified maximum force criterion was used to ensure an accurate determination of the forming limit curve (FLC) for the SUS304 sheet metal. At first, the stress–strain curves according to Voce and Swift hardening models were verified using the experimental data and the stress function deduced by Hill in 1984 to predict FLCs. The accuracy of the FLCs was evaluated by analyzing the equivalent fracture strain data at three distinct locations: Biaxial tensile strain (BT, [Formula: see text]), uniaxial tensile strain (UT, [Formula: see text]), and plane strain (PS, [Formula: see text]), and then comparing them with the corresponding linear FLC experimental data. The accuracy of the predicted FLCs was further tested by comparing the fracture height of the samples according to the Nakazima model in the FEM simulation and the corresponding experiments.