A Comparison Study by Simulation/Experiment to Verify the Effect of Predicted Forming Limit Diagram Based on Graphical Method at Elevated Temperature for SPCC Sheet Material

Abstract

Sheet metal forming processing based on the deformation of materials has taken an important position with an increasing proportion in mechanical manufacturing and metallurgy. In this study, in order to predict more accuracy forming limit curve (FLC) at elevated temperature, the uniaxial tensile test of SPCC sheet material at 150 °C was first performed to obtain the stress-strain curve at 150 °C. The graphical method based on the Modified Maximum Force Criterion (MMFC) was then applied to estimate the FLCs according to the hardening law of Swift at 150 °C elevated temperature. After that, the obtained FLCs data were used for numerical simulation using the finite element method (FEM) to predict the fracture heights of the SPCC sheet material cup by deep-drawing process and compare with corresponding experimental results. Comparison results between simulation and experiments show that Swift’s hardening model presents good predictions for fracture height compared to experimental data.