A new method for acquiring true stress–strain curves over a large range of strains using a tensile test and finite element method

This paper presents a method for acquiring true stress–strain curves over large range of strains using engineering stress–strain curves obtained from a tensile test coupled with a finite element analysis. The results from the tensile test are analyzed using a rigid-plastic finite element method combined with a perfect analysis model for a simple bar to provide the deformation information. The reference true stress–strain curve, which predicts the necking point exactly, is modified iteratively to minimize the difference in the tensile force between the tensile test and the analyzed results. The validity of the approach is verified by comparing tensile test results with finite element solutions obtained using a modified true stress–strain curve.