| Summary: | The Forming Limit Stress Diagram (FLSD) can accurately describe the forming process of high-strength steel. However, obtaining FLSD is relatively difficult. In order to predict fracture in advanced high-strength dual-phase (DP) steels, limit maximum and limit minimum principal strains of sheet were obtained through multiple sets of test and simulation. Two material parameters, strength coefficient <i>K</i> and hardening exponent <i>n</i> are introduced into the FLSD function which is established by the strain-stress transformation function. The function shows that the <i>k</i>-value determines the value of the maximum principal stress, while the <i>n</i>-value affects the curvature of the curve. Verification of correctness by testing and simulation to within 10% accuracy. This paper explores a new approach to FLSD research based on material properties, which can expand the application scope of FLSD.
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