Correlation of FEA Prediction And Experiments On Dual‐Phase Steel Automotive Rails

The North American Auto/Steel Partnership (A/SP) High‐Strength Steel Forming Project Team has been studying the impact of advanced high‐strength steels on stamping of structural components. Tooling was built to evaluate the effect of different grades of dual‐phase steels on rail type stampings. The formed panels were laser scanned and the amount of springback was measured against the design intention. FEA simulation of the forming process was carried out to validate the numerical modeling techniques in the large and complex dual‐phase steel stampings. The materials used in the study were Dual‐Phase (DP) Steels DP600, DP780 and DP980. The FEA solver used was LS‐Dyna version 971. The simulation results were correlated with the measurement data under various forming conditions including forming methods, trimming, binder and pad pressures. Reasonably good correlations were obtained across different grades of steels in terms of flange opening angles, wall opening angles, twist angles and dimensional deviations.