Simulation about the Influence of Stamping, Springback and Strain Rate on Collision Performance of Dual-Phase Steel Parts

Based on cold rolled galvanized dual-phase steel sheet, collision analysis model of closed hat section beam was established on the basis of simulation analysis of U-beam stamping and springback. Mapping was used to transfer results of thickness, stress and strain of U-beam to impact structural component. Collision processes of closed hat section were analyzed by considering the influence of stamping, springback, strain rate and so on. The results show that the strain rate was higher in the process of collision and its influence was most apparent and should be specially considered in the definition of model. Due to the work hardening and thickness reduction in metal deformation, the stamping results affected simulative results of the collision process directly. Residual stress was weaker due to the stress released from the inside of the component after stamping. Therefore, greater external force was needed to produce the same degree of collision, and rigid wall reaction force considered springback was higher than that no considering.