针对冷轧镀锌双相钢板, 在完成U型梁冲压成形及回弹模拟分析的基础上, 建立了闭口帽型梁的碰撞分析模型;采用映射的方法完成了U型梁的厚度、应力、应变向碰撞结构件的结果传递; 在考虑冲压成形、回弹及应变速率等的情况下, 对帽型梁的碰撞过程进行了模拟分析。结果表明: 在碰撞过程中, 由于应变速率较高, 它的影响最为明显, 在模型的定义过程中需要着重考虑; 因为金属变形过程的加工硬化和厚度减薄等因素的影响, 冲压结果直接影响碰撞过程的模拟结果; 冲压后因回弹使零件内部的应力得到释放, 残余应力减小, 因此导致碰撞过程中产生相同的变形需要更大的外力, 考虑回弹的刚性墙反力要比没有考虑时的高。

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.