通过焊点撕裂试验（搭接拉剪、剥离拉伸和KS-II拉伸），研究了DP590高强钢焊点在不同受力条件下的碰撞失效力学响应；提出了考虑弯矩传递和焊接热影响区的焊点建模方法，基于DP590钢的CrachFEM材料模型，通过焊点撕裂试验结果与仿真结果对标，获得了热影响区CrachFEM材料模型的修正系数，通过子系统三点弯曲压溃试验，对仿真结果进行验证。结果表明：焊点试样均在热影响区发生撕裂；子系统试验得到的力-位移曲线与仿真结果具有较好的一致性，仿真和试验获得的失效载荷相对误差在1%以内，说明提出的焊点失效模拟方法可以较准确地预测DP590高强钢焊点的碰撞失效行为。

By spotweld tearing tests (lap-shear tension, coach-peel tension and KS-Ⅱ tension), the collision failure mechanical response of DP590 high-strength steel spotweld under different stress conditions was studied. The spotweld modeling method was proposed by considering bending moment transmission and welding heat-affected zone. With the CrachFEM material model of DP590 steel and by the benchmarking of the spotweld tearing test results and simulation, the correction coefficients of the CrachFEM material model for the heat-affected zone were obtained. The simulation was verified by three-point bending crush tests of the subsystem. The results show that all the spotweld samples were torn in the heat-affected zone. The force-displacement curve obtained by the subsystem test was in good agreement with the simulation, and the relative error of the failure load obtained by the simulation and the test was below 1%, indicating that the proposed spotweld failure simulation method could accurately predict the collision failure behavior of DP590 high-strength steel spotweld.