球销落锤冲击的仿真研究

Simulation Study of Ball Pin Drop Weight Impact

汽车行驶中的误用工况导致底盘承受异常的冲击载荷,为避免遇到冲击载荷时底盘结构件发生断裂导致严重的整车安全事故,需要对结构件抗冲击载荷能力进行评估,尤其是球销作为底盘结构件的连接单元不允许出现断裂。对抗冲击载荷能力的评估,一方面需要采用落锤冲击试验的方法,另一方面需要开展仿真研究进行虚拟分析,提前预判抗冲击载荷设计的效果。仿真中,利用Abaqus的显式分析功能,采用Johnson-CookDamage材料损伤失效模型参数,通过不断提升落锤高度得到不同冲击能量下球销的塑性变形情况,直至球销发生断裂为止。与之同时开展了落锤冲击试验,设置相同的落锤高度来对比仿真和试验,两者结果基本吻合,为球销的抗冲击载荷正向设计提供了一个可行的途径。

The misuse of driving conditions during car operation leads to abnormal impact loads on the chassis.In order to avoid the occurrence of serious vehicle safety accidents caused by the fracture of the chassis structural parts when encountering the impact load,it is necessary to evaluate the ability of the structural parts to resist the impact load,especially when the ball pin as the connecting unit of the chassis structural parts is not allowed to break.To evaluate the impact load resistance,on the one hand,it is necessary to adopt the method of drop weight impact test.On the other hand,it is also necessary to carry out simulation research for virtual analysis and predict the effect of impact load resistance design in advance.In the simulation,the explicit analysis function of Abaqus was used,and the Johnson-Cook Damage parameters were used to obtain the plastic deformation of the ball pin under different impact energies by increasing the height until the ball pin was broken.At the same time,the drop weight impact test was carried out,and the the simulation and the test were compared by the same height setting,and the results were basically consistent,which provided a feasible way for the positive design of the impact load resistance of ball pins.