某重型卡车后挡泥板支架断裂分析及优化

在进行45 000 km耐久试验过程中，某重型卡车样车后轮后挡泥板右侧断裂。基于Nastran的频率响应分析对该挡泥板进行仿真分析，找出断裂失效的原因；基于变密度法的拓扑优化方法，优化后得出不同的密度云图，根据密度云图所示材料分布，合理布置加强筋的位置。改进后的方案制作样件进行路试检验，顺利通过了45 000 km耐久试验，挡泥板右侧无断裂现象，由此表明了改进措施能够有效的解决挡泥板断裂问题。

FRACTURE PROBLEM AND TOPOLOGY OPTIMIZATION ANALYSIS FOR REAR FENDER OF A HEAVY TRUCK

During the 45 000 km road durability test of a heavy truck vehicle,the fracture problem occured on the rear fender. The frequency response of the rear fender was simulated and analyzed by Nastran,and the fracture problemwas found. Based on variable density method of the topology optimization method, the different density maps were obtained, and the location of the reinforcement was reasonably arranged according to the material segment. The improved scheme of the prototype made the road test, successfully passed the 45000 km endurance test, found no fracture phenomenon at the right fender, which indicated that the improved measures could solve the problem of fender fracture effectively.