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针对自卸汽车前桥单纵臂悬架纵臂断裂失效情况,通过对断口进行宏观分析,利用有限元软件对悬架结构进行显式动力学分析,对悬架在3种典型工况下运行状态进行显式动力学计算,找出纵臂上应力和塑性应变变化较大的部位,分析失效原因,提出改进措施,并对改进后的方案进行显式动力学计算,以验证改进方案的正确性与合理性。结果可知:在路面冲击和瞬时转向的情况下,转向节和纵臂连接处、纵臂三角形区域以及纵臂与销轴的连接处都会产生比较大的冲击载荷,容易造成断裂。整个悬架的改进,不仅在结构上给予加强,工艺处理上也提出改进。分析结果表明改进方案是有效的、正确的,为实车试验奠定基础。
Aiming at the failure of the longitudinal arm of the single longitudinal arm suspension of the dump truck, the dynamic analysis of the suspension structure is carried out by using the finite element software and the suspension is operated in three typical working conditions State explicit dynamic calculation to find the trapezoidal arm stress and plastic strain changes larger parts, analysis of the causes of failure, the improvement measures proposed, and the improved program explicit dynamic calculations to verify the correct program to improve Sex and rationality. The results show that: in the case of road impact and instantaneous steering, the knuckle and trailing arm joints, the trapezoidal triangular region and the connection between the trailing arm and the pin shaft will generate relatively large impact loads, which may cause fracture easily. The whole suspension improvement, not only to give the structure to strengthen the process also made improvements. The analysis results show that the improvement plan is effective and correct, which lays the foundation for the real vehicle test.