重型自卸车疲劳寿命分析

Fatigue Life Analysis of a Heavy Dump Truck

为解决三轴重型自卸车车架过早出现断裂的问题,文章使用有限元分析软件Ansys分析自卸车在弯扭工况下推杆的静态强度和刚度,获取车架模态振型和模态频率并生成车架的MNF文件(模态中性文件),测试板簧和减振器特性,在ADAMS中建立了整车的刚-柔混合仿真模型,基于车架材料的疲劳特性曲线S-N,使用MSC.Fatigue软件对车架进行了全寿命疲劳分析,为重型自卸车的改进设计提供了参考。

To solve the problem of a triaxial heavy-duty dump’s putting rod ruptures prematurely,When the dump in the bending and twisting conditions, the push rod’s static strength and stiffness was analysed by Ansys software,and get the modals shapes and modal frequencies and generated a frame MNF file(modal neutral file),test the character of leaf spring and damper,established the rigid-flexible coupling model of the truck in ADAMS, Based on the material fatigue properties’ S-N curve of the frame, using of MSC.Fatigue software the frame’s life was analysed,in order to improve the design of heavy-duty dump truck provides a reference. process of PVE test, studies the method of fault simulation, and completes the PVE test by the way of automation.