轮式挖掘机驱动桥壳疲劳失效分析

Fatigue Failure Analysis of Drive Axle of Wheel Excavator

驱动桥壳作为轮式挖掘机的重要承载部件,疲劳断裂是其主要的失效方式,应保证其具有足够的使用寿命。针对该问题,对某轮式挖掘机驱动桥壳进行静力学和动力学分析,找出桥壳应力较大的危险区域和模态特性;运用试验测得的载荷谱得到危险区域危险点的应力和位移的动态响应;结合Miner线性损伤累积法和Goodman法对桥壳材料S-N曲线进行修正,对桥壳进行疲劳寿命分析,得到桥壳整体的疲劳寿命和安全系数。结果表明:该桥壳满足使用寿命要求。

Driving axle housing is an important bearing member of wheeled excavator, and the fatigue fracture is a major failure way of it, which should ensure that has sufficient service life. First of all, using the static and dynamic analysis of axle housing to identify the danger zone with stress greater and modal characteristics according to FEM. The test load spectrum was used to find stress and displacement of the danger zone danger point. The S-N curve of the axle housing was amended with the method of Miner linear cumulative damage law and Goodman law. Cumulative fatigue damage of driving axle housing by Ansys workbench to obtain the fatigue life and the safety factor of the whole driving axle housing. The results show that the service life of axle housing meets the demand.