某重型自卸车不同工况下车架的疲劳寿命分析
Fatigue Life Analysis of a Heavy Dump Truck Frame Under Different Load Conditions

为研究某重型电动轮自卸车车架疲劳寿命，根据其实际作业情况，采用惯性释放法对车架进行了各工况的有限元静力学分析。在此基础上通过准静态应力分析获得了车架关键部位应力响应因子，结合车架材料的S-N曲线。根据线性累积损伤理论及各工况载荷比重对车架进行了全寿命分析，并估算了车架总的疲劳寿命。结果表明：各工况的最大应力均未超出车架材料的屈服极限，应力的仿真数值和试验值误差在12%内，满足静强度要求。满载状态下车架的疲劳寿命大于16 814 h，基本能满足使用寿命要求。
In order to study the fatigue life of dump truck under an actual working condition, the finite element static analysis of frame under different load conditions has been done by using the inertial release method. Based on the above analysis, the stress response factor on the key positions of frame has been obtained by using the quasi-static stress analysis. According to the linear cumulative damage theory and the loads proportion, the fatigue life has been calculated combining the S-N curve of frame materials. The results show that all the maximum stress is below the yield limit of frame material, the errors between the simulation frame stress value and the experimental are less than 12%, which meet the strength requirements. The fatigue life of frame under full load condition is more than 16 814 hours, which basically meet the requirements of service life