吊装设备振动冲击下的铝合金车体C型槽疲劳强度分析

Fatigue Strength Analysis of C Groove Structure of A-Alloy Train Body under Vibration Load of Suspension Equipment

针对吊装设备振动冲击下的车体承载结构疲劳损伤问题,采用有限元法对某型动车组车顶净水箱吊装设备振动冲击下的车体C型槽疲劳强度进行仿真分析.根据EN 12663标准确定净水箱的工作载荷工况,计算出吊装组件连接螺栓承载力,作为C型槽疲劳强度计算载荷.假定各载荷工况出现频率相同的情况下,构造了工作载荷历程.采用有限元法分析了C型槽在工作载荷下的静强度与疲劳强度.计算结果表明:振动冲击下,C型槽最大值应力值为13.8 MPa,远小于材料的屈服强度,表明在正常运行工况下C型槽不会出现塑性破坏;在1.0×107设计寿命下,结构最小安全系数为13.625,表明在指定的设计寿命内C型槽不会发生疲劳破坏.

For researching the fatigue characteristics of the loading location of train body under vibration load of suspension equipments,the fatigue strength of train body C groove structure of Electric Multiple Units under vibration load of water tank was computed by Finite Element Method. The work loads of water tank were defined according to EN 12663 standard. The loads of joint bolts of suspension components were calculated and seen as work load of C groove structure. The load time histories were constructed considering the same appearing frequency of the work loads. The siatic and fatigue trengths of C groove structure under work loading were analyzed by Finite Element Method. The results show that the maximum stress of the C groove structure is 13.8 MPa under vibration load. It is lower than the yield stress of train body material,so it will not be damaged plastically. The minimunl factor of strength is 13. 625 when the design life is 1.0× 10^7cycles,which means that the fatigue damage behavior will not happen on C groove structure.