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为了验证160 km/h货车转向架焊接部件的疲劳强度,依据UIC510-3标准规定的疲劳试验载荷确定方法和IIW提供的焊接接头疲劳强度S-N曲线,应用结构有限元技术及Palmgren-Miner线性累积损伤准则,对焊接构架及摇枕主结构危险焊缝接头进行了疲劳损伤数值仿真分析.结果表明:侧滚动载系数变化对疲劳损伤影响较小,浮沉动载系数变化对疲劳损伤影响显著.在对焊接构架和摇枕进行疲劳试验验证时,侧滚动载系数可直接取标准值0.22,浮沉动载系数应比标准值0.30适当增大,可初步取为0.33.
In order to verify the fatigue strength of the welded parts of the bogie for 160 km / h truck, fatigue test load was determined according to the UIC510-3 standard and the fatigue strength SN curve of the welded joint provided by IIW. The finite element method and the Palmgren-Miner linear cumulative damage The results show that the change of roll load coefficient has little effect on the fatigue damage and the change of dynamic load factor has a significant impact on the fatigue damage.After the calculation of the fatigue damage of the welded joint and the welded joint, Welded frame and bolster fatigue test verification, the rolling load coefficient can be directly take the standard value of 0.22, Floating and Rolling dynamic load factor should be increased appropriately than the standard value of 0.30, initially taken as 0.33.