扭曲载荷对160km/h货车转向架构架焊缝的疲劳损伤影响

依据UIC510-3规定的动态疲劳试验载荷和IIW提供的焊接接头疲劳强度S-N曲线,基于结构有限元分析技术和Palmgren-Miner线性累积损伤准则,对160 km/h货车转向架焊接构架侧梁主结构焊缝接头的疲劳损伤进行数值仿真计算。着重研究有无扭曲载荷作用下,各疲劳关注部位累积损伤的变化程度和规律。仿真结果及综合分析表明:扭曲载荷作用导致的损伤增幅在累积损伤较高部位最大仅约为6%,其对构架主结构的疲劳损伤影响极为有限。因此考虑到疲劳试验设备的加载能力,对160 km/h货车转向架焊接构架及摇枕进行动态疲劳试验时可不必施加线路扭曲载荷。

Effect of Torsional Loads on Fatigue Damage of Welds in Frame for 160 km/h Wagon Bogie

According to the dynamic fatigue testing loads stated in UIC510-3 and the welded joints fatigue strength S-N curves provided by IIW,the fatigue damage of welded joints in main structures of welded sideframe for 160 km/h wagon bogie were calculated by numerical simulation method based on FEM and Palmgren-Miner linear cumulative damage rule.The cumulative damage changing extent and pattern of every considered position were mainly researched whether the torsional loads were applied or not.The calculating results and comprehensive analysis show that the maximal enhanced damage percentage on positions where the cumulative damage is relatively higher is only about 6% while applying the torsional loads.Its effect on fatigue damage of frame main structures is very limited.So considering the loading capabilities of the fatigue test installation,the track torsional loads are not necessary to be applied when carrying out the dynamic fatigue testing of welded frame and bolster for 160km/h wagon bogies.