城轨列车转向架铝合金焊接枕梁的抗疲劳设计

Anti-fatigue design of aluminum alloy welded bolster of urban rail train bogie

以城轨列车转向架铝合金枕梁为研究对象,基于Miner线性累积损伤理论和NASA小载荷S-N曲线延伸法,对枕梁主要焊缝进行了疲劳寿命评估.依据线路实测数据得到枕梁的载荷工况,设计了枕梁的疲劳试验方案.对没有通过疲劳试验的区域,采取了优化连接筋板厚度和减小应力集中等措施.结果表明铝合金枕梁新结构能够满足疲劳寿命要求.

It takes the aluminum alloy bolster of bogie as the study object in this paper. The fatigue life of main welds in bolster was evaluated based on Miner linear cumulative damage theory and NASA small load S-N curve extension method. Calculated work conditions were obtained from measured data in field tests, and fatigue test scheme for bolster was designed. Then measurements of optimizing the thickness of joint stiffeners and minimizing stress concentration were taken in areas that failed to pass the fatigue test. Finally it is verified that the new aluminum alloy bolster of bogie can meet the demand of fatigue life after improvement.