高速铁路钢轨剩余疲劳寿命预测研究  

PREDICTION OF RESIDUAL FATIGUE LIFE FOR HIGH-SPEED RAILWAY RAIL

作　　者：刘亮[1] 王文健[1] 郭俊[1] 刘启跃[1] 

机构地区：[1]西南交通大学牵引动力国家重点实验室摩擦学研究所,成都610031

出　　处：《机械强度》2012年第4期590-596,共7页Journal of Mechanical Strength

基　　金：国家高技术研究发展计划(863计划)(2009AA04Z424);国家科技支撑计划项目(2009BAG12A01-B05-1);西南交通大学创新团队培育计划(2007IRT01)资助项目~~

摘　　要：利用断裂力学理论建立高速铁路钢轨剩余寿命的预测模型;首先对特定线路上钢轨的动载弯曲应力、温度应力、残余应力进行计算,然后利用预测模型估算高速钢轨的疲劳剩余寿命,分析钢轨材料、列车速度系数、钢轨基础弹性系数对钢轨剩余寿命的影响。结果表明:相同营运条件下,U71Mn钢轨剩余寿命比PD3钢轨长;钢轨剩余寿命随列车速度系数的增加而降低,随钢轨基础弹性系数的增长而延长。A prediction model on residual fatigue life of high-speed railway rail was established using the fracture mechanics theory. The dynamic bending stress,temperature stress and residual stress of rail in a particular line were calculated. The residual fatigue life of rail was estimated by the prediction model. Furthermore, the effects of rail material, velocity factor and elasticity factor of rail basis on the residual fatigue life of rail were analyzed in detail. The results show that the residual fatigue life of rail made of U71Mn material was longer than that of PD3 under the same operation condition. With the increase of train velocity factor,the residual fatigue life of rail would decrease. However, the residual fatigue life would increase with the increase of the elasticity factor of rail basis.

关 键 词：PD3钢轨U71Mn钢轨剩余疲劳寿命 裂纹扩展 

分 类 号：U213.4[交通运输工程—道路与铁道工程]