高速铁路焊接区轮轨动力学响应及疲劳分析  

Dynamic Response and Fatigue Analysis of Wheel/rail in the Weld Zone of High-speed Railway

作　　者：林凤涛[1] 张子豪 翁涛涛 方琴 贾喆 陈武[2] 黄金霞 LIN Fengtao;ZHANG Zihao;WENG Taotao;FANG Qin;JIA Zhe;CHEN Wu;HUANG Jinxia(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Key Laboratory of Conveyance and Equipment of the Ministry of Education,East China Jiaotong University,Nanchang,Jiangxi 330013,China;Anhui Huirui Orbital Smart Equipment Co.Ltd,Hefei,Anhui 231638,China)

机构地区：[1]省部共建轨道交通基础设施性能监测与保障国家重点实验室(华东交通大学),南昌330013 [2]载运工具与装备教育部重点实验室(华东交通大学),南昌330013 [3]安徽辉瑞轨道智能设备有限公司,合肥231638

出　　处：《铁道工程学报》2023年第9期23-32,53,共11页Journal of Railway Engineering Society

基　　金：国家自然科学基金项目(52065021,51865009,51975210)。

摘　　要：研究目的:针对不同行车条件下,高速列车通过钢轨焊缝区高频振动及轮轨冲击损伤问题,应用列车系统动力学理论,构建车辆–轨道耦合动力学模型,对钢轨焊接区典型不平顺对轮轨垂向动态响应特征及发生疲劳损伤的可能性进行研究。研究结论:(1)高速列车通过下凹型焊缝的轮轨冲击作用强于上凸型焊缝,通过W型不平顺的轮轨垂向动态作用强于V型不平顺;(2)随着焊缝区不平顺波深的增加或波长的减小,轮轨垂向响应增强,在铁路钢轨养护中,建议以波深0.4 mm及波长0.4 m为焊缝区限值进行打磨养护;(3)结合安定理论,确定钢轨焊缝的疲劳损伤区,横移量大于9.5 mm时,疲劳因子大于零,当横移量达到10.1 mm,上凸型焊接区疲劳因子达到0.041,下凹型焊接区疲劳因子达到0.068,下凹型焊缝更容易产生疲劳裂纹;(4)本研究成果可为高速铁路焊接区裂纹萌生可能性的预测及钢轨养护提供借鉴。Research purposes:Aiming at the problems of high-frequency vibration and wheel-rail impact damage of high-speed trains passing through the rail weld zone under different driving conditions,the vehicle-track coupling dynamic model is constructed by applying the train system dynamics theory,and the vertical dynamic response characteristics of typical irregularity of rail weld zone to wheel-rail and the possibility of fatigue damage are studied.Research conclusions:(1)The wheel-rail impact of high-speed train passing through concave weld is stronger than that of convex weld,and the vertical dynamic effect of wheel-rail passing through W-type irregularity is stronger than that of V-type irregularity.(2)With the increase of wave depth or the decrease of wavelength in the weld zone,the vertical response of wheel/rail is enhanced.In the actual line maintenance,it is recommended to use 0.4 mm wave depth and 0.4 m wavelength as the weld zone limit for grinding and maintenance.(3)Combined with the stability theory,the fatigue damage zone of the rail weld is determined.When the transverse displacement is greater than 9.5 mm,the fatigue factor is greater than zero.When the transverse displacement reaches 10.1 mm,the fatigue factor of the convex weld zone reaches 0.041,and the fatigue factor of the concave weld zone reaches 0.068.The concave weld is more likely to produce fatigue cracks.(4)The research results can provide reference for the prediction of crack initiation possibility in high-speed railway weld zone and rail maintenance.

关 键 词：轮轨力 焊缝不平顺 焊缝幅值与波长 疲劳因子 

分 类 号：U213.92[交通运输工程—道路与铁道工程]