重载曲线缓和段钢轨滚动接触疲劳机理  

Mechanism of rolling contact fatigue occurring on rails of heavy haul railway transition line

作　　者：栗杨 白彬亨 莫日格吉勒 赵鑫[1] 温泽峰[1] 王卓 LI Yang;BAI Bin-heng;MO Ri-ge-ji-le;ZHAO Xin;WEN Ze-feng;WANG Zhuo(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;Manufacturing Department,Mongolia Baotou Steel Union Limited Company,Baotou 014010,China;Maintenance Department,China Railway Hohhot Group Limited Company,Hohhot 010000,China)

机构地区：[1]西南交通大学牵引动力国家重点实验室,四川成都610031 [2]内蒙古包钢钢联股份有限公司制造部,内蒙古包头014010 [3]中国铁路呼和浩特集团有限公司工务处,内蒙古呼和浩特010000

出　　处：《浙江大学学报（工学版）》2023年第9期1775-1784,共10页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(U21A20167);四川省国际科技创新合作项目(2021YFH0006);牵引动力国家重点实验室自主课题(2022TPL_T06)。

摘　　要：某轴重25 t运煤重载铁路半径580~1000 m的曲线入/出缓和段钢轨存在明显的滚动接触疲劳(RCF)差异现象,出缓和段的疲劳更严重.在轮轨现场观测和列车参数调研的基础上,使用Simpack建立包含2节内重联机车与108节货车的重载列车动力学模型,利用损伤函数模型数值分析入/出缓和段RCF差异的机理和主要影响因素.结果表明,RCF差异由货车曲线通过行为主导,货车中转向架导向轮对的贡献最显著,非导向轮对与机车的贡献相对轻微.在标准轮轨廓形匹配工况下,RCF差异不显著;待货车车轮磨耗失形后,钢轨磨耗失形对RCF差异的影响并不显著,轮轨蠕滑率/力在出缓和段比在入缓和段高是导致RCF差异的根本原因.磨耗后的货车转向架导向轮对与磨耗轨在小半径曲线上频繁地相互作用,是导致入/出缓和段钢轨RCF差异的主要原因.A field investigation was conducted on a heavy haul railway line with axle load of 25 t.There was a significant difference in rail rolling contact fatigue(RCF)on the entering and leaving transition sections on curves with radius of 580−1000 m,and particularly,the RCF on the leaving transition section was severer.A dynamic model of heavy haul train including two locomotives and 108 wagons was established using Simpack on the basis of on-site wheel/rail observation and train parameter investigation,and a damage function model was applied to numerically analyze the mechanism of the rail RCF difference on the entering and leaving transition sections.Result shows that the RCF difference is dominated by the curving behavior of wagons,and the contribution of the leading wheelsets is the most significant,while the contribution of the trailing wheelsets and locomotives is relatively slight.More detailed analysis shows that the RCF is not significant under the condition of standard wheel/rail profile matching.However,after the wagon wheels wear,the wheel/rail creepage and creep force on the leaving transition section are higher than those on the entering transition section,which is the primary reason for the RCF.And the effect of rail worn profile is not significant for the RCF.The frequent interaction between the worn wagons leading wheelsets and the worn rail on the sharp radius curve is the main reason for the rail RCF difference on the entering and leaving transition sections.

关 键 词：重载铁路 钢轨 滚动接触疲劳(RCF) 缓和曲线 列车动力学 损伤函数 

分 类 号：U239.4[交通运输工程—道路与铁道工程] U213.42