摘要
高铁车轮轴与轮毂过盈配合部位常常发生相对滑动,导致微动磨损,影响了车轴的疲劳性能。采用轴/套管试样模拟车轴/轮毂结构,应用悬臂梁旋转弯曲方法研究了动车组EA4T车轴钢室温微动疲劳性能,绘制了疲劳S-N曲线。结果表明微动磨损降低了EA4T车轴钢的疲劳寿命;随着过盈量的增加,轴上承受的压应力、轴向摩擦力和磨损区域增大,出现氧化铁磨屑,疲劳极限下降;多源疲劳裂纹均萌生于轴/套管接触区边缘轴的表面,疲劳裂纹扩张区出现疲劳辉纹,最终以韧窝形式发生断裂。初步提出微动疲劳极限预测方法。
Relative sliding on the interference fit positions between axle and hub of the high speed trains usually results in fretting wear,which strongly affect the fatigue properties of the axle.In this work,using the sample of axle/pipe couple to simulate the axle and hub structure,the fretting fatigue behavior of EA4T steel under rotating bending and was investigated and the fretting fatigue stress-life curves were obtained.The results show that the fretting wear is detrimental to the fatigue behavior of the EA4T axle steel.With the increase of the interference fit,the fatigue limit of the EA4T axle steel is decreased,owing tothe higher pressure stress,friction force and wear region on the axle surface,and thewear product of ferric oxide as well.Multi-crack is found to initiate at the axle surface of theaxle/pipe contact edge,while the fatigue striations arise in the crack propagation zone,and the instant aneous fracture adopts a ductiledimple mode.Finally,a prediction formula for the fretting fatigue limit is proposed preliminarily.
作者
尹鸿祥
吴毅
李翔
张关震
王长峰
沙江波
YIN Hongxiang;WU Yi;LI Xiang;ZHANG Guanzhen;WANG Changfeng;SHA Jiangbo(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Zhiqi Railway Equipment Co.,Ltd.,Taiyuan Shanxi 030012,China;School of Materials Science and Engineering,Beihang University,Beijing 100191,China)
出处
《高速铁路新材料》
2022年第1期36-42,共7页
Advanced Materials of High Speed Railway
基金
中国铁道科学研究集团有限公司科研项目(2021YJ223)。
