接触应力对车轴钢旋转弯曲微动疲劳寿命的影响  

Effect of Contact Stress on Rotating Bending Fretting Fatigue Life of Railway Axle Steel

作　　者：宋川[1] 刘建华[1] 彭金方[1] 张林[1] 周琰[1] 朱旻昊[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：《材料工程》2014年第2期34-38,共5页Journal of Materials Engineering

基　　金：国家杰出青年科学基金资助项目(51025519);教育部创新研究团队资助项目(IRT1178)

摘　　要：研究LZ50车轴钢不同过盈配合接触应力水平对旋转弯曲微动疲劳寿命的影响。分别利用光学显微镜、扫描电子显微镜对过盈配合表面的微动损伤表面和断口进行分析。结果表明,随着过盈量的增加,LZ50车轴钢旋转弯曲微动疲劳寿命呈现先降低而后升高的非线性特征,这是多轴复杂应力、配合面的接触应力、微动摩擦应力以及微动磨损交互作用的结果。LZ50 railway axle steel were carried out to study the effects of contact stress on rotating bending fretting fatigue life under different press-fit contact stresses. Optical microscope （OM） and Scanning electron microscope （SEM） were used to analyze the press-fit fretting damage surfaces and fracture surfaces, respectively. The results show that the rotating bending fretting fatigue life of the LZ50 present a nonliner feature, decrease with the increase of contact stress firstly, and then increase. It is due to the combination of the complex multiaxial stress of sample, contact stress between contact interfaces, fretting frication stress and the interaction between fretting wear and fretting fatigue.

关 键 词：微动疲劳 旋转弯曲 车轴 接触应力 过盈配合 

分 类 号：TH117.1[机械工程—机械设计及理论]