切向载荷对钢轨弹塑性滚动接触应力的影响分析  

Effect of Tangential Force on Elastic-plastic Rolling Contact Stress of Rail

作　　者：郭俊[1] 温泽峰[1] 李伟[1] 金学松[1] 

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

出　　处：《润滑与密封》2010年第7期5-8,共4页Lubrication Engineering

基　　金：国家自然科学基金项目(50675183);教育部新世纪优秀人才支持计划项目(NCET-08-0824);霍英东教育基金会青年教师基金项目(114028);四川省青年科技基金项目(08ZQ026-021).

摘　　要：利用建立的钢轨三维弹塑性滚动接触有限元模型,分析车辆通过曲线轨道时轮轨接触表面切向力对钢轨滚动接触应力和应变的影响。结果表明:钢轨材料的累积塑性变形、残余应力和残余应变都随切向力的增大而增大;纵向切向力与法向力之比大于0.3时其对塑性变形、残余应力和残余应变影响明显,钢轨的最大残余应力、最大等效塑性应变和剪应变均发生在钢轨接触表面,裂纹易萌生于接触表面,与现场观察结果相一致。In order to better understand the mechanism ot wheel-rail rolling contact iatigue, a three-dimensional elasticplastic model of wheel-rail rolling contact was established by finite element method. The effect of wheel-rail tangential force on the residual stresses and strains of rail was investigated by using the model. The resuhs show that the accumulated plastic deformation, residual stresses and residual strains of rail increase with increasing the tangential force. When the ratio of the tangential force to the normal force is equal to or larger that 0. 3, the tangential force has a large influence on the plastic deformation, residual stresses and residual strains of rail. The maximum residual stresses, maximum residual accumulated equivalent plastic strain and maximum shear strains occur on the contact surface of rail where the cracks initiate easily. The analytical result is in line with the site observation.

关 键 词：轮轨接触 切向力 残余应力 弹塑性 有限元法 

分 类 号：U217.5[交通运输工程—道路与铁道工程]