西南交通大学学报 2007, 42(3) 262-268 DOI:     ISSN: 0258-2724 CN: 51-1277/U

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本文关键词相关文章
轮轨接触应力
残余应力
残余应变
弹塑性
有限元法
本文作者相关文章
郭俊
温泽峰
金学松
刘启跃
PubMed
Article by GUO Jun
Article by WEN Zefeng
Article by JIN Xuesong
Article by LIU Qiyue

钢轨三维弹塑性滚动接触应力

郭俊, 温泽峰, 金学松, 刘启跃

西南交通大学牵引动力国家重点实验室, 四川, 成都, 610031

摘要

用有限元法建立了钢轨三维弹塑性滚动接触计算模型,分析钢轨材料屈服强度对钢轨残余应力和应变的影响.模型中考虑了钢轨的几何形状和边界条件,通过在钢轨表面反复施加移动赫兹法向压力和切向力模拟车轮的反复滚动作用.结果表明:最大等效塑性应变和剪应变均发生在钢轨接触表面,此处易萌生裂纹;钢轨接触表面附近材料塑性变形流线趋势与现场观测到的裂纹方向一致;钢轨材料屈服强度越高,材料的累积塑性变形越小,钢轨的最大残余应力越接近于表面.

关键词 轮轨接触应力   残余应力   残余应变   弹塑性   有限元法  

Three-Dimensional Elastic-Plastic Rolling Contact Stresses in Rail

GUO Jun, WEN Zefeng, JIN Xuesong, LIU Qiyue

State Key Lab.of Traction Power, Southwest Jiaotong University, Chengdu 610031, China

Abstract:

A three-dimensional elastic-plastic model of wheel-rail rolling contact was established by finite element method to investigate the effect of yield stress of rail material on residual stresses and strains in the rail.In the model,the geometry and boundary conditions of the rail were taken into account.Repeated wheel rolling and sliding were simulated by multiple translations of normal and tangential surface tractions with Hertz form across rail running surface.The results show that the maximum equivalent plastic strain and shear strain occur on the contact surface,where the cracks initiate easily.The plastic flow direction in the rail near the contact surface is consistent with that observed in the field.An increase in yield stress of rail materials leads to a decrease in residual deformation,and drives the location of the absolute values of the maximum residual stresses to the contact surface.

Keywords: wheel-rail contact stress   residual stress   residual strain   elastic-plasticity   finite element method  
收稿日期 2006-12-25 修回日期  网络版发布日期  
DOI:
基金项目:

国家自然科学基金资助项目(50675183);教育部博士点基金资助项目(20060613020)

通讯作者:
作者简介: 郭俊(1972- ),男,副研究员,研究方向为轮轨滚动接触疲劳,电话:028-87600271,E-mail:guojun@home.swjtu.edu.cn

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