钢轨打磨热力耦合分析  

Thermal-mechanical Coupling Analysis in Rail Grinding

作　　者：张青[1] 崔晓璐[1] 陈光雄[1] 周仲荣[1] 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《铁道学报》2015年第5期78-82,共5页Journal of the China Railway Society

基　　金：国家自然科学基金(U1134103)

摘　　要：基于热机耦合方法,运用有限元软件ABAQUS,建立钢轨打磨三维热弹性有限元模型,分析钢轨打磨过程中的温度、应力及应变。分析不同车速、不同砂轮转速及不同数量打磨磨头对钢轨表面温度的影响。结果表明;打磨过程是快速升温、缓慢降温的过程,打磨高温区的深度很浅,且高温区的温度场、等效应力场均呈椭圆状;钢轨表面温度随列车速度的增加而减小,随砂轮转速的增加而增加;钢轨表面温度随打磨磨头数量的增加而显著增加,打磨温度在250℃~500℃之间,符合实际情况。Based on the thermal-mechanical coupling method, using FEM software ABAQUS, a three-dimensional thermal-elastic finite element model for rail grinding was established to analyze temperature, stress and strain of rail during rail grinding. The effects of different train speeds and grinding wheel speeds as well as the number of different grinding wheelheeds on the temperature of the rail surface were investigated in detail. A- nalysis results showed that in the grinding process the working rail block was heated rapidly but cooled slowly. The depth of the high temperature area from grinding was thin. The temperature fields and equivalent stress fields of the high temperature area were found to be in the shape of an ellipse. The rail surface temperature decreased with the increase of train speed and increased with the increase of the speed of grinding wheels. The rail surface temperature also increased significantly with the increase in the number of the grinding wheelheads. The grinding temperature was between 250℃ and 500℃, which is in conformity with the practical situation.

关 键 词：钢轨打磨 有限元 热力耦合 热弹性模型 

分 类 号：TH117.3[机械工程—机械设计及理论]