中文摘要：

热损伤是铁路车辆轮轨的主要失效形式之一.当列车在短时间内紧急制动或加速牵引时,车轮和钢轨接触面间容易发生纯滑动现象,该滑动就会导致轮轨出现较高的接触温升,温升达到一定时会使车轮和钢轨材料产生相变,从而导致轮轨表面的裂纹、擦伤和剥离破坏.本文首先利用轮对切片投影法计算轮轨接触几何关系;然后利用基于非Hertz滚动接触理论的CONTACT程序计算轮轨接触应力,计算结果能更好的反应轮轨真实的接触状态;最后进行轮轨滑动工况下接触热效应的分析.利用MATLAB软件编制了轮轨接触热效应分析程序,针对不同的摩擦因数和相对滑动速度进行了钢轨表面的温度场分布研究.结果表明：轮轨处于滑动摩擦状态下,热效应明显,在计算轮轨热接触耦合分析时需考虑材料参数随着温度变化的影响;随着摩擦系数和相对滑动速度的增大,热效应越明显.轮轨滑动过程的热效应问题研究将有助于揭示接触过程中的轮轨表面伤损机理.

英文摘要：

Thermal damage is one of the main failure mode of the railway vehicle wheel-rail. When a train emergency braking and accel- erating traction took place in a short time, the pure sliding phenomenon between the wheel and rail is likely to occur on the contact surface, and the slide will lead to a rise in the wheel-rail contact temperature. When they reach a certain temperature to make the phase of wheel and rail materials change, it will lead to the cracks, scratches and stripping damage on the surface of the wheel-rail. The wheel-set axial slice projection method was firstly used to calculate the wheel-rail contact geometry relationship. Secondly, the wheel-rail contact stress calculated by using the program CONTACT based on non-Hertz rolling contact theory can better represent the real wheel-rail con- tact state. Finally, the thermal effect of the wheel-rail contact was analyzed. A analysis program of wheel-rail contact thermal effects was compiled by using MATLAB software. The temperature field was analyzed on the basis of friction coefficient and relative sliding velocity of the wheel-rail. The resuhs show that the thermal effect is obvious, and the effect of the material parameters varying with temperature variation needs to be considered when the wheel-rail is under sliding friction. The thermal effect of wheel and rail is much more obvious as the friction coefficient and relative sliding velocity are increased. The analysis of thermal effect issues of wheel-rail during wheel sliding will help to reveal the wear mechanism of the wheel-rail surface in the contact process.