Abstract The paper describes the results of brake dynamometer experiments conducted to evaluate the influence of the tread temperature caused by tread braking on the wear rate of railway wheel tread. Employing a full-scale tread brake dynamometer composed of a brake block, a wheel, and a railwheel, wheel-rail rolling contact was imposed on the wheel tread surface heated under several braking scenarios. In dynamometer tests simulating the braking patterns of an actual vehicle exposed to unexpected hollow tread wear, no tread wear was observed after repetitive station stop braking, whereas tread wear was observed only for the rolling contact region after repetitive holding braking for load cases in which the internal tread temperature reached 300 °C. The wear rate of the rolling contact region was determined for various temperatures by performing experiments in which rolling contact was imposed at a constant tread temperature. The wear rate of the wheel tread increased rapidly with temperature at the tread surface for internal temperatures of 200 °C–300 °C. The wear volume obtained in the experiment was converted and generalized to determine the temperature dependence of the wear rate of the wheel tread as a function of the travel distance. The surface temperature of the tread and the internal temperature distribution were computed by FEM. The maximum temperature on the tread surface was estimated to range from 240 °C to 380 °C. The hollow wear of tread-braked railway wheels is primarily attributed to plastic deformation of the tread surface caused by hot rolling, i.e., rolling under a softened state with an increased temperature of the wheel steel on the tread surface. Verification of thermally activated process using Arrhenius equation confirms this conclusion.

中文翻译：

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带胎面制动的铁路车轮的温度相关磨损

摘要 本文介绍了制动测功机实验的结果，以评估胎面制动引起的胎面温度对铁路车轮踏面磨损率的影响。采用由制动块、车轮和轨道轮组成的全尺寸胎面制动测功机，在几种制动情况下加热的车轮胎面表面施加轮轨滚动接触。在模拟暴露于意外空心胎面磨损的实际车辆的制动模式的测功机测试中，在重复驻车制动后没有观察到胎面磨损，而在重复驻车制动后仅在滚动接触区域观察到胎面磨损，在这些负载情况下，胎面内部温度达到300°C。通过在恒定胎面温度下进行滚动接触的实验，确定了各种温度下滚动接触区域的磨损率。当内部温度为 200 °C-300 °C 时，车轮踏面的磨损率随着胎面表面温度的升高而迅速增加。在实验中获得的磨损量被转换和概括以确定作为行驶距离的函数的车轮踏面磨损率的温度依赖性。通过有限元法计算胎面的表面温度和内部温度分布。胎面表面的最高温度估计为 240°C 至 380°C。胎面制动铁路车轮的空心磨损主要是由于热轧引起的胎面表面塑性变形，即 在软化状态下滚动，胎面表面上车轮钢的温度升高。使用阿伦尼乌斯方程验证热激活过程证实了这一结论。