【摘要】 以高速列车非动力车轴为研究对象，基于车辆轨道刚柔耦合动力学模型、材料力学分析方法、SWT疲劳损伤模型和Miner损伤累计理论，通过计算正常车轮与扁疤车轮作用下的动力学行为和应力应变响应特点，分析车轮扁疤对车轴疲劳损伤的影响。研究结果表明：在车轮扁疤的作用下，轮轨力和轴箱振动加速度的幅值均会显著提升，但一系悬挂垂向力由于垂向减振器的作用导致车轮扁疤对其影响较小；在车辆运行过程中，随着轮对的周期性转动，车轴疲劳损伤在不同滚动周期内的波动较为剧烈，具有正态分布的特点；车轮扁疤的存在会加剧车轴的疲劳损伤，使其服役寿命急剧降低。因此，在车轴的设计阶段，需要考虑扁疤等轮轨缺陷对车轴服役寿命的影响。更多还原

【Abstract】 The non-power axle of the high-speed train was taken as the research object. Based on the rigid-flexible coupling dynamics model of vehicle track, material mechanics analysis method, SWT fatigue damage model, and Miner’s damage accumulation theory, the influence of wheel flat on axle fatigue damage by calculating the kinetic behavior and stress-strain response characteristics under the action of normal wheel and flat wheel was analyzed.The results show that under the action of wheel flat, the amplitude of wheel-rail force and axle-box vibration acceleration will significantly increase, but a series of suspension pendant force due to the role of pendant damper caused by the wheel flat has less effect on it. In the process of vehicle operation, with the cyclic rotation of the wheelset, the axle fatigue damage fluctuation is more intense in different rolling cycles, which has the characteristics of a normal distribution. The existence of the wheel flat will exacerbate the fatigue damage of the axle so that its service life is sharply reduced. Therefore, in the design stage of the axle, it is necessary to consider the influence of wheel and rail defects such as flat on the service life of the axle.更多还原