Analysis of Multiple Parallel Radial Crack Propagation Behavior of High-speed Train Brake Discs

doi:10.3901/JME.260160

Abstract

Abstract: As one of the key components of the train’s basic braking system, the brake disc may develop widespread fatigue cracks on its surface during repeated braking processes, posing a threat to train safety. The multiple cracks on high-speed train brake discs surface are studied through thermo-mechanical finite element simulation and virtual crack closure technology, and the interaction between multiple parallel radial cracks on the disc surface is studied. The influence of crack spacing on the radial crack propagation behavior of the brake disc surface is analyzed from the aspects of stress distribution, opening displacement distribution, stress intensity factor, and crack propagation rate. Research has found that multiple cracks can slow down crack propagation by affecting the stress and displacement fields around the crack, but they do not affect the opening time of the crack. As the spacing between parallel radial cracks increases, the mutual influence between multiple cracks will weaken. Under the calculation conditions in this article, when the crack spacing is greater than 20 mm, the presence of multiple cracks has a relatively small impact on the radial propagation behavior of the main crack. When the crack spacing is greater than 30 mm, the presence of multiple cracks has little effect on the propagation behavior of the main crack along the depth direction. When the crack spacing is 5 mm, the propagation rates of radial cracks at the front, bottom, and rear ends decrease by 58%, 81%, and 54%, respectively.

Key words: brake disc, crack propagation, virtual crack closure, multiple cracks, radial crack

CLC Number:

U270

LU Chun, HE Jiahuan, TENG Wanxiu, LIANG Hongqin, WEN Zefeng, DENG Yongquan. Analysis of Multiple Parallel Radial Crack Propagation Behavior of High-speed Train Brake Discs[J]. Journal of Mechanical Engineering, 2026, 62(14): 160-169.

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