• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2025, Vol. 61 ›› Issue (20): 103-112.doi: 10.3901/JME.2025.20.103

Previous Articles    

Research on Thermal Fatigue Crack Opening and Closing Behavior of Railway Brake Disc Based on the Virtual Crack Closure Technique

HE Jiahuan1, SHEN Jiacheng1, LU Chun1,2, ZHAO Jie1, YUAN Bo3   

  1. 1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031;
    2. Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province, Chengdu 610031;
    3. CRRC Qiqihar Rolling Stock Co., Ltd., Qiqihar 161002
  • Received:2024-11-05 Revised:2025-08-19 Published:2025-12-03

Abstract: The propagation of thermal fatigue crack is the main reason of railway brake disc damage and even failure. In order to study the crack opening and closing state, contact state of crack surface and crack propagation behavior, the virtual crack closure technique and finite element secondary development are combined to analyze the finite element model of the brake disc with prefabricated cracks. The results show that the presence of surface crack of the brake disc has no significant effect on the compressive stress field during braking, but it affects the distribution of residual tensile stress field, and the stress concentration phenomenon appears at the crack front. During the braking process, the normal contact pressure between the crack surfaces of the brake disc changes layer by layer along the crack depth direction from the friction surface, and the relative magnitude of the normal contact pressure between the surface and the deep changes. The normal relative displacement between the crack surfaces of the brake disc diffuses from the crack center to the crack front in a shell shape, and gradually increases to the maximum with the cooling process. With the crack propagation, the crack opening time of the brake disc gradually delays and the crack appearance tends to flatten.

Key words: brake disc, thermal fatigue crack, virtual crack closure, crack propagation, finite element analysis

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