- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
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| Citation: | CUI Xiaolu, WAN Jiuyu, PENG Shuangqian, LI Xiang, ZHANG Hongwei, LIU Ning, ZHONG Jianke. Mechanism and Control Method of Rail Corrugation-Induced Clip Fracture in Sections with Double-Layer Nonlinear Vibration Damping Fastener[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240235
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To study the problem of rail corrugation-induced clip fracture in metro sections with double-layer nonlinear vibration damping fasteners, by taking the typical GJ-Ⅲ type fastener as the research object, field investigation and numerical simulation were combined to analyze the causes and influencing factors of fastener clip fracture in this section. Firstly, a finite element model of the wheel–rail–fastener system incorporating rail corrugation was constructed. Subsequently, the instantaneous dynamic analysis method was employed to investigate the causes of fastener clip failure in the rail corrugation section from the perspective of resonance response. Then, based on cumulative fatigue damage theory, the fatigue life of the fastener clips on both sides of the low rail was compared under conditions with and without rail corrugation from the perspective of fatigue characteristics. Finally, a parametric analysis was conducted to explore the influence of external rail corrugation excitation and internal characteristics of fastening components on the fatigue life of the fastener clip. The results show that the high-frequency excitation induced by rail corrugation leads to the resonance in the GJ-III type fastener clip, which is the main cause of the clip fracture. Rail corrugation aggravates the vibration responses of the wheel–rail system, reduces the clip’s service life, and has a more serious impact on the outer clip of the low rail. It cuts the fatigue life to 2.18 × 105 cycles, which is only 4.36% of the design life. In terms of external excitation from rail corrugation, reducing the corrugation depth and increasing the corrugation wavelength can extend the fatigue life of the clip; moreover, when the corrugation wavelength exceeds 40 mm, the fatigue life improves significantly. In terms of the internal characteristics of fastener components, reducing the elastic modulus of the clip, increasing the Poisson’s ratio of both the clip and the rubber pad, and increasing the rubber pad’s elastic modulus can reduce the fatigue damage of the clip to some extent, thereby mitigating clip fracture in the rail corrugation section.
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