Finite Element Analysis of Metro Rail Clip Spring Bar Fracture under Short-wavelength Corrugation
[Objective] To reduce the impact of rail clip spring bar failure on metro train operation safety, the effect of short-wavelength corrugation on the service performance of rail clip spring bars is investigated and improvement measures to mitigate the clip defects are explored. [Method] Field survey i...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Urban Mass Transit Magazine Press
2025-06-01
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| Series: | Chengshi guidao jiaotong yanjiu |
| Subjects: | |
| Online Access: | https://umt1998.tongji.edu.cn/journal/paper/doi/10.16037/j.1007-869x.20230496.html |
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| Summary: | [Objective] To reduce the impact of rail clip spring bar failure on metro train operation safety, the effect of short-wavelength corrugation on the service performance of rail clip spring bars is investigated and improvement measures to mitigate the clip defects are explored. [Method] Field survey is conducted focusing on the rail clip spring bar service conditions in an urban metro network, the failure modes and occurrence probability of rail clip spring bars are summarized, and the line characteristics prone to such failures are analyzed. A refined finite element model of the DT-III fastener is developed to calculate the vibration modes of rail clip spring bars and the maximum stress location under installation conditions. [Result & Conclusion] Under normal service conditions, significant equivalent stresses of the rail clip spring bars are located on the inner side of the small arc, near the middle limb connection and the iron baseplate respectively. In the installed state, the first-order natural frequency of rail clip spring bars is 642 Hz, which coincides with the passing frequency corresponding to the measured rail corrugation wavelength of 32 mm. The maximum first principal tensile stress occurs on the inner side of the small arc at the middle limb connection of the rail clip spring bar, which is consistent with the actual fracture position observed in the field. Therefore, the short-wavelength corrugation is identified as the main factor introducing rail clip spring bar fracture. It is recommended to strictly control the corrugation within the wavelength range of 30-50 mm to improve the service conditions of rail clip spring bars. |
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| ISSN: | 1007-869X |