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International Society of Science and Applied Technologies |
| Reliability Modeling of Fixed Frogs in Heavy-Haul Railway System under Dependent Competing Failures | ||||
| Author |
Jiaqiang Wang
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| Co-Author(s) |
Wei Yang; Jinduo Xing
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| Abstract | This study investigates the reliability of heavy-haul railway fixed frogs subjected to coupled degradation and shock effects. A dependent competing failure model is developed to characterize wear degradation and crack growth, incorporating a zonal shock model that includes both extreme and cumulative shock types. In the proposed framework, degradation influences shock arrival rates and magnitudes, while shocks, in turn, accelerate degradation progression. System reliability is evaluated through Monte Carlo simulation, using a 60 kg/m No. 9 turnout with a cast high-manganese-steel fixed frog as a case study. The results indicate that crack-related failures cause an early reduction in reliability, whereas wear becomes the dominant failure mode toward the end of service life. Shock-induced failures lead to a continuous decrease in reliability from the outset of operation. Furthermore, a stronger degradation–shock dependence significantly degrades system reliability. The proposed model establishes a foundation for reliability assessment of fixed frogs under heavy-haul operating conditions.
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| Keywords | Fixed frog, heavy-haul railway, dependent competing failure, degradation-shock dependence, Monte Carlo simulation | |||
| Article #: RQD2026-284 | ||||
Proceedings of 31st ISSAT International Conference on Reliability & Quality in Design |