Abstract:In the long-term application of high-speed railway rails in China, number of rail corrugations have occurred. A large number of fastener clips are fractured in the high-incidence section of rail corrugation, which results in serious security risks. In order to study the fracture mechanism of the fastener clips in the high-incidence section of rail corrugation in Chinese high-speed railways. Firstly, the fracture of fastener clips in the corrugation section of the Guangzhou-Shenzhen high-speed railway is investigated. The finite element model of the wheelset-rail-fastener system in the high-incidence area of rail corrugation is established based on the field data. Secondly, from the perspective of resonance characteristics, the vibration characteristics of wheel-rail system induced by the rail corrugation and the natural vibration characteristics of fastener clips are compared. Then, from the perspective of fatigue characteristics, the fatigue life of fastener clips is analyzed based on the linear cumulative damage theory. Finally, some suggestions are presented to restrain the fracture of the clips in high-incidence corrugation sections by controlling the depth of rail corrugation and ensuring the buckle pressure of fastener clips. Results show that the wheel-rail excitation frequency in the high-incidence area of rail corrugation is close to the natural frequency of the fastener clip in the installation state. The resonance phenomenon may be the cause of the fastener failure. The severe vibration caused by wheel-rail excitation sharply reduces the fatigue life of the fastener clips by only 395,000 times, which is significantly lower than the design life requirement of 5 million cycles. The service life of the clips can be effectively guaranteed by controlling the rail corrugation depth and ensuring the normal fastening of the clips.
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