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ÖÐͼ·ÖÀàºÅ£ºU213.5+3 ÎÄÏ×±êÖ¾Â룺A doi£º10.3969/j.issn.1006-0316.2023.04.006

ÎÄÕ±àºÅ£º1006-0316 (2023) 04-0038-07

Research on the Fracture Mechanism of the Fastener Clip of the Urban Express Line

LIAN Ziyang1,2

( 1.China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China; 2.Hubei Key Laboratory of Railway Track Security Service, Wuhan 430063, China )

Abstract£ºDuring the operation of an urban express line in the country, the fastener clips were broken. In order to explore the fracture mechanism of the clip, a finite element model of the clip is established, and the stress characteristics and vibration characteristics of the clip are studied. The stress characteristics of the clip under different installation states are analyzed, and the relationship between the fatigue life of the clip and the installation state is studied through the fatigue prediction method. According to the modal analysis and the harmonious response analysis of the clips, and combined with the field test data, it is verified that the first-order natural frequency of the clip is located in the characteristic peak range of the passing frequency of the rail surface roughness, which is easy to cause resonance that aggravates the high-frequency vibration of the clip and induces fatigue cracks. On the basis of the analysis and calculation results, the maintenance and repair measures to optimize the working state of the clips are proposed, such as standardizing the installation of the fasteners, correcting the positional deviation of the clips in time, and strengthening the grinding of the rails.

Key words£ºclip£»stress characteristics£»fatigue life£»natural frequency£»resonance

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