Fracture Cause Analysis and Treatment Effect for Urban Rail Transit Vibration Damping Track DI-type Elastic Strip

Abstract

Objective Elastic strip is a critical component of rail vibration reduction fasteners, its mechanical performance and fatigue-load bearing capacity are crucial for urban rail transit train operational safety and track service life. Given the frequent occurrence of elastic strip failures, it is necessary to analyze the fracture causes and develop reasonable treatment measures. Method Based on the concentrated fracture of elastic strips in an urban rail transit line section, the fracture type of elastic strips is determined as fatigue fracture through analysis of the breakage. Since chemical composition and physical property analysis of elastic strips fails to reveal any abnormal conditions, the natural frequency of the elastic strips is obtained through simulation and experimental analysis. The vibration characteristics of the track and elastic strips are determined through track dynamic testing in elastic strip fractured section. Based on this, rail corrugation is identified as the main cause of repeated elastic strip fractures. Reasonable treatment measures are formulated accordingly, and the number of elastic strip fractures before and after treatment is statistically analyzed. Result & Conclusion Rail grinding measures can effectively suppress rail corrugation, significantly reducing elastic strip fracture occurrence, further confirming rail corrugation as the main cause of elastic strip fractures.

Keywords

• urban rail transit
• vibration damping track
• di-type elastic strip
• fracture cause
• treatment effect