To analyze the reasons for the fracture of fastener clips in high-speed railway operating lines

SKL15 clips were studied as the object using a method of combining field test and simulation analysis. First

an on-site investigation of rail corrugation and vibration response characteristics of clips was performed. Then

a finite element model of the fastening system was established. The modal characteristics of the clips in their free and assembly states were analyzed

and a harmonic response analysis was carried out based on the modal superposition method. The reliability of the model was proved by comparing the field test results with the simulation results. Finally

in combination with the test results and the railway operation situation

the fracture causes of the fastener clips were analyzed

and remedial measures were put forward. Results showed that the main reason for the fracture of clips was that the load frequency excited when the train passed through the corrugation section with a significant wavelength of 50-60 mm at a speed of 120 km/h was very close to the modal frequency (550–650 Hz) of the clips in the assembly state

which caused the clips to have a strong resonance effect and resulted in the significant increase in the stress at the heel end of the clips

and eventually

fatigue damage. As a result

some solutions were put forward

such as rail grinding

train speed adjustment

and clip structural optimization.