Stress analysis and Life Prediction of WJ-7 railway Elastic Strip under Fatigue Load

Abstract

as an important fastener of railway track, the elastic strip connects the rail and the structure under the rail effectively for a long time. Due to the complex and changeable load generated by the track system during train operation, a series of fatigue problems of elastic strip fasteners are caused. The dangerous section of WJ-7 elastic strip is found by numerical simulation with software; Secondly, the three most dangerous points at the dangerous section are selected for static strain electrical measurement test; Finally, the fatigue test is carried out under the buckle pressure of 25kN and the load amplitude of $25\pm 7.5\mathbf{kN}$ to study the relationship between stress and cycle times, and a fatigue life prediction method based on stress change is proposed with the linear cumulative damage theory. The results show that the dangerous section of WJ-7 elastic strip under load is near the large arc at the rear end of the elastic strip; In the fatigue test, the stress life curve of the elastic strip is basically linear; The fatigue life of the elastic strip can be predicted according to the linear cumulative damage theory.