Research and analysis of elastic strip fatigue under stress controlled loading mode.

Fastener technology is a key technology of Ballastless track structure in high-speed railway, and the elastic strip is the key component to realize fastener function. To this end, a special loading fixture is fabricated to explore the performance of the elastic strip under fatigue load. The working state of the elastic strip was simulated through the fatigue testing machine, and the stress-controlled loading modes and four loading amplitudes (25±5kN, 25±7.5kN, 25±10kN, 25±12.5kN) are investigated. The pressure control method is used for fatigue tests, and the results show that: (1) As the load amplitude increases, the fatigue life decreases sharply and its decreasing speed is greater than the increasing speed of load amplitude; (2) The buckling pressure and displacement curves of the elastic strip have the characteristics of "increasing step-by-step" and "decreasing step-bystep"; (3) In the fatigue test, the attenuation of buckling pressure is 22% - 33% and the displacement at the front end of the ring is 18% - 25%; (4) According to the results, the buckling pressure curve and the displacement curve of the ring in the elastic strip are drawn, and the equations of them are fitted to estimate the service performance of the elastic strip. [ABSTRACT FROM AUTHOR]