A Comparative Study of Fretting Wear Behavior of Hollow and Solid Railway Axles

The finite element (FE) simulation model of fretting wear of press-fit part of the axle was established, the change of wear profile with the load cycle was studied. The fretting wear behavior of the hollow and solid axle and its influence on the contact parameters were compared and analyzed. The simulation results show that the stress concentration near the contact edge of press-fitted part is gradually relieved owing to fretting wear, while a new stress concentration appears at the worn-unworn boundary. With the increase in fretting cycles, the width of the fretting wear scar increases, resulting in the stress concentration away from the contact edge. In the region near the contact edge, the slip amplitude of hollow axle is larger than that of solid axle, which leads to the fretting wear of hollow axle is larger than that of solid axle.