Simulation research on fretting wear of train axles with interference fit based on press-fitted specimen

Abstract

Based on dimensional analysis and similarity theorem, this paper deduces the scaling relationship considering the fretting fatigue problem of the wheel and axle, and verifies it through finite element simulation analysis. A finite element model of a 1/10 reduction ratio press-fit specimen was established to simulate the fretting characteristics of the interference fit of the train axle, and the ABAQUS finite element software combined with the Fortran wear subroutine Umeshmotion was used to apply the rotational bending load. Only considering the cumulative effect of fretting wear in the slip zone, the variation characteristics of the wear width and depth of the specimen shaft with the number of load cycles were studied. The simulation results show that the fretting wear area and wear depth increase with the increase of the number of load cycles, and the axial width of the wear area of the contact surface is about 0.2 mm; the existence of the overlap of the specimen hub can restrain the position of the contact edge of the specimen shaft fretting wear effect. This makes the maximum wear depth of the specimen shaft occur at 0.03 mm from the contact edge, while the maximum wear depth of the specimen hub contact area occurs at the contact edge.