Research On Tangential Fretting Wear Behavior And Numerical Simulation Of5083Aluminum Alloy In Linear Contact

Fretting wear is the repeated cyclical rubbing between two surfaces, which is induced by the vibration with small amplitude. Fretting wear widely exists in aerospace and aviation industry, railway vehicles industry and nuclear power industry, et al. The main influence factors to the fretting wear are as follows:normal load, displacement amplitude, frequency, contact situation, material properties and surface roughness. Until now, most of studies about fretting wear were based on point contact, few study focused on linear contact. Linear contact can be widely found in industrial applications, such as wheel-shaft connection, gear engagement and pin connection. This thesis focued on the tangential fretting wear of5083aluminum alloy against35CrMo steel tribo-pairs under linear contact.This study was carried out in the electromagnetic excitation fretting wear testing machine. The contact situation was linear contact of plane against cylinder, and the analysis was based on friction characteristic curves and coefficient curves. Wear scar morphology analysis, wear volume analysis and cross-section analysis were used to study the influence of both displacement amplitudes and normal loads. To further explained the experimental phenomena, finite element analysis was used to analyze the distribution of stress in contact surface, the influence of friction coefficient and clamping force were considered in this part as well. Through the above work, the results of the thesis were showed as following:1. The running status fretting map of5083aluminum alloy against35CrMo steel under linear contact was obtained. The worn scar appeared to be discontinuous in partial slip status under linear contact. The worn scar showed more serious in slip status in the center of contact line. The SEM results revealed that the mainly wear mechanisms of5083aluminum alloy were abrasive and delamination.2. The wear volume, wear rate and wear depth increased with the increase of the displacement amplitude, the wear loss decreased with the increase of the normal load.3. The stresses along the contact line could be obtained from finite element analysis, the stresses of contact surface increased as the increase of friction coefficient, and the distribution of stresses in contact line was influenced by the fix load.