Fretting Wear Damage Characteristics of Carbon Fiber

The fretting of carbon fiber was produced on the self-made multi-function fretting corrosion tester, by changing the normal load and the displacement amplitude. The running condition fretting map, F_t-D curve and friction coefficient curve were established. The fretting wear operation characteristics of carbon fiber were explored; combined with optical microscope, scanning electron microscope, white light interferometer and X-ray photoelectron spectroscopy. The fretting wear mechanism of carbon fiber was explored by the investigating wear morphology and wear components. The results show the transition of fretting wear regime from partial slip regime or mixed regime to slip regime was observed by decreasing normal load and increasing displacement amplitude. Increasing normal load and decreasing displacement amplitude decreased the friction coefficient. Wear volume increased with increasing normal load and displacement amplitude. In the partial slip regime and the mixed regime, the wear rate decreased with the increase of the normal load. In the slip regime, the wear rate fluctuated and increased with normal load. The wear mechanisms of the mixed regime and the slip regime were abrasive wear, delamination and oxidative wear, while the oxidation wear in the mixed regime was more severe. The displacement amplitude and normal load had a great influence on the fretting wear of carbon fiber, friction coefficient and wear volume. The fretting wear mechanisms of the mixed regime and the slip regime were mainly represented by abrasive wear, delamination and oxidative wear.