Study on the Fretting Wear Evolution Model of Wires with Curvature Inside Metal Rubber

Metal rubber (MR) is a damping material with a space-disordered network interpenetrating structure. The fretting wear and fracture of its internal spiral turn caused by mutual extrusion and friction are the main reasons for its fatigue failure. However, the research on fretting wear of metal wire with curvature inside metal rubber is rarely reported, and the influence of curvature on the fretting wear of spiral metal wire is unclear. In order to deeply explore the fretting wear characteristics of metal wires with curvature, the fretting wear evolution model of metal wires with curvature was deduced and constructed in this work. Combined with finite element simulation and tribological test, the difference of fretting wear between metal wire with curvature and metal wire without curvature was analyzed. The results show that the fretting wear model of metal wire with curvature can accurately predict the wear degree of metal wire with curvature. The prediction accuracy error is within 10% under all working conditions. There are apparent differences between the metal wire with curvature and the metal wire without curvature under the same working conditions. In particular, when the metal wire contacts at a slight angle, the difference in the wear degree between them is extensive, and the error decreases with the increase of contact angle. The fretting wear evolution model of metal wire with curvature is more suitable for predicting fretting wear of metal wire contact pairs, which abound in MR in the form of low contact angle and high curvature.