Fretting Behaviors of Steel Wires with Tensile-Torsional Coupling Force Under Different Wire Diameters and Crossing Angles

Fretting wear among steel wires is one of the important factors for the wire rope fracture. The influence of the wire diameter and crossing angle on the fretting fatigue behaviors of steel wires under tensile-torsional coupling force was explored in the present study. The test principles and analysis methods were introduced. Result shows that the variation laws of the coefficient of friction (CoF) between steel wires with increasing crossing angle under different wire diameter contacts are the same. For the same crossing angle, the CoF under different test conditions increases in the following sequence: both with the diameter of 0.8 mm < both with different diameters < both with the diameter of 1.0 mm. According to the hysteresis loops of the frictional force versus displacement amplitude, the contact area between steel wires with larger crossing angle is easier to enter into partial slip state. Moreover, as the crossing angle increases, the relative amount between steel wires increases in the relatively stable phase, and the wear is more drastic. The main wear mechanisms of steel wires with different wire diameters are fatigue wear and adhesive wear, and the worn surface of steel wires shows more obvious abrasive wear with decreasing crossing angle. Graphical Abstract