Abstract
Abstract Comparative analyses of torsional fretting, longitudinal fretting, and combined longitudinal and torsional fretting behaviors of steel wires were investigated in the present study. Hysteresis loops of tangential force versus displacement and torque versus torsion angle were explored employing the self-made test apparatus. Wear scars were quantitatively compared using the three-dimensional white light interferometer. Morphologies of wear scars of steel wires were comparatively analyzed to investigate their wear mechanisms employing the scanning electron microscope. Wear coefficients in all three cases were calculated and compared. The results show that the combined longitudinal and torsional fretting presents the largest relative slip (longitudinal and circumferential) and area of hysteresis loop. The wear scar size and wear coefficient of fatigue wire present the largest values in the case of combined longitudinal and torsional fretting as compared to the smallest values during torsional fretting. Meanwhile, combined longitudinal and torsional fretting exhibits the most severe damage at the contact surface.
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