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Torsional fretting tests of UHMWPE against titanium alloy ball (TC4) had been carried out. A frictional torque–angular displacement (T–θ) curve was used to analyze the kinetics behaviors of torsional fretting mode. The wear morphology and damage mechanisms of UHMWPE were studied based on examinations by scanning electron microscopy (SEM). It is found that the contact stiffness and friction-dissipated...
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