The effects of contact area and contact stress on friction and wear of polyethylene-metal articulation were evaluated using a bidirectional pin-on-disk apparatus. A doubling of the contact area under fixed loading conditions led to a 50% increase in the coefficient of friction and a doubling of the wear rate. There appeared to be a relationship between the increase in wear rate and the increase in the coefficient of friction. A model was developed to explain the mechanism by which engagement of asperities results in the increasing wear rate with increasing contact area despite the decreased stress.
Contact Area as a Critical Determinant in the Tribology Of Metal-on-Polyethylene Total Joint Arthroplasty
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Mazzucco, D., and Spector, M. (July 6, 2005). "Contact Area as a Critical Determinant in the Tribology Of Metal-on-Polyethylene Total Joint Arthroplasty." ASME. J. Tribol. January 2006; 128(1): 113–121. https://doi.org/10.1115/1.2114930
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