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.
Issue Section:
Research Papers
Keywords:
friction,
wear,
polymers,
prosthetics,
biomechanics,
biomedical materials,
mechanical contact
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.Copyright © 2006
by American Society of Mechanical Engineers
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