Abstract
It is demonstrated that the wear equation based on the concept of repetitive loading of surface asperities in sliding can be used to estimate the wear of polymeric materials. Wear and surface topography data for poly(methyl methacrylate), poly(vinyl chloride) and high density polyethylene pins sliding against a hardened and ground AISI 4340 steel disk are reported. The fatigue data for these polymers were obtained by using notched cylindrical specimens in a rotating beam fatigue-testing machine and were fitted to the Wöhlers equation N = ( S 0/ S) t . The wear equation was solved by assuming the gaussian distribution for asperity heights and involves a parabolic cylinder function in its solution. The procedure to compute the wear rate from the fatigue wear equation is described and the wear rates computed from the fatigue and surface topography data are reported. It is found that the computed steady state wear rates are in excellent agreement with the experimental wear rates for the three polymers tested.
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