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Abstract
A simple model for failure and wear of continuous unidirectional fiber-reinforced polymer composites with fiber orientation longitudinal (parallel) to the contact plane and sliding direction is presented. Failure or weakening of the immediate surface region, caused by fiber cracking, with subsequent fiber-matrix separation and wear, is the basis for the proposed model. The composite is modeled as an anisotropic (transversely isotropic) half-space whose effective elastic properties are estimated from composite micro-mechanical considerations. The counterface is modeled as an ideal rigid hemispherical indenter sliding against the composite. In this contact configuration, indentation by a hemispherical asperity produces a generally elliptical contact region whose geometry depends on the elastic constants of the composite. The individual fiber is modeled as an infinite beam on an elastic foundation, with the foundation stiffness approximated from the results of the anisotropic contact simulation. From these results, a fiber stress due to deformation and sliding is estimated. In addition, a non-dimensional stress-deformation parameter is presented and compared with steady-state wear rates obtained from existing friction and wear test data in the literature. A rough correlation between the wear rate and the non-dimensional stress-deformation parameter is shown for several composites.
Presented at the 49th Annual Meeting in Pittsburgh, Pennsylvania May 1–5, 1994
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Presented at the 49th Annual Meeting in Pittsburgh, Pennsylvania May 1–5, 1994
