Friction, Wear, Transfer and Wear Surface Morphology of Ultra-High-Molecular-Weight Polyethylene.
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
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Tribological studies at 25C in a 5O-percent-relative-humidity air atmosphere were conducted using hemispherically tipped 40C HT high temperature stainless steel pins sliding against ultra-high-molecular-weight polyethylene UHMWPE disks. The results indicate that sliding speed, sliding distance, contact stress arid specimen geometry can markedly affect friction, UHMWPE wear, UHMWPE transfer and the type of wear mechanisms that occur. Adhesion appears to be the predominant wear mechanism but after long sliding distances at slow speeds, heavy ridges of transfer result which can induce fatigue-like wear on the UHMWPE disk wear track. In one instance, abrasive wear to the metallic pin was observed. This was caused by a hard particle embedded in the UHMWPE disk wear track. The origin of this particle was uncertain. AN
- Polymer Chemistry