Solid spherical glass particle impingement studies of plastic materials

Summary Optical and scanning electron microscope studies were conducted to characterize the erosion resistances of polymethyl methalcrylate (€“MA), polycarbonate, and polytetrafluoroethylene (PTFE). Erosion was caused by a jet of spherical glass beads at normal impact. During the initial stages of damage, the surfaces of these materials were studied using a profilometer. Material buildup above the original surface was observed on polycarbonate and PMMA. As testing progressed, this buildup disappeared as the erosion pit became deeper. Little or no buildup was observed on PTFE. PTFE is the most resistant material and PMMA the least. At early stages of damage and at low-impact pressures, material removal mechanisms appear to be similar to those for metallic materials. The flake-like debris observed on the surface, which is indicative of deformation wear by repeated impact and eventual fatigue, caused material loss. At higher impact pressures, evidence of surface melting was noted, and it is believed to be the result of heat generated by impact. polypropylene (refs.

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