Abstract
A theoretical model has been developed to predict the erosive wear behaviour of elastomers under conditions of normal impact. It is also relevant to the growth of fatigue cracks in rubber due to repeated indentation. The wear mechanism in erosion involves the propagation of fatigue cracks under the influence of frictional stresses arising from particle impact. The predictions of the model were compared with experimentally-measured wear rates for natural rubber, styrene-butadiene rubber and a highly cross-linked polybutadiene rubber eroded by irregular quartz sand and round glass beads. Good qualitative agreement was obtained between the predicted and observed effects of impact conditions (particle velocity, size and coefficient of friction) and materials properties (elastic modulus and fatigue properties). Quantitative agreement was only fair, however, with absolute values being typically predicted to within an order of magnitude. Possible reasons for these discrepancies are discussed.
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