Effects of crack growth on wear mechanisms of brittle materials such as ceramics were evaluated using a testing apparatus having a reciprocal movement at a constant frequency with various normal loads in air. Soda lime glass bars and alumina spheres were mainly used for specimens. The friction and wear behavior showed that the wear of the glass depended on the crack growth near the wear scar and that the coefficient of friction was greater corresponding to the wear rate. Critical stresses for crack growth in sliding contact were determined from indentation damage technique. The crack growth below the wear scar was estimated from inert strength measurements after the friction experiment. The maximum stress at the trailing edge in sliding contact was calculated from elastic contact theory. It was confirmed that the tangential traction at the interface had great influence on the stress at the trailing edge and that crack growth occurred during sliding contact when the stress exceeded the critical value for crack growth.
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