Abstract
Under static loading, crack formation in titanium carbide is shown to obey Auerbach's law for hemispherical indenters. From the results, using the Frank and Lawn theory of 1967, an estimate of the surface energy of TiC is obtained. In the case of sliding contact the load to fracture varies markedly with the coefficient of friction. A reasonable estimate of the sliding load to fracture is obtained by assuming that the fracture stress, as calculated using the analysis of Hamilton and Goodman in 1966, is the same as in the case of static loading for the same indenter. This is at some variance with the Lawn's 1967 predictions.

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