Successful development of diamond coated tooling requires a quantitative measurement of adhesion between diamond and cemented carbide. The brale indentation method is explored whereby a circular interface crack is created under applied load. A model is presented which focuses on the plastic deformation near the indentor that results in mode I loading of the film. In particular, an Obreimoff-type analysis is used to relate interface toughness to the plastic deformation near the indentor, film thickness, Young's modulus, and applied load.
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