Transformation‐toughened MgO‐partially‐stabilized ZrO 2 exhibits a crack‐wake‐induced load‐point displacement in fracture samples. The equations of linear elastic fracture mechanics were self‐consistently reformulated to include the residual displacement from the transformation wake. Application of these equations to double‐cantilever‐beam specimens of transformation‐toughened ZrO 2 , with the martensitic start transformation temperature close to the testing temperature, gives a decreasing K R curve and initial toughness values near 30Mpa·m l/2 .
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Burns et al. (1986) studied this question.
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