Crack growth resistance curves ( R curves) for the growth of surface cracks have been measured in a series of magnesia‐partially‐stabilized zirconia ceramics with varying degrees of transformation toughening. The shapes of the R curves are correlated with strength‐toughness relations and the predictions of fracture mechanics analysis of transformation toughening. Results support a previous hypothesis that the peak in the strength‐toughness relation is associated with a decreasing slope of the R curve with increasing steady‐state toughness. The role of microstructural influences due to localized regions of transformation on crack growth is assessed, and the relation between reversible and irreversible transformation and toughness is examined.
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Marshall et al. (1988) studied this question.
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