The crack tip shielding stress intensity factor has been calculated for several elongated transformation zone shapes observed in high‐toughness ceria‐zirconia ceramics. The results show that the measured increases in fracture toughness of these materials are consistent with the crack tip shielding mechanism, to which the toughening of other zirconia ceramics has been attributed. Moreover, the presence of a very elongated zone ahead of a steady‐state crack is shown to decrease the degree of shielding compared with that of a zone with semicircular frontal shape and equivalent width by a factor of about 2.
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David B. Marshall (1990) studied this question.
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