A simple approach is presented for the determination of crack‐tip‐bridging stresses in ceramic materials. The technique utilizes the difference in compliance predicted for a crack of known size and that measured. The bridging stresses for an alumina material that displays considerable R ‐curve behavior are calculated from measured compliance and crack‐length observations. The results are almost identical with those recently reported in the literature. Additional measurements on a more complex “duplex” ceramic that exhibits a very substantial R ‐curve due to a crack‐branching chain reaction are also presented.
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Hu et al. (1991) studied this question.
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