Bend strengths of two sizes of specimens of an alumina ceramic were determined under conditions that either enhanced or restricted sub critical crack growth. The specimen sizes differed in each linear dimension by a factor of five and the effective size of small specimens was varied by the use of both 3‐ and 4‐point bending. Strength was dependent on specimen size under both crack‐growth conditions, and the dependence was associated with variations in flaws at fracture origins. The experimental data were analyzed for applicability of Weibull's statistical relations and in terms of fractographic examinations of strength‐controlling flaws.
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Bansal et al. (1976) studied this question.
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