Strength-Size Relationships in Ceramic Materials: 1. Investigation of a Commercial Alumina. 2. Effect of Flaw Shape on Strength of Ceramics.

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Abstract:

Bend strengths of a commercial sintered alumina, 3M Companys Alsimag 614, are reported. Fracture stresses in specimens differing in each linear dimension by a factor of five were measured at room temperature under environmental conditions which either minimized or enhanced subcritical crack growth prior to catastrophic fracture. Strength was found to be dependent on specimen size under both test conditions. Fractographic identification of strength-controlling flaws, coupled with the analysis of strength-size data, indicated a limited applicability of Weibulls statistical approach.

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