Alumina specimens were fabricated under a wide range of conditions using cold‐pressing and sintering techniques. Fracture energies were measured by an analytical technique (notched beam) and by the Tattersall‐Tappin method. Problems in using the latter method are discussed. The effects of porosity, pore distribution, and grain size on fracture energy are evaluated. Connected porosity has a deleterious effect on fracture energy. A grain‐size effect dominates in dense material; the fracture energy decreases with increasing grain size.
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L.A. Simpson (1973) studied this question.
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