Abstract
Abstract Fracture mirror radii (r m) of strong, fine-grained alumina ceramics were measured and correlated with the fracture stress (σ f ) to show that the relation σ f rm 1/2 = constant, previously established for glass, applies for alumina ceramics at room temperature and at elevated temperatures. The mirror measurements were used to estimate the residual stresses in quenched alumina rods and to construct a residual stress profile. Using this stress profile and the local stress due to the applied load, the stresses acting to cause fracture at internal flaws in the quenched rods were estimated. These results show that the local stresses causing fracture decrease with increasing relative distance from the rod axis.
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