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Several polycrystalline ceramics were fractured at room temperature and the fracture-mirror radii were measured. The slopes of curves of fracture stress versus (mirror radius)−1/2 correlate directly with Young's modulus. Comparison of results from strength tests and delayed-fracture tests failed to reveal a loading-rate dependence of the above slopes. Implications of these observations are discussed and a more specific criterion for mirror-boundary formation is suggested.
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