Abstract
The dependence of KIc on the notch‐root radius has been examined for a notch radius as small as a few micrometers in a dense, fine‐grained, polycrystalline alumina ceramic. The notch radius can be systematically varied by using a semimanual procedure in a special jig which polishes out rather than cuts the specimen. KIc is independent of the notch sharpness for notch‐root radii < 10 μm. The results are critically compared with those obtained by other standard techniques and discussed in terms of residual compressive stresses introduced during the notching procedure.
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