Abstract
An investigation was carried out in order to develop a sphere indentation method for evaluating microfracture strength of surface layers of structural ceramics. Indentation tests on Si3N4 plates using a Si3N4 spherical indenter as well as conventional bending tests were carried out. The relationship between the ring crack initiation strength evaluated from indentation tests and bending fracture strength was examined using the concept of effective area based on the Weibull distribution. The indenter size dependence of the ring crack initiation strength was also examined using the same concept.
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