Abstract
A fixture was developed which allows us to test circular discs of high strength ceramic materials under diametral compression. This so-called Brazilian disc test can be used to determine the failure behaviour of natural flaws contained in ceramic materials under multiaxial loading, as a stress state with both negative and positive principal stresses is induced in a disc during the test. The results of the test series performed with low and high strength ceramics are analysed using the multiaxial Weibull theory. Comparison of the Weibull distributions of the fracture stresses obtained with the Brazilian disc test and the outcome of the other test series clearly shows that a shear-insensitive failure criterion is more suitable to determine the critical flaw size under mixed mode loading than a shear-sensitive criterion.
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