Discrimination of failure criteria with ceramic rings subjected to internal pressure

An experimental procedure for gathering short-time strength data and to discriminate multiaxial failure criteria of ceramics is presented. It uses concentric rings of different diameter ratios which are subjected to internal pressure and allows specimen to have “as-fired”-surfaces. Due to mainly tensional stresses, crack-face friction effects in the material have minor influence on the discrimination of failure criteria. Test series with alumina have been executed and the results are presented.