Abstract
Abstract Strength data obtained from uniaxial and biaxial bend tests on two alumina ceramics have been analysed by means of a weakest-link model with different mixed-mode fracture criteria and crack shapes. Taking the data from three- and four-point bend tests as a reference, strength predictions for the ball-on-ring and ring-on-ring biaxial tests were made, showing large differences in the predictions for the different fracture criteria. The best fitting models for the two aluminas cannot be interchanged, thus showing a marked difference in their shear stress sensitivity. Analysis shows that in general a combination of tests with a varying degree of stress multiaxiality is required to determine the best applicable mixed-mode fracture criterion.
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