Abstract
The fracture toughness of stoichiometric mullite samples having three different microstructures was examined by using the chevron-notched specimen technique and Vickers indentation method. The results obtained by these procedures were compared with each other, mainly focussing on the applicability of the current equations for the fracture toughness evaluation by the indentation method. Among them, the most preferable equation was finally confirmed along with some fundamental requirements to measure the fracture toughness through this convenient technique. Furthermore, the effects of microstructure on the crack growth resistance and the fracture toughness were discussed based on the experimental results.
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