STUDY ON DETERMINING K_(Ic) OF CERAMIC MATERIALS BY INDENTATION MICROFRACTURE

摘要

In this paper,by studying the accuracy ofindentation microfrature,it is pointed out that the residualstress in the indentation site plays a critical role,whichmakes the theoretlcal analysis extremely difficult and theindentation microcracks slowly expaned,therefore,affectsthe accuracy of measurement.It is concluded that accordingto the microtstructure analysis it is not acceptable to estimatecompletely the accuracy of determining K? by indentationmicrofracture from the point of view of classical fracturemechanics.