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Controlled Flaws in Ceramics: A Comparison of Knoop and Vickers Indentation
Author(s) -
MARSHALL DAVID B.
Publication year - 1983
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1983.tb09989.x
Subject(s) - knoop hardness test , indentation , materials science , brittleness , vickers hardness test , composite material , deformation (meteorology) , residual stress , ceramic , fracture (geology) , indentation hardness , microstructure
Application of indentation fracture analysis to Knoop and Vickers indentation is examined, with particular emphasis on determining the limitations of the point force representation for the residual stress field. Deviation from the point force approximation is insignificant for crack‐size/plastic‐zone‐size ratios 1.3. The Vickers deformation/fracture configuration in brittle materials invariably conforms to this requirement, whereas the Knoop configuration does not (except at very high indentation loads). However, stable crack growth during a failure test extends the crack sufficiently that the strength degradation for both types of indentation is well described by the point force approximation.