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Cracking and the Indentation Size Effect for Knoop Hardness of Glasses
Author(s) -
Quinn George D.,
Green Patrice,
Xu Kang
Publication year - 2003
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.1151-2916.2003.tb03319.x
Subject(s) - knoop hardness test , indentation , materials science , cracking , composite material , indentation hardness , optics , mineralogy , microstructure , geology , physics
The Knoop hardnesses of five glasses decreased with increasing load in accordance with the classic indentation size effect (ISE). At moderate loads, cracking dramatically altered the indentation sizes and the ISE trends in three of the five glasses. Cracked indentations were as much as 10 μm longer than uncracked indentations made under identical conditions. Diagonal length readings must be corrected for optical resolution limitations if low power lenses are used.