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Controlled Crack Shapes for Indentation Fracture of Soda–Lime Glass
Author(s) -
Smith Stanley M.,
Scattergood Ronald O.
Publication year - 1992
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.1151-2916.1992.tb05618.x
Subject(s) - indentation , materials science , composite material , soda lime glass , fracture toughness , stress intensity factor , fracture (geology) , distilled water , toughness , fracture mechanics , chemistry , chromatography
Radial cracks for indented soda–lime glass aged in distilled water were highly elliptical because of truncation by lateral cracks. Indentation in silicone oil minimized radial/lateral crack interaction but still produced cracks having nominally constant ellipticity during bend testing. Analysis of applied stress/indentation crack length data using stress intensity factors based on half‐penny crack shape resulted in apparent R ‐curve behavior and/or overestimation of the fracture toughness. Incorporation of elliptical shape factors eliminated the R ‐curve behavior and reduced measured toughness to near the accepted value for soda–lime glass.