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Crack‐Resistance Curves of Surface Cracks in Alumina
Author(s) -
Steinbrech Rolf W.,
Schmenkel Olaf
Publication year - 1988
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.1151-2916.1988.tb05078.x
Subject(s) - materials science , composite material , crack growth resistance curve , surface (topology) , bar (unit) , enhanced data rates for gsm evolution , crack closure , residual stress , residual strength , fracture mechanics , geometry , mathematics , geology , telecommunications , oceanography , computer science
The resistance of coarse‐grained alumina to stable crack growth, initiated from “naturally’occurring surface flaws, was studied in strength tests with a bend‐bar technique. The surface cracks experienced R‐curve behavior over the first few hundred micrometers; i.e., the applied crack driving force had to be increased with crack extension. Compared to R curves generated from long cracks in standard single‐edge‐notched‐bend specimens, the surface‐crack curves have lower initial values. The possible influence of localized residual stresses, counteracting the applied crack driving force, is discussed.