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Determination of Subcritical Crack Growth Parameters by In Situ Observation of Indentation Cracks
Author(s) -
Dwivedi Priya J.,
Green David J.
Publication year - 1995
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.1151-2916.1995.tb08624.x
Subject(s) - indentation , materials science , crack closure , crack growth resistance curve , residual stress , composite material , crack tip opening displacement , stress intensity factor , in situ , fracture mechanics , structural engineering , chemistry , engineering , organic chemistry
A technique to determine stress intensity factor—crack velocity (K— v ) relationships for subcritical crack growth from in situ observation of indentation cracks is described. To minimize the effect of residual contact stresses and lateral crack interaction, measurements were made only on cracks that had undergone significant subcritical crack growth. Crack shapes were determined fractographically from crack‐arrest markings, produced by temporary unloading during the crack extension process. The subcritical crack growth parameters obtained by this technique were in excellent agreement with those determined from dynamic fatigue and previous studies.