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Determination of Crack Velocity as a Function of Stress Intensity from Static Fatigue Data
Author(s) -
Gupta Prabhat K.,
Inniss Daryl,
Kurkjian Charles R.,
Brownlow Darryl L.
Publication year - 1994
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.1151-2916.1994.tb04619.x
Subject(s) - stress intensity factor , materials science , intensity (physics) , range (aeronautics) , fatigue limit , composite material , stress (linguistics) , fracture mechanics , optics , physics , linguistics , philosophy
The estimation of lifetime of high‐strength (≥1 GPa) glass samples with small cracks at low stress levels (≤ 150 MPa) requires a knowledge of the crack velocity, V , as a function of the stress intensity factor, K , in the range of V values lower than the current limit of measurements (about 10 –11 m/s). It is shown that V(K) data in this range can be obtained directly from static fatigue measurements without assuming a priori any form for V(K) . The method has been applied to the static fatigue data of Proctor, Whitney, and Johnson on silica fibers, and values of V in the range of 10 –11 to 10 –16 m/s (corresponding to K values of 0.35 to 0.20 Mpa·m 0.5 ) are reported.