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Crack Propagation Behavior of Polycrystalline Alumina under Static and Cyclic Load
Author(s) -
Kishimoto Hidehiro,
Ueno Akira,
Okawara Seiji,
Kawamoto Hiroshi
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.tb05410.x
Subject(s) - materials science , grain size , bridging (networking) , crystallite , composite material , cyclic stress , ceramic , fracture mechanics , alumina ceramic , tension (geology) , metallurgy , ultimate tensile strength , computer network , computer science
Various causes for cyclic‐loading fatigue in ceramics have been proposed. Degradation in the grain‐bridging effect is the most important cause for cyclic‐loading fatigue in nontransforming ceramics. Cyclic‐ and static‐loading crack propagation behavior in terms of crack propagation rate, load—strain curve, and R ‐curve in compact tension specimens of polycrysalline aluminas with two types of average grain size is reported. Significant bridging is observed in coarse‐grained alumina. The results are consistent with the proposal that grain bridging increases with grain size and that degradation in grain bridging is the most important cause for cyclic‐loading fatigue in alumina ceramics.