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Static and Cyclic Fatigue of Alumina at High Temperatures: II, Failure Analysis
Author(s) -
Lin ChihKuang Jack,
Socie Darrell F.,
Xu Youren,
Zangvil Avigdor
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.tb07853.x
Subject(s) - materials science , cyclic stress , composite material , stress (linguistics) , crack closure , stress intensity factor , failure mechanism , dynamic loading , bridging (networking) , structural engineering , fracture mechanics , engineering , philosophy , linguistics , computer network , computer science
Failure mechanisms of an alumina, tested at 1200°C under static and various cyclic loading conditions, were examined. Slow crack growth of a single crack is the dominant mechanism for the failure in specimens under cyclic loading with a short duration of maximum stress at all applied stress levels, as well as at high applied loads for static loading and cyclic loading with a longer hold time at maximum stress. At low stress levels, failure of static loading and cyclic loading with a longer hold time at maximum stress might occur by formation and/or growth of multiple macrocracks. More importantly, for all the given loading conditions. The viscous glassy phase behind the crack tip could have a bridging effect on the crack surfaces. A simplified model for calculating effective stress intensity factor at the crack tip under static and various cyclic loading demonstrated a trend consistent with the stress–life data.