Static and Cyclic Fatigue of Alumina at High Temperatures: II, Failure Analysis

Chih‐Kuang Jack Lin, Darrell F. Socie, Youren Xu, Avigdor Zangvil

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)637-648
Number of pages12
JournalJournal of the American Ceramic Society
Volume75
Issue number3
DOIs
StatePublished - Mar 1992

Keywords

  • alumina
  • crack growth
  • fatigue
  • glass
  • high temperature

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