Abstract
Fatigue behavior of ceramic materials, specifically that of an alumina, was studied at both room and high temperatures. Stress-life curves demonstrate reduced lifetime in cyclic relative to static loading at room temperature. Cyclic loading at high temperature with a high frequency and a short duration of maximum stress provided a beneficial effect on failure time in comparison to static loading. Failure time for cyclic loading at high temperatures with a longer hold time at maximum stress was comparable with that in static loading. Microstructural analysis suggests that cyclic fatigue mechanisms at both room and high temperatures may invoke the activities behind the crack tip.
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