Fatigue behavior of structural ceramics at elevated temperature.

概要

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The fatigue behavior of structural ceramics was examined at elevated temperature. The fatigue of silicon carbide depends on the loading time, but does not depend on the number of loading cycles. The fatigue is observed in air and the lifetime can be represented using Larson-Miller plots, but the fatigue behavior is observed in a vacuum. These results show that the thermal activated oxidation seems to be dominant in the elevated temperature fatigue process.The crack growth in the fatigue process consists of three stages. In the first stage the crack shows a rapid growth rate, but the growth rate decreases in the second stage. In the third stage, a rapid growth rate or an arrested behavior of the crack is observed according to the level of loading stress. Under a certain level of stress, the crack can not become unstable because of healing effect, so that the existence of fatigue limit is recognized.A new design rule for fatigue at elevated temperature is proposed based on the fatigue limit.
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