Abstract
Fatigue tests by using the glass ceramics under two kinds of environmental conditions: air and ion-exchange water. That is to say, for glass ceramic specimens with three collinear cracks that were introduced at different crack center distances by Vicker's indentation, fatigue tests in water environment were carried out under a four-point bending load. The results show that the time to failure for a glass ceramic specimen having small crystal grains was significantly shorter in the water environment than in the atmosphere, whereas in a glass ceramic specimen having large crystal grains, no difference due to the environment can be observed. The prediction of time to failure with crack interaction and crack coalescence was also carried out. The results were in good agreement with the experimental results. The validity of the proposed method of fatigue life prediction was confirmed.
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