Abstract
The R-curve of alumina could be obtained from Indented beam method. Furthermore the effect of the rising R-curve behavior on the lifetime of fatigue has been investigated by comparing with the experiments and the lifetime predictions obtained by considering the crack growth resistance originated in the R-curve behavior on the K_l-V relation. It was found that the effect of stress cycling on the fatigue would be caused by the reduction of the R-curve by cycling load.
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