Abstract
In order to make clear the effect of repetition of loading on Al2O3 ceramics, bending fatigue experiments were carried out under pulsation or reversion of loading with the frequencies of 10Hz, 25Hz and 50Hz, and under static loading in dry atmosphere at 288K. The results are summerized as follows;
(1) Frequency dependence of fatigue life was evidently seen in the case of repetition. Time to fracture was shorter for high frequency.
(2) The fatigue life under reversion of bending was considerably shorter than the fatigue life under the pulsation of bending.
(3) For the same maximum stress level, time to fracture under a pulsation of loading was shorter than that of static loading. At the frequency of 50Hz, the fatigue life was about one tenth of the static case.
