Abstract
In order to study the influence of cyclic load on the crack propagation behavior of sintered alumina, static and cyclic fatigue crack growth tests were carried out over a wide range of fatigue crack growth rates. In the case of cyclic load, crack growth tests were conducted at a constant stress ratio R(=0. 1) and at three levels of frequencies f : 1 Hz, 10 Hz and 50 Hz. Further tests were carried out at a constant f(=10 Hz) and at three levels of R : 0. 1, 0. 5 and 0. 8. The crack growth rate da/dN as independent of frequency. In cases of R : 0. 1 and 0. 5, the crack growth rate in cyclic fatigue was higher than that in static fatigue. In the case of R=0. 8, the crack growth rate in cyclic fatigue was almost identical to that in static fatigue. The effective stress intensity factor range ΔKeff is also a useful parameter to evaluate the cyclic fatigue crack growth characteristics.
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