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Cyclic fatigue testing of silicon nitride ceramics was performed at a frequency of f = 150 Hz and a stress ratio of R = 0.1 using a piezoelectric bimorph fatigue device. Based on the method proposed by Fett and Munz, a fatigue crack growth diagram ( K 1 – V diagram) was estimated from fatigue lifetime distribution data. A change in the slope of the K I – V diagram was observed. A statistical analysis for predicting the lifetime of ceramics exhibiting a transition in a K I – V diagram was devised on the basis of this observation. Analytical results obtained with this method showed good agreement with experimental data.
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Ogasawara et al. (1994) studied this question.
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