各種セラミック材料における強度特性およびその欠陥寸法分布との関係 : 第2報疲労強度

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It is important to predict the S-N curves of ceramics under cyclic loading in their application to machine components. In order to study the cyclic fatigue characteristics of ceramics, the cyclic fatigue testa under 3-point bending were carried out at room temperature in air on the somooth specimens of sintered silicon nitride, partially stabilized zirconia and alumina as well as the pre-cracked specimens of sintered silicon nitride with surface cracks introduced by Vickers hardness indentation. The effect of specimen geometry on the fatigue-life was also investigated by conducting ring compressin testa under cyclic loading on the silicon nitride specimens at room temperature in air. The effect of specimen geometry on the fatigue-life was found to be small for the endurance limit at 10^7 stress-cycles of the case investigated in this study. A large scatter was observed in the fatigue-life of the smooth specimens as compared with that of the pre-cracked specimens. The scatter in the fatigue-file on the smooth specimens may be ezplained from the scatter of the inherent flaw size in the specimens. From the slow crack growth rate determined on the pre-cracked specimens, the S-N curves for the smooth specimens with different size of intial cracks were predicted. Futhermore, the S-N curves for the smooth specimens of the tested materials were predicted on the assumption that the distridution of flaw size of the specimens used for the fatigue testa were equal to that of the specimens for the static fracture tests.
社団法人日本材料学会の論文
1990-10-15

各種セラミック材料における強度特性およびその欠陥寸法分布との関係 : 第2報疲労強度

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各種セラミック材料における強度特性およびその欠陥寸法分布との関係 : 第2報 疲労強度

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各種セラミック材料における強度特性およびその欠陥寸法分布との関係 : 第2報疲労強度