部分安定化ジルコニアの疲労寿命増大効果に及ぼす予負荷応力の検討

抄録

In our previous study the method adding pre-loading stress before cyclic loading were suggested to improve the degradation in cyclic fatigue life-time of partially stabilized zirconia. The test results indicated that the method could make the lifetime appreciably increase in cycling fatigue with a low applied stress. However, it is necessary to know whether there would be an optimum pre-loading stress to strengthen the transformation zone. From the view point, in this study the cyclic fatigue lifetimes under various pre-loading stresses and pre-loading methods were examined. Experiments and SEM observations showed that there is the optimum pre-loading stress which produces a pertinent coexistence of micro-cracks and transformed particles within transformation zone.