Zhu Ping  Lin Zhongqin  Chen Guanlong  Lai Xinmin

Key School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200030, China

Kiyohiko Ikeda  Koichi Kaizu

 Miyazaki University, Japan

Abstract:  The lifetime prediction of ceramics is discussed on the basis of the relationship between stress intensity factor K_I and crack velocity v. The effects of water environment, the cyclic loading and microstructure of material on K_I-v characteristics are studied by carrying out the crack growth tests by the double torsion (DT) method under the static and cyclic loading in both environments of air and water for alumina and zirconia. K_I-v characteristics determined by the double torsion method are used to predict time-to-failure under the cyclic loading of alumina and zirconia ceramics. The predictions agree qualitatively with the experimental results.

Key words: Alumina  Zirconia  Fatigue  Crack growth  Lifetime prediction

* Selected from Proceedings of 2000 the First International Conference on Mechanical Engineering; revised manuscript January 21, 2002

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