Ceramic delayed fracture

T. Okada and G. Sines, Prediction of Delayed Fracture from Crack Coalescence-Alumina, in Fracture Mechanics of Ceramics, Vol. 7. eds. R. C. 

Wang, Y., Peng, X., Chu, W.Y., Su, Y.J., Qiao, L.J., and Gao, K.W., Anisotropy of hydrogen fissure and hydrogen-induced delayed fracture of a PZT ferroelectric ceramic, in Proceedings of the 2nd International Conference on Environment Induced Cracking of Metals, Banff, Canada, October 2004, in press. 

The Kio of the best ZTA composite (AIOZ) is twice that of pure alumina. This means that this nanocomposite is expected to work at loads two times greater than monolithic alumina without any delayed fracture. So, these ZTA composites may offer to improve the lifetime of ceramic and to improve the safety range of use of point prostheses or orthopedic implants [39]. 

Ohji, T. (2003) Delayed fracture behavior of ceramics under tensile loading at elevated temperatures. Journal of the Ceramic Society of Japan, 111 (11), 793-799. 

Brittle fracture mechanics applied to glass and ceramics has proved to be a v aluable research tool. In particular, the v(K ) relationship enables the quantitative description of the mechanism of a delayed fracture.The development of linear elastic fracture mechanics have lead to the possibility of predicting time to failure of brittle materials subjected to stresses lower than their impact strengths. 

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