Prediction of static fatigue life of ceramics

摘要

Ceramics are usually used under a load that is much lower than the fracture stress. However, they degrade and finally fracture by fatigue when used for long periods. Alumina, one of the typical structural ceramics, shows fatigue fracture by static loading as well as by cyclic loading [1-5]. The fatigue life of ceramics is generally controlled by the slow crack growth mechanism [6], and the strength degradation o, was derived in a previous study [7] under the stress (7(0 as given in Equation 1,