Influence of Shielding on the Subcritical Crack Propagation in Zirconia Ceramics

摘要

The influence of crack tip shielding by phase transformation on the fatigue crack behaviour of zirconia ceramics is analysed. The improvement in fatigue resistance by transformation toughening is estimated by a simple linear analytical expression for the development of toughening from which analytical expressions for fatigue life are derived. The results are qualitatively similar to those obtained by using a more realistic expression for shielding based on the measured R-curve under monotonic loading.