Prediction of Lifetime for Ceramic Materials in the Elastic and Viscoelastic Region by Fracture Mechanical Methods

摘要

The effects of subcritical crack growth on the life of ceramic materials under static bending loads, and the feasibility of making life predictions were investigated. Formulas for life and dynamic bending strength are discussed. A method for the solution of cases involving creep behavior, enabling usable predictions to be made is proposed. For linear-elastic behavior, experiments on Al2O3 and HPSN reveal good agreement between predicted and measured lives. If creep predominates, the range of lives to be expected and the qualitative shape of their distribution can be correctly predicted.