OS08W0038 Damage Tolerance Assessment of Synergy Ceramics

Abstract

Synergy ceramics exhibits the nonlinear stress-strain behavior and is expected to have the damage tolerance capability. To assess the enlarged reliability of components of such materials, it is indispensable to evaluate the damage tolerance of the material quantitatively. For this purpose, we develop here a constitutive model of the distributed-micro-crack model where inherent defects involved in the material are modeled by micro cracks with a penny shape and when stress is applied they grow up according to the resistance curve for crack propagation (R-curve). Several calculations are conducted with this constitutive model under various conditions, and referring these results, a standard procedure is proposed to evaluate the damage tolerance of the material experimentally.