Towards Prediction of Thermally Induced Microcrack Initiation and Closure in Porous Ceramics

摘要: This article describes development of a model to predict microcrack density evolution as function thermal history in porous ceramics with anisotropic expansion coefficients. The is based on the statistical distributions grain-boundary stresses and crack opening displacements (CODs), represents universal cracking closure behavior scaled by coefficients that depend microstructure material properties. functional forms for this were developed from 2D finite element simulation thermally induced microcracking. Specifically, CODs studied, parameter describing each quantity was calibrated modulus hysteresis data. An additional calibration also introduced link macroscopic behavior. applied experimental results cordierite ceramic shown accurately describe its