等価介在物法による破壊靭性に及ぼす弾性不均一性及び残留熱応力効果の解析

概要

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Effects of microstructure on fracture toughness were investigated. Using the equivalent inclusion method, the change in Gibbs' free energy was calculated for a relatively large body containing a main crack and many spherical (or disk-shaped) inclusions with a Young's modulus (or thermal expansion coefficient) different from that of the matrix. Applying the Griffith's fracture criteria to the model, the effects of inclusions on fracture toughness were formulated. The fracture toughness increased with the increase in volume fraction of inclusions with a larger Young's modulus (or thermal expansion coefficient) than that of the matrix. The fracture toughness decreased with the increase in volume fraction of inclusions with a smaller Young's modulus (or thermal expansion coefficient) than that of the matrix. The difference in thermal expansion coefficient influenced the fracture toughness more strongly than that in Young's modulus. The present analysis explains the tendencies of the experimental results reported previously.
社団法人日本セラミックス協会の論文
1992-11-01