等価介在物法による破壊靱性の気孔率・気孔形状依存性の解析

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 micropores (or penny-shaped microcracks). Applying the Griffith's fracture criteria to the model, the effects of micropores (or microcracks) on fracture toughness were formulated. The fracture toughness decreased with the increase in volume fraction of micropores (or microcracks). Furthermore, the fracture toughness of a body with microcracks, depended on the volume fraction more remarkably than that with micropores. The tendencies of the experimental results reported previously, were explained by this theoretical analysis.
社団法人日本セラミックス協会の論文
1991-09-01