347 酸化ジルコニア粒子含有インテリジェントマテリアルの自己き裂閉鎖機構のマイクロメカニックス解析

概要

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In a ceramic material containing tetragonal ZrO_2 particles, a crack will be in self-closure due to dilatational transformation strain induced in both a process zone and its wake surrounding the crack by enhanced stress at the vicinity of the tip of crack. Therefore such a ceramic material can be regarded as an intelligent material which self-contains elements that play roles as a sensor to detect cracks in the material and an actuator to heal them. In this study, micromechanical analysis on the toughness of a ZrO_2 particles/alumina will be performed by modeling a crack in the material and a zone wake surrounding the crack as a ellipsoidal double inclusion which consists of a nested sequence of two inclusions whose eigenstrains are different from each other. Energy release rate of crack and absorbed energy rate during the transformation of particles will be derived and then net stress intensity factor K_I will be formulated as a function of the thickness of zone wake and the volume fraction of particles. By using the resulting expression for K_I, effects of the zone wake size and volume fraction of particles on the toughness of ZrO_2/alumina will be examined.
一般社団法人日本機械学会の論文
2000-07-31