K-2306 金属/金属間化合物積層材料における自己高靭化機構(S13-2 多機能・複合機能化への材料協調設計(2))(S13 多機能・複合機能化への材料協調設計)

概要

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Intermetallic compounds are promising materials for structural application. Processing of metal/intermetallic layered materials by self-propagating high temperature synthesis was tried in order to enhance the crack propagation resistance of intermetallics. Tensile test, three-point fracture toughness test and in-situ observation of crack propagation were employed in these materials, and the effect of microstructure and volume fraction of intermetallic layer on the crack propagation behavior was investigated and this paper was aimed at understanding the fracture mechanism of these materials. This paper also describes the self-toughening mechanism in ductile/brittle-layered materials. In order to obtain the materials design ensuring the best performance for the ductile/brittle layered materials, the factors controlling fracture mode, single or multiple cracking, were investigated by numerical analysis. A new method, which can deal with dynamic behavior of crack propagation, was developed to predict crack nucleation toughness and crack propagation resistance. By constructing finite elements containing cracking element in the brittle layer, an in-situ cracking phenomenon was demonstrated successfully.
一般社団法人日本機械学会の論文
2001-08-22