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It is necessary to develop the estimation method of fracture toughness at arbitrary strain rates because fracture toughness for most metals under high strain rates such as impact loading is lower than... static fracture toughness. As a result of two dimensional FE analyses, it turned out that the strain rate-temperature parameter (R) keeps a certain constant value in fracture process zone at an arbitrary moment of loading process. Based on this result, we postulated that fracture toughness is a function of R value in a fracture process zone. Using this hypothesis, we developed the estimation method of fracture toughness under arbitrary strain rates. Failure analysis for brittle fracture of two kinds of structures were carried out. As a result of these analysis, we found evidence of the validity of this brittle fracture evaluation method. In addition, the up-to-date Japanese activities of the assessment of brittle fracture of structures under seismic wave were mentioned briefly.続きを見る
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Mendeley出力
