原子炉圧力容器用鋼の破壊靱性挙動とその考察

概要

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A drop weight J_<Id> testing machine has been developed successfully, by which the multiple specimen J resistance curve test technique can be applied to measure the fracture toughness. In this study, the use of a small size round compact tension (RCT) specimen for measuring the fracture toughness J_<Ic> or J_<Id> of the nuclear pressure vessel steels is recommended and confirmed for the surveillance tests. The static and dynamic fracture toughness of ASTM A508 C1.2, A508 C1.3 and A533 Gr.B C1.1 steels in the wide range of temperature including the upper shelf have been measured and their behavior has been analysed. The fracture toughness behavior under various strain rates and in a wide temperature range can be explained by the behavior of stretched zone formation preceding the crack initiation. The scatter of K_J values in the transition range is caused by the amount of crack extension contained in the specimens. In this paper, the method to obtain the fracture toughness equivalent to the K_<Ic> from the K_J value is also presented.
社団法人日本鉄鋼協会の論文
1983-02-01