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Iwata, Koji
Nihon Kikai Gakkai M&M 2011 Zairyo Rikigaku Kanfarensu Koen Rombunshu (CD-ROM), 3 Pages, 2011/07
no abstracts in English
Matsubara, Masaaki*; Hayashi, Tatsuya*; Suzuki, Masato*; Shiraishi, Taisuke*; Sakamoto, Kenji*; Wakai, Takashi
Nihon Kikai Gakkai M&M 2011 Zairyo Rikigaku Kanfarensu Koen Rombunshu (CD-ROM), 2 Pages, 2011/07
In this study, we investigated the influence of two or more flaws on the collapse strength of austenitic stainless steel piping to improve the safety of a nuclear power plant. The multiple flaws may be more often than single flaw. Therefore, it is important to evaluate the collapse strength of the piping with multiple flaws. Piping with a single flaw and multiple flaws were used in the examination. Collapse strength of the piping is verified under the combination condition of tension and bending. It aims to model from multiple flaws to the single flaw for simplification of the. As a result, (1) It is possible to evaluate the collapse strength by identifying the multiple flaws as the single flaw conservatively. (2) On each load condition, the parallel notches on piping can be accounted to be the single notch.
Yamaguchi, Yoshihito; Li, Y.*; Sugino, Hideharu*; Katsuyama, Jinya; Onizawa, Kunio
no journal, ,
In recent years, Japanese nuclear power plants experienced multiple large earthquakes, such as Niigata-ken Chuetsu-Oki Earthquake in 2007 and the Great East Japan Earthquake in 2011. Therefore, it is very important to assess the structural integrity of reactor piping under such a large earthquake when a crack exists in the piping. In this work, An effect of excessive compressive loading on the crack growth behavior of piping materials has been studied through cracked plate testing. It was observed that excessive compressive loading had an acceleration effect on crack growth rate. The evaluation method using J-integral has been proposed for the acceleration effect of crack growth rate. It was indicated that the acceleration effect by excessive compressive loading for the condition beyond small-scale yielding could be conservatively evaluated using the proposed method.
Suzuki, Kenji*; Shobu, Takahisa
no journal, ,
no abstracts in English
Shobu, Takahisa; Tojo, Senta*; Suzuki, Junzo*; Sakaguchi, Yoshiki*
no journal, ,
no abstracts in English