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Watanabe, Sota*; Kubo, Koji*; Okajima, Satoshi; Wakai, Takashi
Nihon Kikai Gakkai M&M 2017 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), p.581 - 585, 2017/10
no abstracts in English
Okafuji, Takashi*; Miura, Kazuhiro*; Sago, Hiromi*; Murakami, Hisatomo*; Kubo, Koji*; Sato, Kenichiro*; Wakai, Takashi; Shimomura, Kenta
Nihon Kikai Gakkai M&M 2017 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), p.591 - 595, 2017/10
no abstracts in English
Ando, Masanori; Tsukimori, Kazuyuki; Onizawa, Takashi; Wada, Yusaku
no journal, ,
Based on the "Structural integrity evaluation guideline under sever accident condition" established for the light water reactor at the Japan Society of Mechanical Engineers, nonlinear analysis was conducted on the reactor containment vessel of a fast reactor subjected to the pressure exceeds specificated in design.
Tsukimori, Kazuyuki; Ando, Masanori; Yada, Hiroki; Arakawa, Manabu*; Kitagawa, Keita*
no journal, ,
Bellows with relatively small number of convolutions yields so called in-plane squirm due to over internal pressure. However, still its boundary function is maintained and bulging deformation lasts with increase of pressure until burst occurs. The seamless FEM analysis from in-plane squirm to final bulging becomes very difficult, since many contacts between convolutions occur during this process. In this study to avoid this difficulty, two analysis methods, i.e., implicit analysis with artificially moving bellows end and quasi-static explicit analysis, were tried and their results were discussed compared with experimental results.
Yamaguchi, Yoshihito; Hasegawa, Kunio; Li, Y.
no journal, ,
Influence of magnitude of load amplitude and stress ratio on crack closure behavior for the fatigue crack growth was experimentally investigated by fatigue tests in air environment. Cyclic loads were applied to a specimens and magnitude of load amplitude was stepwise increased under constant load ratio. It was confirmed that an effective load amplitude on fatigue crack growth increases with increasing load amplitude. Then, the effective load amplitude becomes constant value if magnitude of load amplitude is larger than threshold. In addition, the effective load amplitude decreases with decreasing the load ratio. Applicability of fatigue crack growth evaluation method in code and standard for fatigue crack growth under negative stress ratio is discussed on the basis of the experimental results.
Onizawa, Takashi; Wakai, Takashi
no journal, ,
no abstracts in English
Tojo, Takuya*; Yamamoto, Takenori*; Kuroda, Masatoshi*; Aihara, Jun; Tachibana, Yukio
no journal, ,
Fuel compact of high-temperature gas-cooled reactor (HTGR) with inherent safety employs fuel component which was molded from graphite. Development of oxidation-resistant fuel component has been advancing at present, which is fuel component having oxidation resistance formed by SiC. In this study, mechanical properties were obtained on oxidation-resistant fuel components prepared under various molding parameters. Young's modulus was measured by ultrasonic pulse velocity test, and compressive strength was measured by compression test. High correlation was not observed between Young's modulus and hot pressing conditions of temperature and time. There was no correlation between compressive strength and hot pressing time in range of hot pressing temperature of 1573-1873 K and time of 40-120 min, but high negative correlation was observed within range of hot pressing temperatures. Therefore, it was predicted that compressive strength was increased by decreasing hot pressing temperature.