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Machida, Hideo*; Koizumi, Yu*; Wakai, Takashi; Takahashi, Koji*
Nihon Kikai Gakkai M&M 2019 Zairyo Rikigaku Kanfarensu Koen Rombunshu (Internet), p.OS1307_1 - OS1307_5, 2019/11
This paper describes the fracture test and fracture analysis of a pipe under displacement control load. In order to grasp the fracture behavior of the circumferential through-wall cracked pipe, which is important in evaluating the feasibility of leak before break (LBB) in sodium cooled reactor piping, a fracture test in case of a circumferential throughwall crack in the weld line between an elbow and a straight pipe was carried out. From this test, it was found that no pipe fracture occurs in the displacement control loading condition even if a large circumferential through-wall crack (180
) was assumed. The fracture analysis of the pipe was carried out using Gurson's parameters set based on the tensile test results of the tested pipe material. The analytic results agree well with the test results, and it was found that it will be possible to predict the fracture behavior of sodium cooled reactor piping.
Tsusaka, Kimikazu; Koizumi, Yu*; Tanimoto, Chikaosa*; Kameyama, Katsuhiro*; Miyajima, Yasuyuki*
Tonneru Kogaku Hokokushu (CD-ROM), 18, p.77 - 84, 2008/11
In TBM tunneling, secondary fragmentation is considered as a phenomenon that rock pieces between a cutter head and face are fragmented through the excavation process. The fragmentation should cause damage and excessive wear to the disc cutters which pass through the dome-shaped part where scrapers scoop up muck. Based on the cutter replacement records in four TBM applications through sedimentary and granitic rocks, the authors investigated the difference in the rolling distance per unit disc diameter loss between the inner cutters and the outer ones. As a result, it was clarified that the cutter life at the outer part were shorter than that at the inner part by more than 20% by the secondary fragmentation.
Tsusaka, Kimikazu; Tanimoto, Chikaosa*; Nakane, Tatsuto*; Ueno, Takaaki*; Koizumi, Yu*
Dai-37-Kai Gamban Rikigaku Ni Kansuru Shimpojiumu Koen Rombunshu (CD-ROM), p.31 - 36, 2008/01
In the construction of geological repository of high-level radioactive waste, TBM excavation could be one of the most usable tunneling methods to minimize the loosening of rock. The secondary fragmentation has been recognized to have unfavorable influence on the driving, which is defined as a phenomenon that rock pieces between a cutter head and face are fragmented. The chips in the tunneling are well-known for one of useful indices to reflect the geological conditions. The flat and elongated chips indicate the cutting face with less joints and good practice with less secondary fragmentation rate. Through a case history in granitic rock, the authors proposed the new index to estimate the shape of chips and studied the relationship between the index and the excavation efficiencies. In conclusion, it was clarified that chips with the new index over 3.5 were generally observed when a TBM drove with less than 30% the secondary fragmentation rate.
Al conductorKoizumi, Norikiyo; Azuma, Katsunori*; Tsuchiya, Yoshinori; Matsui, Kunihiro; Takahashi, Yoshikazu; Nakajima, Hideo; Nishijima, Gen; Nunoya, Yoshihiko; Ando, Toshinari; Isono, Takaaki; et al.
Fusion Engineering and Design, 58-59, p.1 - 5, 2001/11
Times Cited Count：2 Percentile：19.6(Nuclear Science & Technology)no abstracts in English
Kato, Takashi; Tsuji, Hiroshi; Ando, Toshinari; Takahashi, Yoshikazu; Nakajima, Hideo; Sugimoto, Makoto; Isono, Takaaki; Koizumi, Norikiyo; Kawano, Katsumi; Oshikiri, Masayuki*; et al.
Fusion Engineering and Design, 56-57, p.59 - 70, 2001/10
Times Cited Count：17 Percentile：74.75(Nuclear Science & Technology)no abstracts in English
Tsuji, Hiroshi; Okuno, Kiyoshi*; Thome, R.*; Salpietro, E.*; Egorov, S. A.*; Martovetsky, N.*; Ricci, M.*; Zanino, R.*; Zahn, G.*; Martinez, A.*; et al.
Nuclear Fusion, 41(5), p.645 - 651, 2001/05
Times Cited Count：57 Percentile：83.45(Physics, Fluids & Plasmas)no abstracts in English
S
pulse coilTakahashi, Yoshikazu; Ando, Toshinari; Hiyama, Tadao; Nakajima, Hideo; Kato, Takashi; Sugimoto, Makoto; Isono, Takaaki; Oshikiri, Masayuki*; Kawano, Katsumi; Koizumi, Norikiyo; et al.
Teion Kogaku, 35(7), p.357 - 362, 2000/07
no abstracts in English
Sn conductor joint for ITER model coilsTakahashi, Yoshikazu; Nunoya, Yoshihiko; Nishijima, Gen; Koizumi, Norikiyo; Matsui, Kunihiro; Ando, Toshinari; Hiyama, Tadao; Nakajima, Hideo; Kato, Takashi; Isono, Takaaki; et al.
IEEE Transactions on Applied Superconductivity, 10(1), p.580 - 583, 2000/03
Times Cited Count：20 Percentile：68.87(Engineering, Electrical & Electronic)no abstracts in English
Makino, Yoshinobu*; Goto, Yu*; Kanahara, Toshio*; Nagamoto, Yoshifumi*; Osemochi, Koichi*; Koizumi, Norikiyo; Takano, Katsutoshi; Matsui, Kunihiro; Nakajima, Hideo
no journal, ,
The toroidal field coil is manufactured as one of superconducting coil systems in the ITER. For welding the radial plate of TF coil, the prevention of the welding deformation and the high quality of the joints among the radial plates are required. Moreover, the application of high efficient welding is required in consideration for the productivity. Therefore, 10kW high power laser welding process was investigated for the application to the radial plate welding, because its process is superior in the productivity for the joints and the ease of the control for the heat input. In the experiment, it was confirmed that the application of the high power laser welding with the 6 axes industrial robots is effective in the welding deformation less than approximately 0.5mm for the small model. Finally, the effectiveness of the laser welding for the welding deformation and the weldability on the quality was verified by the real scale test with the actual shape.
Makino, Yoshinobu*; Goto, Yu*; Kanahara, Toshio*; Nagamoto, Yoshifumi*; Osemochi, Koichi*; Koizumi, Norikiyo; Takano, Katsutoshi; Matsui, Kunihiro; Nakajima, Hideo
no journal, ,
no abstracts in English
