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Maeyoshi, Yuta*; Takano, Katsuyoshi*; Asano, Atsushi*; Marui, Hiromi*; Omichi, Masaaki*; Sato, Takahiro; Kamiya, Tomihiro; Ishii, Yasuyuki; Okubo, Takeru; Koka, Masashi; et al.
Japanese Journal of Applied Physics, 51(4R), p.045201_1 - 045201_4, 2012/04
Times Cited Count：1 Percentile：4.43(Physics, Applied)Asano, Wataru*; Katsuyama, Jinya; Onizawa, Kunio; Mochizuki, Masahito*; Toyoda, Masao*
Proceedings of 2008 ASME Pressure Vessels and Piping Division Conference (PVP 2008) (CD-ROM), 8 Pages, 2008/07
Stress corrosion cracking near welding zone of core internals and/or recirculation pipes of Type 316L stainless steel are initiated and grown at inner surface due to tensile residual stress and hardening. Surface-machining is conducted before and after piping butt-welding to match the ID of pipes and to provide a smooth surface finish, respectively. In present work, simulation evaluated residual stress by surface-machining before welding by using full scale FEM analysis was compared with experimental measurements. Piping-butt welding simulation was conducted after the surface-machining to evaluate redistribution behavior of residual stress by welding. Estimation of Vickers hardness distribution by surface-machining was carried out based on strained region map observed by FE-SEM equipped with EBSD and compared with experimental measurements. The effect of surface-machining before/after welding on distribution of residual stress and hardening are presented.
Katsuyama, Jinya; Mochizuki, Masahito*; Mori, Hiroaki*; Asano, Wataru*; An, G. B.*; Toyoda, Masao*
Materials Science Forum, 580-582, p.573 - 576, 2008/00
Recently, stress corrosion cracking (SCC) of primary piping of stainless steel has been observed. SCC is considered to initiate and progress at near the welding zone in butt-welded pipes, because of the tensile residual stress introduced by welding. In present work, three-dimensional and axisymmetric thermo-elastic-plastic finite element analyses have been carried out, in order to clarify the effect of geometrical and welding conditions on through-thickness residual stress. In particular, butt-welding joints of SUS316L pipes have been examined. The residual stress was simulated by three-dimensional and axisymmetric models and the results were compared and discussed in detail.
Katsuyama, Jinya; Asano, Wataru*; Onizawa, Kunio; Mochizuki, Masahito*; Toyoda, Masao*
Proceedings of 2007 ASME Pressure Vessels and Piping Division Conference/8th International Conference on Creep and Fatigue at Elevated Temperatures (PVP 2007/CREEP-8) (CD-ROM), 8 Pages, 2007/07
Stress corrosion cracking (SCC) of recirculation pipes of austenite stainless steel has been observed. The SCC initiates and grows near the welding zone because of high tensile residual stress by welding. Therefore, the residual stress analysis due to welds of piping is becoming important. In present work, the through-thickness residual stress distributions near multi-pass butt-welds of Type 316L pipes have been calculated by thermo-elastic-plastic analyses. Then crack growth simulations were performed using calculated residual stress distributions. The effects of geometric and welding conditions on crack growth behavior were also discussed.
Yoshida, Masaru; Asano, Masaharu; Omichi, Hideki; Kamimura, Wataru*; Kumakura, Minoru*; Katakai, Ryoichi*
Macromolecules, 30(9), p.2795 - 2796, 1997/05
Times Cited Count：16 Percentile：58.03(Polymer Science)no abstracts in English
Takano, Katsuyoshi*; Asano, Atsushi*; Maeyoshi, Yuta*; Marui, Hiromi*; Omichi, Masaaki*; Saeki, Akinori*; Seki, Shu*; Sato, Takahiro; Kamiya, Tomihiro; Ishii, Yasuyuki; et al.
no journal, ,
Takano, Katsuyoshi*; Asano, Atsushi*; Maeyoshi, Yuta*; Marui, Hiromi*; Omichi, Masaaki*; Saeki, Akinori*; Seki, Shuhei*; Sato, Takahiro; Ishii, Yasuyuki; Kamiya, Tomihiro; et al.
no journal, ,
Asano, Shiro*; Okuyama, Toshihisa*; Mochida, Tsutomu*; Kikuchi, Atsushi*; Odashima, Wataru*; Ejiri, Mitsuru*; Mizumaki, Shoichi*; Shibama, Yusuke; Masaki, Kei; Sakasai, Akira
no journal, ,
no abstracts in English
SR study on Ce(O
F
)BiS
Higemoto, Wataru; Ito, Takashi; Asano, Takuya*; Higashinaka, Ryuji*; Matsuda, Tatsuma*; Aoki, Yuji*
no journal, ,
Recently, it was discovered that relatively high superconducting transition temperature, T
10K, in layered structural system Ln(OF)BiS and many studies have been carried out to clarify the nature of its superconductivity. In some system, novel behaviors were reported. For example, in Ce(OF)BiS with x=0.5, superconductivity and ferromagnetism observed simultaneously. Meanwhile, in x=0 system, Kondo like behavior in temperature dependence of the specific heat without carrier was found. To clarify these behaviors, we are studying Ce(OF)BiS by using SR technique and found that ferromagnetism is not intrinsic behavior.
Yuasa, Wataru; Iida, Takaharu; Iwasa, Hiroshi*; Oikawa, Shuji*; Takanohashi, Mitsuru*; Mizutani, Munekatsu*; Onishi, Sumitaka; Asano, Takashi
no journal, ,
The more stringent physical protection measures are required for the Plutonium Fuel Development Center (PFDC) in Japan Atomic Energy Agency which has some category I facilities. In order to maintain physical protection measures, it is one of importance functions to keep and improve the guards skill. PFDC has performed two kind of exercise, one is the joint exercise with the response force and the other is the internal exercise. In the internal exercise, intruders and response forces are simulated by employees in order to perform practical exercise. However, this exercise is needed many kind of preparation works and many employees and the number of it is limited. PFDC newly introduced the table top exercise (TTX). The TTX is easy to perform without many preparation works and employees. Furthermore, it is possible to perform the exercise with wide range scenarios. This report shows overview of PFDC table top exercise and advantages and future issues of it.
