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Saito, Toru; Okubo, Toshikazu*; Izumi, Keisuke*; Okawa, Yoshinao*; Kobayashi, Norihiro*; Yamazaki, Toru; Kawano, Katsumi; Isono, Takaaki
Teion Kogaku, 50(8), p.400 - 408, 2015/08
Aramid fiber-reinforced plastic (AFRP) has been developed as a structural material that has the advantages of light weight and high strength. In this study, tensile tests were carried out to measure the tensile properties of AFRP rod on the market for reinforcement of concrete at room temperature, 77 K and 4.2 K. Especially at cryogenic temperatures, it is difficult to perform a tensile test of the bar because the specimen slips through the jig grip. To prevent the rod from slipping, tensile tests were carried out with some filling conditions. The applicable and appropriate tensile test conditions were established by modifying the jig grip, treating the surface of the rod and using cryogenic epoxy infill to grip the rod. They were more than 1100 MPa. Additionally, the AFRP rod included a temperature dependence in which the Young's modulus increased as the test temperature decreased. It was confirmed that the Young's modulus increased because aramid fiber was more dominant than epoxy.
Okamura, Hiroki*; Tsuchida, Takashi*; Okada, Masao*; Yamagata, Ryohei; Seito, Hajime; Haruyama, Yasuyuki; Kaneko, Hirohisa
2011 Nen (Dai-29-Kai) Denki Setsubi Gakkai Zenkoku Taikai Koen Rombunshu, p.367 - 368, 2011/09
no abstracts in English
Tsuchida, Takashi*; Yamagata, Ryohei; Seito, Hajime; Haruyama, Yasuyuki; Kaneko, Hirohisa; Kashimura, Shinji*
JAEA-Review 2010-065, JAEA Takasaki Annual Report 2009, P. 22, 2011/01
There are a lot of restrictions of electric installations in a high radiation environment. For example longevity of electric devices would be shortened remarkably in a high radiation environment. It becomes impossible also for lighting equipments to keep an original function under a high radiological environment due to deterioration of insulation resistance of ballasts and luminous flux decrease of lamps, etc. The authors developed radiation-resistant lighting. This research aims to verify those functionality and safety under 
-ray irradiation conditions.
Kamikawa, Masaaki*; Izumi, Keisuke*; Takemoto, Jumpei*; Kawasaki, Masaji*; Oka, Kiyoshi; Yamagata, Ryohei
no journal, ,
no abstracts in English
Izumi, Keisuke*; Iguchi, Masayuki*; Kawasaki, Masaji*; Okawa, Yoshinao*; Oka, Kiyoshi; Yamagata, Ryohei; Koyanaka, Akihiro*
no journal, ,
At penetration parts in radiation controlled areas, such as walls and floors where cables go through, the high-airtight performance is required in order to control the negative pressure of air-conditioning. Moreover, since the cables get deteriorated by radiation, the easy replacement works are indispensable. However, the materials in general use have neither resistance, nor any sheltering performance against radiation. In this research, we have developed radiation-proof materials, to meet both an airtight and a sheltering performance.
Kamikawa, Masaaki*; Izumi, Keisuke*; Kawasaki, Masaji*; Oka, Kiyoshi; Yamagata, Ryohei
no journal, ,
no abstracts in English
Izumi, Keisuke*; Iguchi, Masayuki*; Iida, Shinji*; Kawasaki, Masaji*; Okawa, Yoshinao*; Oka, Kiyoshi; Yamagata, Ryohei
no journal, ,
no abstracts in English
Nakajima, Yuta*; Kawasaki, Masaji*; Okawa, Yoshinao*; Oka, Kiyoshi
no journal, ,
no abstracts in English
