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Shobu, Takahisa; Akita, Koichi; Shiro, Ayumi; Fujishiro, Tomoyuki*; Kiriyama, Koji*; Kumagai, Masayoshi*; Hisamori, Noriyuki*
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Akita, Koichi; Hayashi, Kengo*; Takeda, Kazuya*; Sano, Yuji*; Oya, Shinichi*
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Relaxation process of peening residual stress under mechanical loading was investigated by neutron stress measurement method. Relaxation of the surface compressive residual stress was started before the stress of the surface layer reached the yield stress, which would be caused by the re-distribution of the residual stress due to the plastic deformation of the center region. Therefore, the understanding of the magnitude of balancing tensile residual stress is important to evaluate the relaxation of the surface compressive residual stress against tensile applied stress.
Kiriyama, Hiromitsu; Mori, Michiaki; Suzuki, Masayuki*; Okada, Hajime; Ochi, Yoshihiro; Tanaka, Momoko; Kosuge, Atsushi; Kando, Masaki; Kondo, Kiminori; Nagashima, Keisuke; et al.
no journal, ,
The core competence of our Kansai Photon Science Institute, Japan Atomic Energy Agency is advanced lasers with high brilliance and high average power in the pulse duration range from femtoseconds to nanoseconds. The some of the progress that has been made in the laser development at the Kansai Photon Science Institute of JAEA.
Suzuki, Masayuki*; Kiriyama, Hiromitsu; Daito, Izuru; Okada, Hajime; Ochi, Yoshihiro; Sato, Masatoshi*; Yoshii, Takehiro*; Tamaoki, Yoshinori*; Maeda, Junya*; Matsuoka, Shinichi*; et al.
no journal, ,
no abstracts in English
Nishimura, Akihiko; Yonemoto, Yukihiro; Shimada, Yukihiro
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Femtosecond laser pulses ablated a thin layer on the stainless steel surface where tensile stress had been mechanically induced. Thermal damage was strongly restricted by femtosecond laser pulses. The surface condition after laser ablation turned to be compressive gradually, which indicated a tolerance for Stress Corrosion Cracking. The laser processing application successfully produced two research directions for maintenance of nuclear power plants. One research direction was the fabrication of fiber Bragg grating. The other research direction was the development of prototype new probing system for heat exchanger by laser micro welding. It is the prototype probing system. Up to now, we have been working on both research directions in the new organization in Tsuruga since November 2009.