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Journal Articles

Numerical simulation of laser processing

Yamada, Tomonori; Yamashita, Susumu; Sugihara, Kenta; Muramatsu, Toshiharu

Purazuma, Kaku Yugo Gakkai-Shi, 89(7), p.500 - 506, 2013/08

no abstracts in English

Journal Articles

A Round robin program of master curve evaluation using miniature C(T) specimens; First round robin test on uniform specimens of reactor pressure vessel materials

Yamamoto, Masato*; Kimura, Akihiko*; Onizawa, Kunio; Yoshimoto, Kentaro*; Ogawa, Takuya*; Chiba, Atsushi*; Hirano, Takashi*; Sugihara, Takuji*; Sugiyama, Masanari*; Miura, Naoki*; et al.

Proceedings of 2012 ASME Pressure Vessels and Piping Conference (PVP 2012) (DVD-ROM), 7 Pages, 2012/07

Master curve (MC) approach for the fracture toughness evaluation is expected to be a powerful tool to assess the structural integrity of reactor pressure vessels (RPVs). In order to get sufficient number of reliable data for the MC approach from broken halves of surveillance test specimens for RPVs, the use of miniature specimens is necessary. For this purpose, a round robin test program on the miniature compact tension specimens (Mini-CT) of 4 mm thick for the MC approach of a Japanese RPV steel has been launched with the participation of academia, industries and a research institute in Japan. The program aims to verify the reliability of experimental data from Mini-CT, and to pick out further investigation items to be solved. As the first step of this program, four institutes carried out MC testing and evaluation using common test procedure and specimens. Valid reference temperature T$$_{0}$$ was successfully obtained in each institute. However, the T$$_{0}$$ values showed large differences with maximum of 34$$^{circ}$$C. It was indicated on the reason of difference that there is a strong correlation between the T$$_{0}$$ values and loading rate, which was selected by each institute per test standard.

Journal Articles

Numerical simulation of thermohydraulic characteristics of dross ejection process in laser steel cutting

Sugihara, Kenta; Nakamura, Yasuyuki; Ogawa, Takemitsu; Muramatsu, Toshiharu

Proceedings of 20th International Conference on Nuclear Engineering and the ASME 2012 Power Conference (ICONE-20 & POWER 2012) (DVD-ROM), 7 Pages, 2012/07

Numerical simulation code, based on multi-phase thermohydraulics, has been being developed with a goal of a control and prediction for the laser cutting process. A thermohydraulic numerical simulation of the laser steel cutting was carried out to confirm an assist gas and sweep velocity effect to the cutting performance. The performance was evaluated, based on temperature profile and cutting front formation. Simulation results were as follows. If there was no effect of dross ejection by assist gas, a laser light was absorbed into molten steel stagnated in the kerf. Therefore, there was less laser heat input to a solid surface directly. Then, heat transport to the back side of steel plate got delayed. In the case of faster sweep velocity, delay of heat conduction and failure cut were confirmed at behind the cut starting position of the steel plate. Failure cut at the position was observed in our experiments. From these results, it was concluded that the thermohydraulics in the kerf takes important role for not only dross ejection but also promotion of heat input at solid surface.

Oral presentation

Study on applicability of laser cutting technologies for the nuclear facility, 2; Evaluation of the assist gas flow characteristics in laser cutting processes

Ogawa, Takemitsu; Sugihara, Kenta; Nakamura, Yasuyuki; Muramatsu, Toshiharu; Shamoto, Hideyasu*

no journal, , 

no abstracts in English

Oral presentation

Evaluation of transient phenomena in molten pool during laser welding

Yamada, Tomonori; Shobu, Takahisa; Yamashita, Susumu; Ogawa, Takemitsu; Sugihara, Kenta; Nishimura, Akihiko; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Numerical simulation of laser cutting for thick steel plate

Sugihara, Kenta; Ogawa, Takemitsu; Nakamura, Yasuyuki; Muramatsu, Toshiharu

no journal, , 

A thermohydraulic numerical simulation of the laser steel cutting was carried out to confirm an assist gas and sweep velocity effect to the cutting performance. The performance was evaluated, based on temperature profile and cutting front formation. Simulation results were as follows. If there was no effect of dross ejection by assist gas, a laser light was absorbed into molten steel stagnated in the kerf. Therefore, there was less laser heat input to a solid surface directly. Then, heat transport to the back side of steel plate got delayed. In the case of faster sweep velocity, delay of heat conduction and failure cut were confirmed at behind the cut starting position of the steel plate. Failure cut at the position was observed in our experiments. From these results, it was concluded that the thermohydraulics in the kerf takes important role for not only dross ejection but also promotion of heat input at solid surface.

Oral presentation

Study on standardization of laser welding technologies, 8; Evaluation of transient phenomena in molten pool during laser welding

Yamada, Tomonori; Yamashita, Susumu; Sugihara, Kenta; Ogawa, Takemitsu; Shobu, Takahisa; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Study on standardization of laser cutting technologies for reactor plants, 1; Outline of the laser cutting processes and its research program

Muramatsu, Toshiharu; Sugihara, Kenta; Ogawa, Takemitsu; Nakamura, Yasuyuki; Sano, Kazuya

no journal, , 

no abstracts in English

Oral presentation

Study on standardization of laser cutting technologies for reactor plants, 3; Numerical evaluation of dross ejection process in laser cutting

Sugihara, Kenta; Nakamura, Yasuyuki; Ogawa, Takemitsu; Sano, Kazuya; Muramatsu, Toshiharu

no journal, , 

Numerical simulation code, based on multi-phase thermohydraulics, has been being developed with a goal of a control and prediction for the laser cutting process. A thermohydraulic numerical simulation of the laser steel cutting was carried out to confirm an assist gas and sweep velocity effect to the cutting performance. The performance was evaluated, based on temperature profile and cutting front formation. From results of numerical simulation, it was concluded that the thermohydraulics in the kerf takes important role for not only dross ejection but also promotion of heat input at solid surface.

Oral presentation

Real-time observation of laser heated metals with high brightness monochromatic X-ray techniques at present and future prospects

Daido, Hiroyuki; Yamada, Tomonori; Yamashita, Susumu; Sugihara, Kenta; Nishimura, Akihiko; Muramatsu, Toshiharu; Shobu, Takahisa

no journal, , 

no abstracts in English

Oral presentation

In-situ observation of transient hydraulic phenomena in molten pool using intense X-ray beams for standardization of laser welding

Yamada, Tomonori; Yamashita, Susumu; Shobu, Takahisa; Nishimura, Akihiko; Ogawa, Takemitsu; Sugihara, Kenta; Shamoto, Hideyasu*

no journal, , 

no abstracts in English

Oral presentation

Study on standardization of laser cutting technologies for reactor plants, 5; Evaluation of an assist gas flow characteristics in a thin slit plate

Hanari, Toshihide; Sugihara, Kenta; Ogawa, Takemitsu; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Study on standardization of laser cutting technologies for reactor plants, 4; Evaluation of a heat transfer characteristics in the laser cutting processes

Sugihara, Kenta; Ogawa, Takemitsu; Yamada, Tomonori; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Thermal hydraulic evaluation in thick steel laser cutting by numerical and experimental analysis

Sugihara, Kenta; Nakamura, Yasuyuki; Ogawa, Takemitsu; Yamada, Tomonori; Muramatsu, Toshiharu

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

Study on standardization of laser cutting technologies for reactor plants, 7; Influence evaluation of an assist gas inlet flow rate by kerf width difference

Hanari, Toshihide; Sugihara, Kenta; Muramatsu, Toshiharu; Yamashita, Masanori*; Sakakibara, Jun*

no journal, , 

no abstracts in English

Oral presentation

Oral presentation

An Optimization study on neutronic performance of target shape at J-PARC MLF TS2

Harada, Masahide; Sugihara, Kenta*; Teshigawara, Makoto; Takada, Hiroshi; Ikeda, Yujiro

no journal, , 

no abstracts in English

18 (Records 1-18 displayed on this page)
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