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Futakawa, Masatoshi; Naoe, Takashi*; Kogawa, Hiroyuki; Ishikura, Shuichi*; Date, Hidefumi*
Zairyo, 53(3), p.283 - 288, 2004/03
no abstracts in English
Futakawa, Masatoshi; Kogawa, Hiroyuki; Ishikura, Shuichi*; Kudo, Hisaaki*; Soyama, Hitoshi*
Journal de Physique, IV, 110, p.583 - 588, 2003/09
A liquid-mercury target system for the MW-scale target is being developed in the world. The moment the proton beams bombard the target, pressure waves will be generated in the mercury by the thermally shocked heat deposition. Provided that the negative pressure generates through its propagation in the mercury target and causes cavitation in the mercury, there is the possibility for the cavitation bubbles collapse to form pits on the interface between the mercury and the target vessel wall. In order to estimate the cavitation erosion damage, Split Hopkinson Pressure Bar (SHPB) tests impact tests were performed to impose the impact pressure to the interface between mercury and solid metals. In particular, the surface hardening treated samples: Kolsterising, some coatings are investigated. As results, it is confirmed that the pitting damage is suppressed by surface hardening treatments and relative hardness appeared to be a good correlating parameter on impact erosion resistance.
Kikuchi, Kenji; Kogawa, Hiroyuki; Futakawa, Masatoshi; Ishikura, Shuichi*; Kaminaga, Masanori; Hino, Ryutaro
Journal of Nuclear Materials, 318(1-3), p.84 - 91, 2003/05
Times Cited Count：16 Percentile：71.11(Materials Science, Multidisciplinary)In mercury spallation target development pitting is a technical issue, which is appeared on the target vessel in conjunction with the pressure wave. Pitting is found in the off-beam line test by Split Hopkinson Pressure Bar (SHPB) test and then found in the on-beam test of mercury target at WNR of LANSCE. In SHPB tests pressure in mercury was reduced from 80, 40, 20 and 10MPa. And type 316 stainless steel was inspected before and after the impacting test at x450 magnification. Results show that over 20MPa pitting was generated. But at the lowest pressure in mercury, the number of pitting was very limited and substantial damage was small. Substantial damage by pitting is characterized by holes because mass will be removed from the wall. Depression itself may not be a substantial damage as long as it is not accompanied with holes.
Futakawa, Masatoshi; Kogawa, Hiroyuki; Tsai, C.-C.*; Ishikura, Shuichi*; Ikeda, Yujiro
JAERI-Research 2003-005, 70 Pages, 2003/03
JAERI-Research-2003-005.pdf:12.08MB
A liquid-mercury target system for the MW-scale target is being developed in the world. The moment the proton beams bombard the target, stress waves will be imposed on the beam window and pressure waves will be generated in the mercury by the thermally shocked heat deposition. Provided that the negative pressure generates through its propagation in the mercury target and causes cavitation in the mercury, there is the possibility for the cavitation bubbles collapse to form pits on the interface between the mercury and the target vessel wall. In order to estimate the cavitation erosion damage due to pitting, two types of off-line tests were performed: Split Hopkinson Pressure Bar (SHPB), and Magnetic IMpact Testing Machine (MIMTM). The data on the pitting damage at the high cycle impacts up to 10 million were given by the MIMTM. As a result, it is confirmed that the mean depth erosion is predictable using a homologous line in the steady state with mass loss independently of testing machines and the incubation period is very dependent on materials and imposed pressures.
Koyama, Tomofumi*; Futakawa, Masatoshi; Kogawa, Hiroyuki; Ishikura, Shuichi*
Nihon Kikai Gakkai Kanto Shibu Ibaraki Koenkai (2002) Koen Rombunshu, p.5 - 6, 2002/09
no abstracts in English
