| Project/Area Number |
11355006
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Tohoku University |
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Principal Investigator |
SHOJI Tetsuo Tohoku University, Graduate School of Engineering, Prof., 大学院・工学研究科, 教授 (80091700)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Yasumoto Tohoku University, Graduate School of Engineering, JSPS, Postdoctral fellow, 大学院・工学研究科, 特別研究員
TAMAKAWA Kinji Tohoku University, Graduate School of Engineering, Res. Ass., 大学院・工学研究科, 助手 (30005368)
SATO Motoyuki Tohoku University, Center of Northeast Asian Studies, Prof., 東北アジア研究センター, 教授 (40178778)
SAGA Takeshi Scientia Corporation, R&D group, Researcher, 研究開発グループ, 研究員(研究職)
MINKOV DORIAN 東北大学, 大学院・工学研究科, 助教授 (30291264)
中里 俊晴 株式会社 サイエンティア 研究開発グループ, グループリーダー(研究職)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥29,580,000 (Direct Cost: ¥28,200,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2001: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2000: ¥11,700,000 (Direct Cost: ¥11,700,000)
Fiscal Year 1999: ¥11,900,000 (Direct Cost: ¥11,900,000)
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| Keywords | Nondestructive inspection / Magneto-Optical Inspection / Electromagnetic / Antenna / Surface Crack / 遠隔探傷 |
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| Research Abstract |
We have developed a novel non-contact electromagnetic NDI system that after applying an alternating current to specimen detected indirectly the changes in the magnetic field generated by the changes in the induced signal flow around a crack with micro antenna (dipole antenna, loop antenna). We have obtained the following knowledge as a result of carrying out a series of measurement in order to obtain the indicator of establishing various parameters to improve the detection sensitivity in the method that the induction wire induces high frequency current was attached to an inspection object and then micro antenna scanned around there.
1. To generate the constant existing wave depends on the frequency, the induction wire applied a current and the length of specimen, the frequency reduces this influence exists.
2. In this research it is possible to detect the defect with a depth of 1 mm in the case of rift-off 10 mm and it is promising as a remote inspection method.
3. We can raise the detect
… More
ion sensitivity about 30 % as compared with the time of research start by the combination of the length of 15 mm and diameter of 0.26 mm as a result of examination the optimization of micro dipole antenna length and a diameter.
4. We can raise the detection sensitivity about 2.3 times as compared with the time of research start as a result of examination the loop diameter of a micro loop antenna.
5. It is related with a fatigue crack with a depth of 5.5 mm, the detection sensitivity of a micro loop antenna is about 2.6 times as high as a micro dipole antenna. It is based on the above result ; an antenna sensor combined with an induced wire was developed.
6. It is possible to detect the fatigue crack made into the ferromagnetic material and the paramagnetic material by the sensor combined an induced wire.
7. Although the signal by developed one apparatus sensor showed the asymmetrical distribution to the symmetrical crack, it is thought that a symmetrical signal distribution is obtained by arranging two for an induced line to an antenna, as a result of carrying out the plane detection of the crack circumference for fatigue crack form measurement.
8. A novel non-contact NDI technique that detection of a crack is possible without concerned with the quality of the material was developed. Less
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