Three-dimensional profile reconstruction of a natural SCC colony through electromagnetic NDT methods
| Project/Area Number |
19F19045
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| Research Category |
Grant-in-Aid for JSPS Fellows
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| Allocation Type | Single-year Grants |
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| Section | 外国 |
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| Review Section |
Basic Section 31010:Nuclear engineering-related
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| Research Institution | Tohoku University |
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Principal Investigator |
遊佐 訓孝 東北大学, 工学研究科, 教授 (60466779)
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| Co-Investigator(Kenkyū-buntansha) |
GE JIUHAO 東北大学, 工学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2019-07-24 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2021: ¥100,000 (Direct Cost: ¥100,000)
Fiscal Year 2020: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2019: ¥1,100,000 (Direct Cost: ¥1,100,000)
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| Keywords | SCC colony / inversion problem / rotating eddy currents / complex crack / space mapping algorithm |
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| Outline of Research at the Start |
In this research, we will carry out study about natural stress corrosion crack (SCC) colony inspection and evaluation. Natural SCC colony will be fabricated. A high-resolution probe will be developed to identify dense SCC colony. The interaction and superposition principles of electromagnetic field around SCC colony will be studied through theoretical and experimental methods. An inversion algorithm will be finally proposed to reconstruct three-dimensional profile of SCC colony.
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| Outline of Annual Research Achievements |
1) Obtained the three-dimensional profile of stress corrosion crack colonies through the proposed inversion problem algorithm. We found that heuristic learning algorithms such as genetic algorithm and ant colony algorithm were not effective in depth sizing inversion problem using the signal of eddy current testing. Through simulation method, we confirmed that employing three dimensional magnetic signals did not improve the depth sizing accuracy.
2) Studied the detection of crack colonies using uniform and rotating eddy current testing techniques in high speed. The simulation and experiment results indicate that uniform and rotating eddy current testing were less sensitive to speed than traditional eddy current testing.
3) Compared the performance of uniform and rotating eddy current techniques through probability of detection analysis. Moreover, the mechanism of rotating eddy current was studied further. The results indicated that rotating eddy current testing is not always better than uniform eddy current testing. The orientation of eddy current should be selected.
4) The proposed algorithm for transforming the results of rotating eddy current testing to ones of uniform eddy current testing was tested on ferromagnetic material. The results indicated that the algorithm is also effective. When detecting ferromagnetic material, we can separate the magnetic signals of disturbed eddy current and magnetic flux leakage.
5) Finished the whole work in Japan and submitted finial report to JSPS.
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| Research Progress Status |
令和3年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
令和3年度が最終年度であるため、記入しない。
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Report
(3 results)
Research Products
(6 results)
