High resolution imaging of stress corrosion cracking by a confocal subharmonic ultrasonic phased array
| Project/Area Number |
21246105
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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 | 一般 |
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| Research Field |
Material processing/treatments
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| Research Institution | Tohoku University |
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Principal Investigator |
YAMANAKA Kazushi 東北大学, 未来科学技術共同研究センター, 教授 (00292227)
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| Co-Investigator(Kenkyū-buntansha) |
OHARA Yoshikazu 東北大学, 大学院・工学研究科, 助教 (90520875)
TSUJI Toshihiro 東北大学, 大学院・工学研究科, 助教 (70374965)
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| Project Period (FY) |
2009 – 2011
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| Project Status |
Completed (Fiscal Year 2011)
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| Budget Amount *help |
¥44,590,000 (Direct Cost: ¥34,300,000、Indirect Cost: ¥10,290,000)
Fiscal Year 2011: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2010: ¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
Fiscal Year 2009: ¥21,580,000 (Direct Cost: ¥16,600,000、Indirect Cost: ¥4,980,000)
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| Keywords | 非破壊評価 / 非線形超音波 / 閉じたき裂 / フェーズドアレイ / 応力腐食割れ / 非線形 / サブハーモニック / き裂 / アレイ |
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| Research Abstract |
To ensure the safety and reliability of structures such as nuclear power plants, it is necessary to detect closed crack by nonlinear ultrasound. Though the novel imaging method, subharmonic phased array for crack evaluation (SPACE)is a practical solution, the lateral resolution was not high enough. In this research, we developed confocal SPACE with a single array transducer which can transmit a large amplitude focused wave and detect scattered wave using a single array sensor. We then succeeded to image an SCC in a heat affected zone (HAZ)of type 304 stainless steel specimen, formed in high temperature pressurized water, and succeeded in visualizing the closed crack tip in subharmonic image with high selectivity, irrespective of strong linear scattering at grain boundary. We also succeeded in 2D simulation of these waves. This result will significantly contribute to improve the safety and reliability of nuclear power plants.
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Report
(4 results)
Research Products
(121 results)
