| Project/Area Number |
18K04594
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 24020:Marine engineering-related
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| Research Institution | National Institute of Maritime, Port and Aviation Technology |
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Principal Investigator |
Hayashibara Hitoshi 国立研究開発法人海上・港湾・航空技術研究所, 海上技術安全研究所, 主任研究員 (20511588)
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| Project Period (FY) |
2018-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 腐食疲労 / き裂進展 / 船体構造 / 応力腐食 / 応力拡大係数 / 亀裂進展 / すき間腐食 |
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| Outline of Final Research Achievements |
Corrosion Fatigue test with pre-cracked specimens and Immersion test with coupon specimens having semi-elliptical slit were conducted. Accelerating corrosion environment (diluted sulfuric acid) was employed to reduce total testing time. It was observed that deep slit size were shortened due to decrease of dissolution rate at slit tip and competitive phenomenon between general corrosion during the immersion test. Crack growth analysis was also conducted by the developed analytical software that can treat general corrosion and dissolution rate decrease at deep crack tip. Crack growth behavior in the corrosion fatigue test was successfully reproduced in the analysis.
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| Academic Significance and Societal Importance of the Research Achievements |
船体構造の長期的寿命を評価する上で、構造材の腐食疲労挙動をより高精度に把握することが重要である。本研究において、き裂寸法に対する溶解挙動の変化の評価が重要であると示唆する結果が得られると共に、実験結果から全面腐食との競合下にある腐食疲労表面き裂の進展挙動を評価でき、腐食疲労挙動の高精度化に資する知見が得られた。
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