| Project/Area Number |
22K14139
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Briffod Fabien 東京大学, 大学院工学系研究科(工学部), 特任研究員 (70836890)
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Project Status |
Completed (Fiscal Year 2023)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | DIC / Dwell-fatigue / Crystal plasticity / Finite Element Method / Titanium alloy / Fatigue / Ti-6Al-4V / crack initiation / dwell-fatigue / macrozone / Acoustic Emission / Dwell fatigue |
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| Outline of Research at the Start |
The outline of this research is the development of an experimentally-validated numerical microstructure-sensitive framework for the prediction of dwell fatigue in Ti-64 alloy. It is expected to provide reliable and practical guidelines to accelerate the development of dwell-resistant Ti-64 alloy.
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| Outline of Final Research Achievements |
The research successfully achieved the elucidation and prediction of cold dwell fatigue behavior in Ti-6Al-4V alloys from a microstructure-sensitive perspective. Through the integration of in-situ non-destructive evaluation methods (OM, AE), microstructural characterizations (SEM, EBSD), and multi-scale simulations based on crystal plasticity theory (CPFEM), a framework for real-time assessment and prediction of dwell-fatigue in Ti-6Al-4V alloy was developed. Specifically, the following tasks were addressed:
1. Statistical characterization of micro-mechanical damage mechanisms under dwell-fatigue.
2. Development of a physically based microstructure-sensitive dwell-fatigue damage model.
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| Academic Significance and Societal Importance of the Research Achievements |
Dwell-fatigue is a critical issue in titanium Ti-6Al-4V alloy and was clarified by means of a high-resolution strain mapping approach and numerical simulations. The developed tools could be used to predict the dwell-fatigue behavior and improve the reliability of Ti alloys under dwell condition.
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