| Project/Area Number |
21J12176
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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 | 国内 |
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| Review Section |
Basic Section 18010:Mechanics of materials and materials-related
|
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| Research Institution | Kyushu University |
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Principal Investigator |
TUBEI Valary 九州大学, 工学府, 特別研究員(DC2)
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| Project Period (FY) |
2021-04-28 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2022: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2021: ¥800,000 (Direct Cost: ¥800,000)
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| Keywords | Fatigue / Short crack / Crack closure / 3D observation / X-ray tomography / Simulation / 3D/4D observation |
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| Outline of Research at the Start |
This research aims to investigate short fatigue crack phenomenon in totality, thereby find ways to reduce crack growth rate by understanding how to enhance crack closure. Analysis of local 3D short crack interaction with the microstructure together with the closed crack segments will be done using X-ray tomography. Based on the acquired real 3D crack morphology, develop an image-based CPFEM model to simulate the 3D closure behavior in relation to the underlying microstructure. From the simulation, know how to optimize microstructure to realize materials that are difficult to fracture.
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| Outline of Annual Research Achievements |
Titanium alloys are used in critical applications such as the landing gear of aircrafts which are subjected to severe loading and hence demand excellent fatigue properties. Therefore, the understanding of fatigue damage which accounts for up to 90% of failures in structures is critical. This study aims to characterize the 3D short fatigue crack opening and closing behavior and its influence on crack growth rate. Currently, simulation of crack closing and opening behavior based on the actual 3D crack shape is being conducted. From the simulation, know how crack closure is generated in relation to the microstructure. From this understanding, it is possible to design the microstructure of titanium to develop materials which are difficult to fracture, hence guaranteeing safety.
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| Research Progress Status |
令和4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4年度が最終年度であるため、記入しない。
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