研究課題/領域番号 |
22K14139
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研究種目 |
若手研究
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配分区分 | 基金 |
審査区分 |
小区分18010:材料力学および機械材料関連
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研究機関 | 東京大学 |
研究代表者 |
ブリフォ ファビャン 東京大学, 大学院工学系研究科(工学部), 特任助教 (70836890)
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研究期間 (年度) |
2022-04-01 – 2024-03-31
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研究課題ステータス |
交付 (2022年度)
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配分額 *注記 |
4,680千円 (直接経費: 3,600千円、間接経費: 1,080千円)
2023年度: 1,950千円 (直接経費: 1,500千円、間接経費: 450千円)
2022年度: 2,730千円 (直接経費: 2,100千円、間接経費: 630千円)
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キーワード | DIC / Fatigue / Ti-6Al-4V / crack initiation / macrozone / Crystal plasticity / Acoustic Emission / Dwell fatigue / Finite Element Method / Titanium alloy |
研究開始時の研究の概要 |
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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研究実績の概要 |
The main objective of this research is to elucidate cold dwell fatigue mechanisms in Ti6Al-4V alloys in comparison with pure fatigue through a combination of in-situ observationsand numerical simulations. The specific progresses are described below: (1)A High-resolution strain mapping method based on the digital image correlation of surface nano-scale pattern produced by gold nanolayered film through vapor-assisted remodeling was developed. (2)An automated framework for identifying slip system and assessing strain localization of slip bands termed ASSISL (automated Slip System Identification and Strain Localization analysis of slip bands) was developed. (3)The framework was applied to quantifying the differences in strain partitioning between pure and dwell fatigue.
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現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
As originally planned, we were able to experimentally quantify strain partitioning in Ti-6Al-4V alloy under pure fatigure and dwell fatigue. The developed automated procedure allowed us to save a significant time in the large data produced by HR-DIC.
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今後の研究の推進方策 |
In the future, the microstructures observed experimentally by EBSD and DIC will be directly used as a numerical model using the crystal plasticity finite element method. The microstructures will be subjected to the same loading conditions as in experiments and direct comparison will be made between the experimental and numerical strain fields to clarify the predictive capabilities of the numerical method and identify fatigue criteria to predict fatigue crack initiation.
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