Topological analysis of 3D pore distribution in sintered metals-Elucidation of a fatigue failure process of porous materials.
| Project/Area Number |
18K04779
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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 26050:Material processing and microstructure control-related
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| Research Institution | Kyushu University |
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Principal Investigator |
Ozaki Yukiko 九州大学, 工学研究院, 教授 (20637946)
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| Co-Investigator(Kenkyū-buntansha) |
品川 一成 九州大学, 工学研究院, 教授 (30215983)
平山 恭介 京都大学, 工学研究科, 助教 (70717743)
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Project Status |
Completed (Fiscal Year 2022)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Keywords | 焼結金属 / 疲労破壊機構 / 3次元気孔配置 / 位相幾何解析 / パーシステント・ホモロジー / 金属射出成形 / Ti合金 / ３次元気孔配置 / X線CT / 弾性FEM / 有限要素解析 / 位相解析 / パーシステント / 疲労破壊 / 金属疲労機構 / 気孔配置 / パーシステントホモロジー / X線CT測定 / トポロジー / 気孔３D分布 |
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| Outline of Final Research Achievements |
The purpose of this study was to elucidate the role of pores inside the sintered metal in fatigue fracture. First, the residual pore configuration inside the sintered body was visualized using X-ray CT, and the morphological parameters for all pore configurations were quantified using image analysis and topology. At the same time, based on the CT images, the stress distribution in the material under fatigue testing was estimated, and it was found that the edges of the largest pores were the maximum stress concentration points and possible crack initiation sources. Fracture mechanics analysis using the pore morphology parameters showed that the fatigue strength decreases with increasing cross-sectional area of the largest pore, and that the fatigue fracture mechanism of sintered metals can be explained by the same fatigue fracture model as that of metals made from dissolved metals.
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| Academic Significance and Societal Importance of the Research Achievements |
機械部品は，使用環境下で繰返し応力が負荷され、疲労強度の向上は全ての素材における永遠の課題であり、内部欠陥との関係において解析が進んできた。粉末を原料とする焼結金属では、粉末粒子間隙由来の多数の気孔が残存するため、疲労破壊に関わる欠陥の特定が困難であった。そこで、残存気孔配置を放射光の高輝度X線を用いたイメージングにより可視化し、さらに位相幾何学（パーシステント・ホモロジー）の厳密解として、その気孔群の3D配置を定量化することによって、破壊機構を定量的に解析した。この手法は、積層造形等で創造される粉末原料の素材開発において有用な手法となることが期待される。
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Report
(6 results)
Research Products
(12 results)
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[Presentation] Understanding the effect of process parameters on three-dimensional pore configurations and mechanical properties of laser additive manufactured Ti using synchrotron X-ray computed tomography and homology2023
Author(s)
Y. Shigeta, A. Masatoshi, K. Kudo, K. Shinagawa, N.Nomura, K. Kondoh, M.Hoshino, K.Uesugi, Y. Ozaki
Organizer
The International Conference on Sintering 2023, Gifu, Japan
Related Report
Int'l Joint Research / Invited
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