| Project/Area Number |
24656091
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Osaka City University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
HASHIMOTO Satoshi 大阪市立大学, 大学院工学研究科, 名誉教授 (50127122)
VINOGRADOV・A Y 大阪市立大学, 工学(系)研究科(研究院), 准教授 (10283102)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 疲労 / 走査型電子顕微鏡 / 転位 / EBSD / 格子回転 / 電子顕微鏡 / 微視的構造 / EBDS / ECCI / 微視的組織 / 破壊解析 |
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| Outline of Final Research Achievements |
Because cyclic deformation is localized around a tip of fatigue crack, self-organized dislocation structure and lattice distortion are produced below a fracture surface, as signatures of fatigue process. In the present study, we investigates the dislocation structure and the lattice rotation with the ECCI and EBSD techniques. In the experiments employing copper single crystals, we observed the concentric distributions of the vein and the cell dislocations structures, which were affected by the distance from fracture surface, the stress intensity factor range and the crystallographic orientation. In polycrystalline copper, the EBSD analyses revealed that the local lattice rotation near the fracture surface depended on the stress intensity factor range. These results suggest a possibility that a fracture process can be estimated by the microstructural observation near the fracture surface.
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