| Project/Area Number |
21760649
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Aerospace engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
NISHIKAWA Masaaki Tohoku University, 大学院・工学研究科, 准教授 (60512085)
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| Project Period (FY) |
2009 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Keywords | 圧子押込み試験 / 表面改質 / 材料メカニクス / 有限要素法 / 逆問題解析 |
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| Research Abstract |
The present study investigated the mechanism of fatigue strength improvement by peening technology used for weight reduction and strength enhancement of metallic materials, such as the materials for aeronautic components, based on finite element modeling. Especially, focusing on the cavitation peening (CP) using locally high impact force generated by the bubble collapsing in a high-speed water-jet, the relationship between the mechanical properties (residual stress, yield stress) evaluated on the surface of the material after CP and its fatigue properties was clarified. Since the grain boundary much affects the plastic properties of polycrystalline metals, the effect of the microscopic factors including grain boundary on the surface mechanical properties after peening were also clarified using crystal-plasticity analyses.
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