| Project/Area Number |
14350049
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Tohoku University |
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Principal Investigator |
SOYAMA Hitoshi Tohoku University, Graduate School of Engineering, Professor, 大学院・工学研究科, 教授 (90211995)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Yutaka Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (10260415)
YAMANAKA Masashi Tohoku University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (20292229)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥14,600,000 (Direct Cost: ¥14,600,000)
Fiscal Year 2004: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2003: ¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 2002: ¥7,400,000 (Direct Cost: ¥7,400,000)
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| Keywords | Peening / Cavitation / Fatigue strength / Residual stress / Water jet / Impact / Plastic deformation / Standoff distance / ステンレス鋼 / 加工速度 / 噴流 / 塑性変形ピット / チタン合金 / 圧縮残留応力 / シミュレーション / 塑性ひずみ / 再結晶 / アルミニウム / 加工硬化 |
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| Research Abstract |
The main results obtained are as follows :
1.The cavitating jet in air was observed and it was revealed that the periodical cavitation-cloud-shedding around the high-speed water jet and the fluctuation of the low-speed water jet were interfered each other.
2.Pure aluminum specimen was treated by the cavitation shotless peening. It was revealed by means of recrystallization-etch technique that the plastic deformation was induced by the cavitation shotless peening.
3.The cavitation impacts energy was measured by the cavitation impact counter. It was revealed that the cavitation impacts induced by the cavitating jet in air were more intense compared with that of the cavitating jet in water.
4.The stress distribution of cavitation impacts was estimated by the shape of plastic deformation pits. In order to apply the cavitation shotless peening to tribology area, the introduction of compressive residual stress into titanium alloy was revealed.
5.In order to establish monitoring method of cavitation shotless peening, the relation between the impact energy measured by the PVDF sensor and the vibration measured by the laser doppler velocity meter were revealed.
6.The proposed shotless peening and the conventional shot peening were compared. The difference of the peening methods in view point of introduction of compressive residual and the improvement of fatigue strength was revealed.
7.In order to control the cavitation impact intensity, the plastic deformation pits produced by cavitation shotless peening were measured precisely. The pressure distribution of cavitation impact was successfully controlled by the injection pressure of the low-speed water jet and the standoff distance.
8.The injection pressure of the low-speed water jet and the standoff distance, which were the main parameters of the cavitation shotless peening, were optimized.
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