2007 Fiscal Year Final Research Report Summary
Study on Improvement of Fatigue Strength Reliability in Machine and Structure by Laser Peening Treatment
| Project/Area Number |
18560073
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 | The University of Electro-Communications |
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Principal Investigator |
OCHI Yasuo The University of Electro-Communications, Faculty of Electro-Communications, Professor (70017416)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUMURA Takashi The University of Electro-Communications, Faculty of Electro-Communications, Associate Professor (00251710)
MASAKI Kiyotaka Okinawa National College of Technology, 機械システム工学科, Associate Professor (30323885)
KAKIUCHI Toshifumi The university of Electro-Communications, Graduate School of Electro-Communications, Research Associate (20452039)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Laser peening treatment / Fatigue strength reliability / Fatgiue crack propagation control / Machine and structural materials / Micro computed tomography (μCT) / Crack profile obserbation / Compressive residual stress / Strain hardeing layer |
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| Research Abstract |
It is useful for the reducing of weight, energy, materials and the high efficiency to improve the fatigue strength reliability of machines and structures by giving high functional property. In the present research, the laser peening (LP) treatment is performed on machines and structural materials, and it is the porpose of the research to improve the fatigue strength reliability in the materials and to make clear the mechanism of the improvement The laser treatment of low energy YAG laser without protective coating is wsasused in water The materials used in the research a were austenitic stainless steels for nuclear plant structures, cast aluminum alloy for automobile parts and high strength tool steels.
The main conclusions obtained in the research are as followings
1. In all of the materials used in the research, it is confirmed to improve the fatigue strength by the LP treatment. And it is clear that the improvement effects were induced from compressive residual stress and the strain hardening in the surface layer of materials by the LP treatment.
2. The restrained effects for fatigue crack propagation process were confirmed for the pre-cracked materials by the LP treatment And, the effects were induced from the compressive residual stress and the crack closure effect by plastic deformation near crack tip by the LP treatment.
3.By the micro computed tomographic (μ CT) imaging technology with syncroton radiation equipment, surface fatigue cracks were successfully visualized non-destructively and three-dimensionally.
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[Presentation] 疲労予き裂材へのレーザピーニング効果2007
Author(s)
五十嵐崇亮, 政木清孝, 越智保雄, 松村隆, 佐野雄二
Organizer
日本機械学会M&M2007材料力学カンファレンス
Place of Presentation
東京大学生産技術研究所(東京都)
Year and Date
20071024-20071026
Description
「研究成果報告書概要(和文)」より
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