| Project/Area Number |
11355007
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| Research Category |
Grant-in-Aid for Scientific Research (A).
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
KOMAI Kenjiro Kyoto University, Faculty of Engineering Professor, 工学研究科, 教授 (70025948)
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| Co-Investigator(Kenkyū-buntansha) |
SENDAI Tomoko Mitsubishi Electric Corp., Researcher, 産業システム研究所, 主任研究員(研究職)
TANAKA Kazuto Kyoto University, Faculty of Engineering Research associate, 工学研究科, 助手 (50303855)
MINOSHIMA Kohji Kyoto University, Faculty of Engineering Associated Professor, 工学研究科, 助教授 (50174107)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥26,800,000 (Direct Cost: ¥26,800,000)
Fiscal Year 2000: ¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1999: ¥20,600,000 (Direct Cost: ¥20,600,000)
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| Keywords | Micromaterials / Micromachine / Mechanical properties / Fracture / Fatigue / Electric discharge machining / Non-contact strain measurement / Metal Thin Film / マイクロマシーン |
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| Research Abstract |
In order to develop a reliable micromachine in a service operation, much care must be taken to micro mechanical evaluation, i.e., mechanical properties of μm-sized microelements including fatigue behavior. However, the evaluation method has not been well established yet. In this study, the evaluation system of metallic foil is developed, including in situ specimen machining, chucking and non-contact strain measurement. Using an electric discharge machine (PX-05 : Mitsubishi Co.Ltd.), micro specimens of stainless steel foil were machined and a suitable machining condition was found to minimize the roughness of machined surface : the minimum of the maximum roughness was 1.0μm. The micro specimen for tensile testing was designed to make easily handle and testing, which has the specimen supporting part and the specimen chucking part. To measure the strain of microelements, for which strain gages on the market are too large and strong, a laser speckle strain measurement method was applied, and non-contact strain measurement system for microelements was developed. Integrating these machining system and non-contact strain measurement system, tensile and fatigue tests of micro specimens of stainless steel foil (thickness : 50 μm, width : 1 mm) was successfully conducted, and the influence of anisotropy and machining method on the mechanical and fatigue strength was investigated. The elongation at break and fracture morphology of tensile tests were affected by specimen orientation, but fatigue strength was not.
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