| Project/Area Number |
07555351
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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 | 試験 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
MURAKAMI Yukitaka Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (10038010)
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| Co-Investigator(Kenkyū-buntansha) |
TORIYAMA Toshiyuki Ehime University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30227681)
ITOKAZU Masaya University of the Ryukyus, Faculty of Engineering, Research Associate, 工学部, 助手 (40213102)
SAKAE Chu Kyusyu University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (00253477)
MATSUOKA Saburo National Research Institute for Metals, Environmental Performance Division, Dire, 環状性能部, 室長
HAYASHI Yasunori Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (80010940)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1996: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Ultra-Micro Hardness / Multi Thin Layrs / Mechanical Property / Triangular Pyramidal Indentation / Elastic-Plastic Indentation Analysis / Nanoindentation / AFM / STM |
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| Research Abstract |
(1) Software for elastic-plastic FEM analysis of a triangular pyramidal indentation on a multi-thin layrs is developed.
(2) An 'ultra-micro indentation tester' is used to evaluate the Young's modulus of thin coatings. The relationship between the load and the penetration during unloading is used to determined the modulus. Indentation tests at gradually reducing ultimate load are carried out to determine the point at which the substrate material no longer has an influence on the deformation. After this point the unloading is a function of the coating modulus and the geometry of the indenter alone. This method is named the extrapolation method.
(3) In the evaluation of Young's modulus of thin coatings by ultra-micro indentation tester, slow loading/unloading velocity tends to make ones overestimate the modulus due to creep deformation and/or vibrations from the outside of the system.
(4) Nanoindentation measurement for tungsten (001) single crystal is conducted with an AFM ultra-micro hardness tester. For electrolytically-polished tungsten single crystal, sudden penetration occurred during indentation. This behavior does not occur for mechanically-polished surface. The relationship between the load and penetration coincides well with that calculated by elastic FEM analysis before the sudden penetration for electrolytically-polished tungsten single crystal. Therefore, electrolytically-polished tungsten single crystal is probably worth using as a standard material for an AFM ultra-micro hardness test.
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