2015 Fiscal Year Final Research Report
Investigation of fatigue damage in nano-scale metals by resonant fatigue testing
Project/Area Number |
26630009
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Research Category |
Grant-in-Aid for Challenging Exploratory Research
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Allocation Type | Multi-year Fund |
Research Field |
Materials/Mechanics of materials
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Research Institution | Kyoto University |
Principal Investigator |
Sumigawa Takashi 京都大学, 工学(系)研究科(研究院), 准教授 (80403989)
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Project Period (FY) |
2014-04-01 – 2016-03-31
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Keywords | ナノ / マイクロ / 疲労 / 金属 |
Outline of Final Research Achievements |
In order to investigate the fatigue behavior of nano-scale metal, a resonant fatigue experiment is developed. In a single crystal gold specimen that possesses a test section with a width of submicron-order, crystallographic slip bands appear on the surface by fatigue. The slip bands are brought about by the activation of a slip system with the maximum resolved shear stress amplitude. The critical value for the formation is evaluated to be more than 150 MPa which is more than 6 times larger than those of persistent slip band (PSB). Cross-sectional FE-SEM observation elucidates that extrusion/intrusion with a width of approximately 60 nm is formed on the surface at the slip bands. Although the morphology of the slip bands is similar to that of PSBs in a bulk counterpart, the width is extremely narrower (bulk: larger than 1 μm).
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Free Research Field |
微小材料強度学,金属結晶学
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