2012 Fiscal Year Final Research Report
Unified understanding of the formation of unique fracture surface region in vacuum environment
| Project/Area Number |
23760081
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Hokkaido University |
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Principal Investigator |
OGUMA Hiroyuki 北海道大学, 大学院・工学研究院, 准教授 (80515122)
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| Project Period (FY) |
2011 – 2012
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| Keywords | 疲労 / 内部破壊 / 疲労き裂進展 / 破面形成機構 |
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| Research Abstract |
To clarify the formation mechanism and the process of forming the granular region, which is a unique phenomenon in the very high cycle fatigue, fatigue tests using specimens with an artificial defect were conducted in vacuum. The fatigue tests were based on the idea that the environment around sub-surface fatigue crack is vacuum-like environment. During the tests, fracture surfaces were intentionallycontacted. Fracture surface observations revealed that repeating contacts of the fracture surfaces and vacuum environment are necessary for the formation of the granular region.A new mechanism for the formation of the granular region was proposed.
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