2013 Fiscal Year Final Research Report
Establishment of Safety Evaluation Guide Considering Real Usage Environment in Materials Used for High Pressure Hydrogen Gas Containers of Fuel-cell Vehicle
| Project/Area Number |
23760681
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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 |
Structural/Functional materials
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| Research Institution | 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
防衛大学校 |
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Principal Investigator |
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| Research Collaborator |
OGASAWARA Nagahisa 防衛大学校, システム工学群, 教授 (60262408)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 水素 / 衝撃 / 予疲労 / 延性低下 / 組織観察 / アルミニウム合金 / スプリット / ホプキンソン棒法 |
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| Research Abstract |
The effect of pre-fatigue deformation in a high-humidity environment on the tensile impact properties of 7075 aluminum alloys was investigated. Within the author' s set of experiments, the flow stress was unaffected by the pre-fatigue deformation. On the otherhand, it was shown that the ductility of the pre-fatigue specimen was slightly lower than that of the non-fatigue specimen in the impact test. Additionally, the pre-fatigue specimen in a high-humidity environment had a lower ductility than in a low-humidity environment. It is thought that the decrease in ductility occurred due to changes in the microstructure, such as dislocations caused by the presence of hydrogen in the specimen due to pre-fatigue deformation in a high-humidity environment.
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