| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Outline of Final Research Achievements |
The present study developed an improved method to estimate local mechanical properties by indentation tests and investigated the humid gas stress corrosion cracking (HG-SCC) characteristics of aluminum alloys for hydrogen containers and the effect of hydrogen on the fatigue strength of very high cycle regime. The developed indentation method enabled us to predict local stress-strain response in the plastic region in terms of the observation of dents impressed on the specimen surface. However, it was found that this method had size effect attributed to the geometrically necessary dislocation and that the behavior was essential phenomenon. Therefore, other methods were used to investigate the mechanisms of HG-SCC of aluminum alloys and the very high cycle fatigue of bearing steels.
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