| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2015: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2014: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
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| Outline of Final Research Achievements |
The purpose of this study is to increase the fatigue crack propagation life of steel materials by increasing the elongation of steel materials, and by hard crystal structures during crack propagation, a crack propagate three-dimensionally.
It was clarified that the fatigue crack propagation life was improved by 50% when the elongation was improved. And when a fatigue crack propagates three-dimensional zigzag due to scattered hard crystal structures, the fatigue crack propagation life is 2.3 times as long as when the fatigue crack propagates straight.
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