| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
As a fundamental study of fatigue durability investigation and its diagnostic technique under high-strain rate and high-cycle loading, we have performed gigacycle fatigue test using an ultrasonic fatigue testing machine to investigate the nondestructive detection technique of fatigue crack initiation and propagation. Fatigue strength of solution-annealed and cold-worked austenitic stainless steel SU316L up to 10＾9 cycles under room temperature and 250 degC were evaluated. Furthermore, the mechanisms of abrupt temperature rise observed in the fatigue test were experimentally and analytically investigated.
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