| Budget Amount *help |
¥41,470,000 (Direct Cost: ¥31,900,000、Indirect Cost: ¥9,570,000)
Fiscal Year 2017: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2016: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2015: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Fiscal Year 2014: ¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
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| Outline of Final Research Achievements |
Although the fatigue strength evaluation for ships and offshore structures is performed in consideration of external force induced by sea state, it has been pointed out that the influence of superimposed high-frequency elastic vibration components should be considered. However, the conventional fatigue strength evaluation procedure gives a safe side evaluation results. Furthermore, the fatigue strength is evaluated based on the test results under uniaxial cyclic load condition, although the actual structure is exposed to the biaxial or multiaxial with different phase differences.
In this research, the following two research subjects were conducted. (1) Estimation method of fatigue crack propagation under superimposed stress history condition, (2) Estimation method of the growth behavior of surface crack under in-plane biaxial cyclic stress history with phase difference. We established a method to estimate fatigue crack growth history well under these complicated load conditions.
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