| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
Pipe-in-pipe filled with frozen material can bend smoothly to a large curvature without failure. The authors improved a bending apparatus for experiment to make it follow the bending behavior from elastic to plastic ranges consistently. The measuring method was also improved to observe the large bending curvature by a digital image processing with a high resolution camera. As a result, it was confirmed that the performance of pipe-in-pipe filled with frozen material was drastically improved. The authors proposed numerical models which can evaluate the bending behavior of the pipe-in-pipes, and it becomes possible to explain the effect of filling material on the increase in ductility. The authors are convinced of that the application of pipe-in-pipe to a practical use was enhanced.
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