| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Carbon fiber reinforced plastic (CFRP) is widely used for many structures because of its high strength and rigidity characteristics. However, impact damage such as in-flight lightning strike decreases the strength of the material. In the case of metallic materials, there is only a low possibility of serious damage resulting from lightning strike, but impact damage accumulation may occur in CFRP, and damage minimization measures are important. We have investigated possibility to measure the impact force during lightning by using optical fiber sensor. As the results, a gap voltage of several hundred volts results in lightning damage, and a crater forms along the current flow direction. We found that the lightning trace depended on the direction of the carbon fibers and not on the direction of current flow. The optical fiber sensor was able to measure the pressure from the lightning strike when the applied voltage was several hundred volts.
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