| Budget Amount *help |
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Research Abstract |
Since carbon fiber reinforced polymeric composite material (CFRP) is superior to not only the specific stiffness also in-plane thermal stability, it may be suitable to use as mirror. Before applying CFRP to the mirror, several problems should be solved; one of them is long-term reliability of mirror surface accuracy. It is reported that there exist a "print-through" problem for CFRP mirror surface. The long-term assurance of the surface roughness has not been discussed nevertheless the mechanical property of CFRP is inherently time-dependent. There is a possibility that the time-dependent deformation of the material deteriorates the mirror surface accuracy. The deformation induced by physical ageing, dewater and internal stress relaxation of the matrix may change the surface accuracy. A deformation induced by temperature change is another problem. Time and temperature dependence of the surface accuracy is studied for CFRP sandwich mirror.
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