Abstract
Generally woven cloth laminates have a typical right-angled anisotropy. Their thermal and mechanical properties are also dependent upon temperature at cryogenic atmosphare. Therefore, it is necessary for cryogenic use to understand the anisotropy of FRP. In this report, the thermal contract and bending property of woven cloth laminates have been studied by changing the off-axis angle in order to analyze the anisotropy of FRP for cryogenic use. The angle-ply FRP, made by piling up the woven cloth lamina at a fixed angle, and hybrid FRP have also been investigated so as to reduce the anisotropy of the thermal contraction and bending property.The following results are obtained.(1) The thermal contraction of cross ply FRP has a peak value when the off-axis angle becomes 45°, that is the maximum mismatch angle made by the principal axis and fiber direction of the specimen. Especially AFRP shows a notable anisotropy.(2) The 45° angle ply FRP and hybrid FRP are effective to reduce the anisotropy of thermal contraction and bending property at low temperatures.
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