204 極低温環境下におけるガラス繊維の引張破壊特性(高分子/高分子基複合材料)

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  • 204 Tensile fracture properties of glass fibers in cryogenics environment

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The cause of strength increase in the glass-fiber at cryogenic temperature has not been fully studied so far. In the present study, tensile tests of a single E-glass fiber in air and liquid nitrogen were conducted to reveal the mechanism of strength increasement. From the mirror zone measurement on the fracture surface, the mirror constant's value was determined. It was clarified that the mirror constant's values of the fiber were equal regardless of the heat treatment condition and testing temperature. These experimental results suggest that an increase of the glass-fiber strength in cryogenic environment is attributed to not the molecule network changing but the crack blunting of the fiber.

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