230 A Study on Stress Corrosion Cracking using Single Fiber Model Specimen : Degradation Properties of GFRP caused by Water Absorption

概要

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Fragmentation tests have been conducted to investigate the degradation mechanism using a single fiber composite. The effects of environmental solution diffusion into the resin on the fiber strength and the interfacial shear strength have been investigated as a function of immersion time. As a result, the fiber strength did not chang in respect to an environmental solution containing water and acid. It was suggested that only water would diffuse into the resin and reach the inner fiber, and that acid would not reach the fiber. A Fickian diffusion analysis showed that the water concentration around the fiber already reached a saturation limit at the beginning of the acid diffusion. In this study, the importance of water diffusion on each material degradation was discussed. It is suggested that only water would diffuse into the resin and reach the inner fiber, and acid would not reach the fiber. Therefore, it is concluded that the water diffusion influences the degradation of materials, fiber, matrix and interface immediately before acid corrodes the fiber and interface.
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