228 単繊維モデル試験片を用いたGFRP応力腐食割れに関する研究 : 樹脂中への拡散現象の定量的評価(OS 高分子および高分子複合材料)

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  • 228 Study on Stress Corrosion Cracking of GFRP using Single Fiber Model Specimen : Evaluation of Diffusion Phenomenon into Resin

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Single fiber fragmentation test have been conducted to examine the degradation of inner fiber strength surrounded by the resin using E-glass/Vinylestr model composite. Stressed and unstressed specimens under the environmental attack by water and acid have been prepared. The effect of diffusion phenomenon into the resin on inner fiber strength is investigated as a function of immersion time. As a result, the strength of fiber in stressed resin was lower than that in unstressed resin. This result indicates that stressed polymer have the diffusion phenomenon accelerated. In reference to each environment conditions (water and acid), the fiber degradation behavior was unchanged. It seemed that the water would only diffuse into the resin, and the acid would not. These experimental results were explained analytically based on Fickian diffusion analysis. It is expected that water diffusion affect the mechanism of the fiber degradation in the earlier stage than acid diffusion.

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