A study on stress corrosion cracking of GFRP using single fiber model specimen (stress-assisted diffusion and degradation mechanism)

摘要

Single fiber fragmentation tests have been conducted to examine the degradation mechanism using a single fiber E-glass/Vinylester 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 the fiber strength and the interfacial shear strength has been investigated as a function of immersion time. As a result, the strength of fiber in stressed specimens was lower than that in unstressed specimens. This result indicates that the stressed polymer have the diffusion of the corrosive solution acceralated. The fiber degradation behavior was not changed regardless of each environmental condition, such as water and acid. It seemed that only the water would diffuse into the resin, and the acid would not. A Fickian diffusion analysis has shown that the moisture concentration around the fiber already reached a saturation limit at the beginning the acid diffusion. So, it was believed that the water diffusion affects on materials, fiber, matrix and interface before the acid corrodes materials. In this study, the effect moisture diffusion on each material was mainly discussed.