Abstract
Plain woven AFRP samples were immsersed in hot water at 80°C and exposed to humid air at 80°C, 80% RH for 300~days. Furthermore, they were tested by a tensile method to investigate time dependence of their degradation. The longer the immersion time, the greater the degradation of tensile strength. But on comparison with samples exposed to hot humid air, those immersed in hot water showed more degradation, although both conditions had the same temperature. Hot water caused the yarn/resin interface to degrade and led to delamination. Warps, which are weakened by absorption, were further damaged by delamination. Damaged warps broke and final fracture occurred at a low level of stress.
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