Effect of Water Environmental on Fatigue Behavior of GRP

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The present paper deals with the effect of water environment on the fatigue behaviors of plastics reinforced with woven cloth of surface treated glassfiber (GRP). The penetration of water into GRP is known as a diffusion process of water molecule. The diffusion is accelerated by internal defects caused by fatigue. The debonding of the interface between fiber and resin matrix observed with the variation of the diffusion coefficient due to progressing fatigue damage, and the variation depends on the angle, θ, between the warp and the load direction. When specimens are subjected to fatigue in water, the diffusion of water is significantly accelerated. The fatigue life decreases, especially for θ=45°. These fatigue behaviors are proved through observations by means of a scanning electron microscope.
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