1735 酸応力環境下における GFRP 織物積層板のき裂進展特性 : 耐食性 FRP の下限界特性

概要

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Objective of this study is to clarify the crack-propagation properties of corrosion resistant GFRP laminates under various acid stress environments, an effect of the constituents on fracture and the threshold properties of the crack propagation. This experiment was performed under constant loading in HCl solution and the crack propagation behavior was depicted on a K_1-da/dt diagram. The fracture surfaces of the specimens were observed by scanning electron microscope. As the acid concentration increased the crack propagation was accelerated, however, the effect of the acid concentration was not so dominant. The crack propagation behavior in the water was largely enhanced in comparison with that in the air and it was nearly as promoted as that in the acid solution. Therefore it was noted that the failure of the C/VE systems was occurred by not fiber corrosion but absorption and swelling derived from the diffusion of the water into the matrix and a changing of the stress shearing on the fibers at crack tip.
2000-07-31