Abstract
Effects of the uptake of water on the constant amplitude tension-tension fatigue behavior of a plain-woven CFRP quasi-isotropic laminate in the fiber direction are examined. First, fundamental features in the uptake of water by CFRP specimens are studied. For this purpose, specimens are immersed in hot water at a constant temperature of 71℃, and their weight gain by water uptake is measured over the period of study. Overall, two different kinds of water uptake behavior of specimens are observed. One is roughly Fickian in nature, and the water uptake tends to saturate in 1000 hours at the level of 1.0% weight gain. In the other case, the weight of specimens immersed in hot water exceeds 1.5% weight gain. Detailed observation of the latter specimens reveals that an artificial material like fur has adhered on the surface of those specimens, and the anomalous increase in weight gain might be ascribed to the adhesion of fur. Next, static tension tests are performed at room temperature on the specimens immersed in hot water until saturation and on the specimens that are not exposed to water environment. The specimens immersed in water show slightly higher tensile strength than the specimens with no water uptake. Then, tension-tension fatigue tests are carried out using those wet and dry specimens. It is demonstrated that the fatigue lives of wet specimens are shorter than those of dry specimens.
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