单束玻纤增强环氧树脂复合材料吸水规律的理论与实验

Water-absorption Theories and Experiments of Single Glass-fiber-bundles Reinforced Epoxy-based Composites

为评估先进复合材料在湿热环境下长期服役性能,根据Fick第二定律和C.Grave研究结果,建立了树脂基复合材料热水老化扩散控制阶段的吸水率-时间-温度三者间的理论模型(1);在56、66、76、96℃热水中,测定了单束玻璃纤维增强环氧树脂基复合材料的吸水率,确定了理论模型中的参数,建立一个可预测吸水率的计算式(2);在实验结果的基础上,对式(1)进行了修正,提出了一个真正意义上的吸水率-时间t-温度三者关系模型(3),并对单束玻璃纤维增强环氧树脂基复合材料的吸水率进行了拟合评估。

In order to evaluate the utmost performance of advanced composites in long-term hygrothermal environment, according to the Fick＇ s second law and the C. Grave＇ s research, the relationship between water absorption content of epoxy-based composites with temperature and time was researched in the diffusion-controlling stage of hot-water-aging, and a theoretical formula （ 1 ） had been built. The water absorption content of single glass-fiber-bundles reinforced epoxy-based composites were measured in hot water aging at 56,66,76, 96℃ ,separately. Then the formula＇s parameters were determined,and water absorption content could be forecasted by the formula （2）. In the base of the experimental results, the formula （ 1 ） was corrected and a new formula （3） was set-up which can reflect the relationship between water absorption content and t＊ with temperature actually. Finally, the water absorption content of single glass-fiber-bundles reinforced epoxy-based composites was simulated contrasting with experimental results.