The absorption of water in carbon fiber reinforced polymer matrix composites (CFRP) in hydrothermal environment was investigated. Water-sorption experiments were performed in temperature-controlled water bath at 70℃ and different conditions of relative humidity (98% , 91% , 84% R. H. ) at 70℃ according to standards, and the water-sorption curves were obtained. When the relative weight gain of the immersed specimens was reached equilibrium, the others were still increased linearly. The experimental data were analyzed by Fickian diffusion model. The analytical results exhibited a much lower rate of weight gain than experimental data. Diffusivity and solubility were calculated by the combination of experimental results and finite element simulation. Simulations were carried out under different hydrothermal conditions. The simulation results were coincided with the experimental data. The long-term sorption kinetics curves and water distribution within the specimen were obtained.%研究T700/9916碳纤维增强复合材料(CFRP)层合板在湿热环境下的吸湿行为.通过测试CFRP层合板在T=70℃恒温水浴和T=70℃相对湿度为98％,91％和84％的环境下的吸湿性能,获得吸湿曲线.结果表明水浸试样相对质量增量趋于平衡时,其他各组试样的相对质量仍线性增加.使用一维Fick模型对实验结果进行分析,得到材料的理论吸湿数据比实验结果整体偏小.通过实验和有限元模拟相结合的方法计算获得材料的扩散率和溶解度,并对不同条件下的吸湿行为进行模拟,模拟结果与实验结果吻合较好,说明通过模拟能够获得材料的长期吸湿动力学曲线和试样内部的水分分布情况.
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