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研究碳纤维增强环氧复合材料湿热环境下的吸湿行为。通过试验测试复合材料在温度T=71℃,相对湿度RH=85%环境下吸湿性能,获取吸湿曲线。结果表明复合材料吸湿初始阶段吸湿率和t1/2是呈线性增加的关系,吸湿扩散系数D为3.13×10-3mm2/h,吸湿一定时间后吸湿速率逐渐减小,吸湿1008h左右后,达到吸湿平衡,平衡吸湿率Mm为0.86%左右。结合吸湿Fick定律,建立反映此复合材料吸湿行为的吸湿模型,能较准确的预测此复合材料在该湿热环境下任意时刻的吸湿量及预估达到特定吸湿量所需的时间。
The moisture absorption behavior of carbon fiber reinforced epoxy composites in hot and humid environment was studied. The hygroscopicity of the composites was tested by the test under the conditions of temperature T = 71 ℃ and relative humidity RH = 85%. The results show that the moisture absorption rate increases linearly with t1 / 2 in the initial stage of hygroscopicity, and the coefficient of hygroscopic diffusion D is 3.13 × 10-3mm2 / h. After a certain period of hygroscopicity, the hygroscopicity rate decreases gradually. After hygroscopic for about 1008h, Balance, the equilibrium moisture absorption rate Mm is about 0.86%. Combined with Fick’s law of moisture absorption, a moisture absorption model reflecting the moisture absorption behavior of the composite material can accurately predict the moisture absorption amount of the composite material at any time in the hot and humid environment and estimate the time required to reach a specific moisture absorption amount.