环氧树脂基复合材料加筋板结构吸湿行为研究

环氧树脂基复合材料的性能对湿热环境敏感，掌握该材料所组成结构的吸湿行为对其实际应用具有重要意义。通过以碳纤维环氧树脂基复合材料层合板的non-Fickian吸湿模型为基础，建立环氧树脂基复合材料加筋板结构的non-Fickian吸湿模型，在70℃/85% RH湿热条件下开展加筋板结构的吸湿实验，对所建立模型进行验证，并与已有的加筋板吸湿模型进行对比，通过所建立模型给出了加筋板沿厚度方向的吸湿量分布规律。结果表明:所建立加筋板non-Fickian吸湿模型的计算结果与实验结果吻合良好，在整个吸湿阶段相对误差小于5%，模型的预测精度高于传统Fick模型。所建立的加筋板non-Fickian吸湿模型可用于环氧树脂基复合材料加筋板层合结构吸湿量的准确预测。 

Moisture absorption behavior of epoxy resin matrix composite stiffened panel

The properties of epoxy resin matrix composites are sensitive to hygrothermal environment, and it is of great significance to investigate the moisture absorption behavior of epoxy resin matrix composite structures for its practical application. Based on the non-Fickian moisture absorption model of carbon fiber epoxy resin matrix laminates, the non-Fickian moisture absorption model for the epoxy resin matrix stiffened panel was established, the moisture absorption experiments of stiffened panel were conducted under the condition of 70℃/85% RH, and the established model was verified. The proposed model was compared with the existing moisture absorption model further. Finally, the moisture absorption distribution of the typical stiffened panel along the thickness direction was given through the established model. The results show that the calculated results of the established non-Fickian moisture absorption model of the stiffened panel are in good agreement with the experimental results. The relative error of the moisture absorption through the entire moisture absorption stage is less than 5%, and the predictive accuracy of the model is higher than that of the traditional Fick model. The established non-Fickian moisture absorption model of stiffened panel can be used to accurately predict the absorbed moisture content of epoxy resin matrix composite stiffened panels.