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本文研究了在热水浸环境中两种环氧树脂基体及其碳纤维复合材料的水扩散特征。研究结果表明,复合材科的扩散系数可用树脂基体的扩散系数来预测。还研究了水对复合材料的层间剪切强度、弯曲强度和断裂能的影响。在水浸下两种复合材料力学性能的降低速度取决于它们的水扩散系数。用扫描电镜观察复合材料断裂表面的结果表明,这些力学性能的变化同纤维-基体界面粘结的湿降解直接有关。层间剪切强度的积累性湿降解动力学表达式可用Halpin 等提出的式子来表示。
In this paper, the water diffusion characteristics of two kinds of epoxy matrixes and carbon fiber composites in hot water immersion environment were studied. The results show that the diffusion coefficient of composite materials can be predicted by the diffusion coefficient of resin matrix. The effect of water on the interlaminar shear strength, flexural strength and fracture energy of the composites was also studied. The rate of decrease of the mechanical properties of the two composites under water immersion depends on their water diffusion coefficient. Scanning electron microscopy observations of the fracture surface of the composites show that these changes in mechanical properties are directly related to wet degradation of the fiber-matrix interface. The cumulative wet degradation kinetic expression of interlaminar shear strength can be expressed by the formula proposed by Halpin et al.