为研究循环湿热环境对CCF300/5405复合材料体系界面性能的影响,首先对该体系循环吸湿—脱湿行为进行研究,其次分析湿热环境下层间剪切强度的变化,最后采用扫描电镜观察纤维/基体界面的微观形貌.研究结果表明：CCF300/5405体系吸湿处理后,纤维与基体间界面遭到水分破坏,产生大量空隙和裂纹,使得水分的扩散速率明显增加,吸湿率增大,且这种破坏不可逆;吸湿之后材料层间剪切强度下降,烘干之后可以恢复到近于自然干态水平;相对于水分对复合材料的不可逆破坏,可逆破坏对层间剪切强度值减小的贡献更大.
To investigate CCF300/5405 composites interfacial properties under the cyclic hygrothermal condition,a series of experiments were conducted.Firstly,the cyclic moisture absorption and desorption behavior of the composites was studied.Secondly,interlaminar shear strength(ILSS)of the composite specimens during absorption-desorption cyclical processes were tested.Thirdly,the morphology of interface between carbon fiber and resin was characterized by scanning electron microscope(SEM).The results showed that the interface between fiber and matrix is damaged by moisture.With a large number of voids and cracks,the water diffusion rate increases significantly,and saturated moisture uptake increases.Besides,the damage is irreversible even after the moisture desorpion.The ILSS of the composites degrade,and it can be restored to the original level after desorption.The reversible destruction has more influence on the decrease of ILSS than the irreversible damage.
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