风电叶片用碳/玻层内混杂复合材料湿热老化性能

Hygrothermal Aging Performance of Carbon/Glass Fiber Inner-ply Hybrid Composites for Wind Turbine Blades

为研究风电叶片用层内混杂碳纤维和玻璃纤维织物增强环氧树脂复合材料在湿热环境下的性能变化,采用真空辅助树脂灌注(VARI)成型工艺制备碳/玻层内混杂复合材料层压板,研究了VARI成型层内混杂复合材料在湿热老化后的界面结构与力学性能的变化规律。结果表明,湿热老化后的层内混杂复合材料中的环氧树脂发生部分水解,树脂含量显著降低,出现明显的基体脱粘现象;碳/玻界面处的空隙增大,层内混杂复合材料的界面结合降低;碳/玻混杂比与复合材料中水的扩散系数呈现明显的负相关;碳/玻混杂比提高,老化初始阶段复合材料的0°拉伸强度、0°压缩弹性模量和弯曲弹性模量均有所提高。随着湿热老化时间的增加,碳/玻层内混杂复合材料的部分力学性能在下降到一定程度时会趋于稳定。

In order to study the performance changes of hybrid carbon fiber and glass fiber fabric reinforced epoxy resin composites for wind turbine blades under hygrothermal environment,vacuum-assisted resin infusion(VARI)molding process was used to prepare carbon/glass inner-ply hybrid composite laminates.The changes of interface structure and mechanical properties of VARI formed carbon/glass inner-ply hybrid composites after hygrothermal aging were studied.The results show that the epoxy resin in the inner-ply hybrid composites after hygrothermal aging is partially hydrolyzed,the resin content is significantly reduced,and the matrix debonding phenomenon is obvious;the void at the carbon/glass interface increases and the interfacial bonding of the hybrid composites decreases.There is a significant negative correlation between the carbon/glass hybrid ratio and the diffusion coefficient of water in the composites.With the increase of carbon/glass hybrid ratio,the 0°tensile strength,0°compressive modulus and flexural modulus of the composites are improved during the initial stage of aging.With the increase of hygrothermal aging time,some mechanical properties of the carbon/glass hybrid composites tend to be stable when they decrease to a certain extent.