将碳纤维/环氧树脂复合材料在温度为71℃、相对湿度为85％的环境下吸湿至平衡后研究了它的吸湿行为, 然后分别在室温和71, 93, 116, 132 ℃下进行了弯曲性能、纵横剪切性能、动态力学性能试验, 研究了该复合材料湿热老化后的力学性能。结果表明: 碳纤维/环氧树脂复合材料的吸湿率较低, 其饱和吸湿率仅为0.91%左右; 湿热老化后, 复合材料的弯曲强度保持率在50%以上, 弯曲模量保持率在80%以上, 纵横剪切强度保持率在55%以上, 其玻璃化转变温度为195 ℃, 极限耐热温度可达到132 ℃; 该碳纤维/环氧树脂复合材料具有良好的耐湿热老化能力。

A carbon fiber/epoxy resin composite moisture absorbed to balance at 71 ℃ and relative humidity 85%, and then its moisture absorption behavior was studied, and some tests was carried out, such as bending properties, in-plane shear properties and dynamic mechanical properties testing, the mechanical properties of the composite after hygrothermal aging were studied. The results show that the moisture absorption of the composite was low and was just about 0.91%. After hygrothermal aging, bending strength retention rate of the composite was more than 50%, bending modulus retention rate was more than 80% and in-plane shear retention rate was more than 55%. Glass transition temperature and extreme temperature of the wet composite was 195 ℃ and 132 ℃, respectively. The carbon fiber/epoxy composite has good hygrothermal aging resistance.