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碳纤维增强环氧树脂基复合材料湿热残余应力的微Raman光谱测试表征

, PP. 22-28

Keywords: 碳纤维/环氧树脂复合材料,湿热残余应力,Raman光谱仪,测试,表征

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Abstract:

采用微Raman光谱仪对碳纤维增强环氧树脂复合材料CF/EP(纤维体积分数为30%)的湿热残余应力进行了研究。实验结果表明:湿热残余应力能够使碳纤维Raman光谱发生频移,根据频移可对纤维所受湿热残余应力进行表征;选择合适的试验点是复合材料湿热残余应力Raman测试成功的关键;在湿热环境下长期吸湿,纤维所受轴向残余应力由吸湿前的热残余压应力转变成吸湿后的湿热残余拉应力;由吸湿后碳纤维所受湿热残余拉应力减去吸湿前热残余压应力获得的吸湿拉应力非常大,平均为2272MPa,接近所用碳纤维的拉伸强度(2800MPa);适当的加工热残余压应力有利于降低吸湿导致的应力。

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