微脱黏法在碳纤维/环氧树脂界面性能评价中的应用

利用微脱黏法测定碳纤维/环氧树脂复合材料的界面剪切强度,并分析了造成测试结果分散的影响因素.结果表明:在脱黏过程中,最大脱黏力随碳纤维埋人环氧树脂内长度的增加而线性递增,当埋人长度超过一定值后最大脱黏力趋于稳定:碳纤维与环氧树脂间的接触角对复合材料界面剪切强度有一定影响,接触角越大,界面剪切强度越高；测试结果的分散性与树脂微球的半月板区域、钳口区等因素有关；未经表面处理的碳纤维增强环氧树脂复合材料的界面剪切强度仪为39.4 MPa,低于处理后的复合材料(60.6 MPa).

Application of microdebond test to evaluation of interfacial properties of carbon fiber/epoxy resin composites

The authors determined the interfacial shear strength(IFSS) of carbon fiber reinforced epoxy resin composites with microbond test and analyzed the influential factors that caused the divergence in IFSS values.The results show that the maximum debonding force increases linearly with the embedment length of the carbon fiber in epoxy resin during the debonding course;the maximum debonding force tend to stabilization when the embedment length exceeds a certain value.The contact angle between the carbon fiber and epoxy resin exerts an influence on the IFSS of the composites;the larger the contact angle,the higher the IFSS.The divergence of the IFSS values is also relevant to meniscus region of the resin microsphere and vise region.The IFSS of the untreated carbon fiber reinforced composites is just 39.6 MPa,lower than that of the composites with the surface treated carbon fiber(60.6 MPa).