碳纤维复丝拉伸样条断面形貌分析

Analysis of the Cross Section Morphology of Carbon Fiber Multifilament Tensile Samples

利用扫描电子显微镜对碳纤维复丝拉伸样条断面进行分析,断面上同时存在纤维拔出区域、孔洞和正常断裂区,正常断裂区仅占断面面积的60%~80%。实验证明,孔洞的存在对拉伸强度的影响明显,通过在浸胶后的晾胶过程增加脱泡和恒张力控制,可以有效提高正常断裂区的比例,从而提高拉伸强度。纤维拔出现象与纤维丝束中单丝间的均一性有关。

Scanning electron microscope(SEM)is used to analyze the tensile sample section of carbon fiber multifilament.There are fiber pull out area,hole and normal fracture area on the section,and normal fracture area only accounts for 60%~80%of the section area.The test shows that the existence of holes has a significant impact on the tensile strength.By increasing the defoaming and constant tension control in the process of drying glue after soaking,the proportion of normal fracture zone can be effectively increased,thus improving the tensile strength.The phenomenon of fiber's pulling out is related to the homogeneity of single filaments in fiber bundles.