低面密度PA66纤维网纱层间增韧碳纤维/环氧树脂复合材料的性能  

Performance of interlayer toughened carbon fiber/epoxy composites of low areal density PA66 fiber veil

作　　者：赵庆志 阳泽濠 薛怿 冯阳阳 张文强 彭砚双 刘勇[1,2] 张辉 俞建勇[3] ZHAO Qingzhi;YANG Zehao;XUE Yi;FENG Yangyang;ZHANG Wenqiang;PENG Yanshuang;LIU Yong;ZHANG Hui;YU Jianyong(State Key Laboratory for Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China;Center for Civil Aviation Composites,Donghua University,Shanghai 201620,China;Innovation Center for Textile Science and Technology,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学材料科学与工程学院,纤维材料改性国家重点实验室,上海201620 [2]东华大学民用航空复合材料协同创新中心,上海201620 [3]东华大学纺织科创中心,上海201620

出　　处：《复合材料学报》2025年第1期263-271,共9页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划(2022YFB3709202);上海市科学技术委员会(22511102702,20511107300);发改委重大攻关项目(ZX202411130236)。

摘　　要：为改善碳纤维/环氧树脂(CF/EP)复合材料的层间断裂韧性,通过湿法成网技术制备出4种不同面密度的聚酰胺66纤维网纱(PA66V),随后将增韧网纱插入碳纤维单向布层间,借助真空辅助树脂灌注(VARI)工艺固化成型制备得到CF/EP复合材料。文中测试了增韧前后CF/EP复合材料的Ⅰ型层间断裂韧性(GⅠC)和Ⅱ型层间断裂韧性(GⅡC),结合断面SEM图像揭示了PA66V引入后CF/EP复合材料的增韧机制,并研究了网纱的引入对CF/EP复合材料其他力学性能的影响。结果表明,面密度为4 g/m2的PA66V的加入将CF/EP复合材料的GIC和GIIC分别提升了13.6%和139.8%,其增韧机制主要包括PA66纤维的桥接拔出、塑性变形以及引发裂纹偏转等;此时,CF/EP复合材料的层间剪切强度和拉伸强度也分别提高了6.5%和5.2%。In order to improve the interlaminar fracture toughness of carbon fiber/epoxy(CF/EP)composites,four polyamide 66 fiber veils(PA66V)with different areal densities were prepared by wet-laid method,and then the toughened fiber veils were inserted into the carbon fiber unidirectional cloth layer,and the CF/EP composite material was prepared by curing and molding by vacuum assisted resin infusion(VARI)process.In this paper,the interlaminar fracture toughness of modeⅠ(G_(ⅠC))and modeⅡ(G_(ⅡC))of CF/EP composites before and after toughening was tested,and the toughening mechanism of CF/EP composites after the introduction of PA66V was revealed by SEM images of the cross-section,and the effect of the introduction of veils on other mechanical properties of CF/EP composites was studied.The results show that the addition of PA66V with an areal density of 4 g/m~2 increases the GIC and GIIC of CF/EP composites by 13.6%and 139.8%,respectively,and its toughening mechanisms mainly include bridging and pulling,plastic deformation and crack deflection of PA66 fibers.At this time,the interlaminar shear strength and tensile strength of CF/EP composites are also increased by 6.5%and 5.2%,respectively.

关 键 词：复合材料 层间增韧 碳纤维 聚酰胺66 纤维网纱 

分 类 号：TB332[一般工业技术—材料科学与工程]