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
赵庆志 1阳泽濠 1薛怿 1冯阳阳 1张文强 1彭砚双 1刘勇 1张辉 1俞建勇2
作者信息
- 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;东华大学 民用航空复合材料协同创新中心,上海 201620
- 2. 东华大学 纺织科创中心,上海 201620
- 折叠
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(GⅠ C)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4g/m2的PA66V的加入将CF/EP复合材料的GⅠ C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％.
Abstract
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 mode Ⅰ (GⅠ C)and mode Ⅱ(GⅡC)of CF/EP composites before and after toughen-ing 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/m2 in-creases 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 inter-laminar 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Key words
composite/interlaminar toughening/carbon fiber/polyamide 66/fiber veil引用本文复制引用
出版年
2025
NETL
NSTL
万方数据