碳/芳纶混编三维编织复合材料拉伸性能  

Tensile properties of carbon-aramid hybrid 3-D braided composites

作　　者：孙颖 刘俊岭[1,2] 郑园园 陈利 李嘉禄[1,2] 

机构地区：[1]天津工业大学纺织学院,天津300387 [2]天津工业大学先进纺织复合材料重点实验室,天津300387

出　　处：《纺织学报》2018年第2期49-54,共6页Journal of Textile Research

基　　金：国家自然科学基金项目(11102133);质检公益性行业科研专项(201210260)

摘　　要：为分析三维编织复合材料拉伸性能和失效机制,分别以碳纤维和芳纶纤维为轴纱和编织纱织造了三维五向、三维六向碳/芳纶混编复合材料。采用数字图像相关法采集试样在单轴拉伸过程中表面全场应变信息得到的泊松比。结果表明:三维编织复合材料泊松比受编织结构的影响较大,同种编织结构下,碳纤维为轴纱的复合材料基本保持了碳纤维三维编织复合材料的拉伸强度和模量,同时提高了断裂伸长率;芳纶纤维为轴纱的复合材料则显著提高了断裂伸长率,但拉伸强度和模量损失较为明显;同种混编方式下,三维五向编织复合材料的拉伸强度和拉伸模量较三维六向高,断裂伸长率无明显差异。编织纱分别为碳纤维和芳纶纤维的三维编织复合材料高应变区分别类似点阵分布和波浪线分布,三维五向和三维六向编织复合材料高应变区分别呈均匀分散分布和横向分布。In order to analyze the tensile property and failure mechanism of 3-D braided composites, three-dimensional five-directional（3DSd） and three-dimensional six-directional （3D6d） hybrid braided composites with carbon fibers and aramid fibers as axial and braiding yarns were designed and manufactured. A digital image correlation （DIC） technique was used to record the surface full-field strain distribution of samples during tensile loading. At the same time, the Poisson＇s ratio was also obtained by DIC. The test results show that Poisson＇s ratio is mainly influenced by braided architecture. For the same braided architecture, the carbon-aramid hybrid 3-D braided composites with carbon fiber as axial yarn maintain the tensile strength and modulus of carbon 3-D braided composites, while the ultimate tensile strain is higher than that of carbon 3-D braided composites： The carbon-aramid hybrid 3-D braided composites with aramid fiber as axial yarn significantly improve the ultimate tensile strain of the composites, but seriously lose the tensile strength and modulus of the composites. For the same hybrid braided structure, the tensile strength and modulus of 3DSd is higher than those of 3D6d. The ultimate tensile strain of 3DSd and 3D6d show few differences. The high strain regions of hybrid braided composites （axial yarns are aramid and carbon fibers, respectively） are approximately lattice and wave line distribution, respectively. The high strain regions of 3DSd and 3D6d are distributed uniformly and transversely, respectively.

关 键 词：三维编织 混编复合材料 拉伸性能 泊松比 

分 类 号：TB332[一般工业技术—材料科学与工程]