纺织学报 ›› 2018, Vol. 39 ›› Issue (02): 49-54.doi: 10.13475/j.fzxb.20171000206

• 纺织工程 • 上一篇    下一篇

碳/芳纶混编三维编织复合材料拉伸性能

  

  • 收稿日期:2017-10-09 修回日期:2017-11-13 出版日期:2018-02-15 发布日期:2018-02-11

Tesile properties of carbon-aramid hybrid 3-d braided composites

  • Received:2017-10-09 Revised:2017-11-13 Online:2018-02-15 Published:2018-02-11

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。

关键词: 三维编织, 混编复合材料, 拉伸性能, 泊松比

Abstract:

In order to analyze the tensile property and failure mechanism of 3-D braided composites, three-dimensional five-directional (3D5d) 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 ratios 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 -3D 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 seriousily losed the tensile strength and modulus of the composites. For the same hybrid braided structure, the tensile strength and modulus of 3D5d were higher than those of 3D6d. The ultimate tensile strain of 3D5d and 3D6d show few differences. The high strain regions of hybrid braided composites (axial yarns are aramid and carbon fibers, respectively) are appwoximately lattice and wave line distribution, respectively. The high strain regions of 3D5d and 3D6d are distributed uniformly and transversely, respectively.

Key words: 3-D braiding, hybrid braided composite, tensile property, Poisson's ratio

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