混杂比对碳/芳纶纤维混杂纬编双轴向多层衬纱织物增强复合材料力学性能的影响  

Effect of hybrid ratio on mechanical properties of carbon/aramid hybrid fiber multi-layered biaxial weft knitted fabric reinforced composites

作　　者：齐业雄[1,2] 姜亚明[1,2] 李嘉禄[1,2] QI Ye-xiong;JIANG Ya-ming;LI Jia-lu(School of Textile Science and Engineering,Tianjin Polytechnic University,Tianjin 300387,China;Key Laboratory of Advanced Textile Composites(Ministry of Education),Tianjin Polytechnic University,Tianjin 300387,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]天津工业大学先进纺织复合材料教育部重点实验室,天津300387

出　　处：《材料工程》2020年第2期71-78,共8页Journal of Materials Engineering

基　　金：天津市自然科学基金项目(18JCQNJC73300,18JCZDJC10020)

摘　　要：利用层内混杂的方式制备碳/芳纶纤维混杂纬编双轴向多层衬纱织物,通过对材料进行拉伸、三点弯曲等实验研究该织物增强复合材料的力学性能及混杂比对其力学性能的影响。结果表明,按照一定的混杂比加入芳纶纤维后复合材料的拉伸性能提高,表现出积极的混杂效应。由于延伸性好的芳纶纤维的加入,使复合材料的拉伸断裂伸长率明显提高,材料破坏模式出现了完全脆性断裂模式(C12材料破坏形式)和“扫帚”形纤维断裂模式(C8A4,C6A6材料破坏形式)。此外,按照一定的混杂比加入芳纶纤维也有效改善了碳纤维增强复合材料的破坏韧性,碳/芳纶纤维混杂MBWK织物增强复合材料的弯曲强度和弯曲模量随混杂比的提高而呈下降趋势,当复合材料中芳纶含量从42%(体积分数,下同)(C6A6)到59.2%(C4A8)的变化过程中,弯曲强度和弯曲模量的降低率较高。0°试样在混杂比为59.2%(C4A8)时,弯曲挠度最大,达到7.49 mm,远高于纯芳纶纤维或纯碳纤维增强的复合材料。所有90°混杂复合材料试样的弯曲挠度均高于纯芳纶纤维或纯碳纤维增强的复合材料,表现出积极的混杂效应。Carbon/aramid fiber hybrid multi-layered biaxial weft knitted fabric was prepared in term of intraply hybridization.The mechanical properties and effect of hybrid ratio on mechanical properties were studied.Through uniaxial tension and three-point bending experiments,the tensile and bending properties and effect of hybrid ratio on mechanical properties were obtained.The results show that the tensile properties of composites are improved by adding aramid fibers according to a certain hybrid ratio,which shows a positive hybrid effect.Due to the addition of aramid fibers with good elongation,the tensile fracture elongation of the composites obviously increases,and the failure modes of the composites appear complete brittle fracture mode(C12 material failure mode)and“broom”fiber fracture mode(C8A4,C6A6 material failure mode).Besides,the fracture toughness of carbon fiber reinforced composites is effectively improved by adding aramid fibers at a certain hybrid ratio.The flexural strength and modulus of carbon/aramid hybrid MBWK fabric reinforced composites decrease with the increasing of hybrid ratio.With aramid content changing from 42%(volume fraction,the same below)(C6A6)to 59.2%(C4A8),the decreasing ratio of the bending strength and bending modulus are high.The bending deflection of 0°samples with a hybrid ratio of 59.2%(C4A8)is the highest,the value is 7.49 mm,which is much higher than that of pure aramid fiber or carbon fiber reinforced composites.The bending deflection of all 90°samples is higher than that of pure aramid fiber or pure carbon fiber reinforced composites,which shows the positive hybrid effects.

关 键 词：混杂复合材料 碳纤维 芳纶纤维 混杂比 拉伸性能 弯曲性能 

分 类 号：TB332[一般工业技术—材料科学与工程]