炭/芳纶混杂正交三向复合材料拉伸性能实验研究

Experimental study on tensile properties of carbon/Kevlar hybrid 3D orthogonal composites

设计制备了Z向纱为芳纶纤维、经纬纱为炭纤维和经纬纱间隔排列芳纶纤维与炭纤维的混杂织造的2种炭/芳纶混杂正交三向织物增强环氧树脂复合材料,采用基于全场位移的数字图像相关(DIC)方法,进行了其材料级拉伸性能试验,通过与炭纤维、芳纶纤维2种非混杂的正交三向复合材料对比,分析了炭/芳纶混杂方式对复合材料拉伸性能的影响。实验结果表明,经纬纱采用炭纤维,Z向纱为芳纶纤维的混杂正交三向复合材料面内拉伸模量和断裂强度最大,断裂伸长率和泊松比较高;接下来的复合材料拉伸模量和强度从高到低依次是非混杂的炭纤维复合材料、经纬纱采用炭纤维和芳纶间隔排列的混杂复合材料和非混杂的芳纶纤维复合材料。因此,按比例合理布置炭纤维和芳纶纤维的混杂正交三向复合材料,可实现强度和韧性的折衷设计。

Two kinds of carbon/Kevlar hybrid 3D orthogonal fabric reinforced epoxy composites that z yarn is Kevlar fiber,warp and weft yarn are carbon fiber and Kevlar fiber and carbon fiber are interval arranged in warp and weft yarn were designed and fabricated in this paper.The tensile properties of four kinds of composite materials were tested and analysed using digital image correlation method（DIC） based on full field displacement,and the effect of carbon/Kevlar hybrid ways on tensile properties of 3D orthogonal composites was investigated through comparing with single carbon fiber and single Kevlar fiber 3D orthogonal composites.The results show that the in-plain tensile modulus and fracture strength of hybrid 3D orthogonal composites made of carbon fiber in warp and weft,Z yarn with Kevlar fiber are the biggest,break elongation and Poisson＇s ratio are higher; the tensile strength and modulus following from high to low are non-hybrid carbon fiber composites,hybrid composites with Kevlar fiber and carbon fiber being interval arranged,non-hybrid Kevlar fiber composites.Hence,the reasonable arrangement of carbon fiber and Kevlar fiber at the proportion for hybrid 3D orthogonal composites can achieve the compromise in design of the strength and toughness.