为探究织物组织结构对复合材料蒙皮拉伸及剪切性能的影响,通过设计织造平纹、斜纹、双层和三维浅交弯联4种典型的机织物,并采用真空辅助树脂传递与热压罐工艺制备了碳纤维复合材料蒙皮,对其进行拉伸性能与层间剪切性能测试。结果表明:斜纹结构织物由于内部纤维束近似平直,拉伸过程中碳纤维束的自身性能得到有效地利用,用其制备的斜纹结构碳纤维复合材料蒙皮的经向、纬向拉伸强度与拉伸模量最大;浅交弯联织物的内部纤维束屈曲程度最大,拉伸过程中碳纤维束会产生分解力,丝束自身的强度利用率低,故用其制备的浅交弯联结构碳纤维复合材料蒙皮的经向、纬向拉伸强度与拉伸模量最小。浅交弯联结构碳纤维复合材料蒙皮的层间剪切性能最优异,相较于其他3种碳纤维复合材料蒙皮,其层间剪切强度提升80%以上。
In order to investigate the effects of fabric structure on the tensile and shear properties of composite skins,four typical woven fabrics-plain weave,twill weave,double layer and three-dimensional shallow cross bending-were designed and prepared.The carbon fiber composite skins were prepared by vacuum-assisted resin transfer and autoclave process,and their tensile properties and interlayer shear properties were tested.The results showed that the inner fiber bundles of the twill structure skin material was approximately straight,and the properties of the carbon fiber bundles could be effectively utilized during the stretching process.As a result,the warp and weft tensile strength and tensile modulus of the corresponding composite skin were the largest.The bending degree of the inner fiber bundles of shallow cross-bending composite skin was the highest,the carbon fiber bundles could produce decomposition force during the stretching process,and the strength utilization rate of the fiber bundles themselves was low,so the warp and weft tensile strength and tensile modulus of the shallow cross-bending composite skins prepared with them were the smallest.Compared with the other three kinds of composite skins,the shallow cross-bending structure carbon fiber composite skins had the best interlayer shear performance,and its interlayer shear strength was increased by more than 80%.
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基金资助
国家重点研发计划(2018YFC0810300);江苏省研究生科研与实践创新计划项目(KYCX24＿3523,KYCX24＿3526,KYCX24＿3530)
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