机织/针织混合铺层对复合材料力学性能的影响

Effect of Woven/Knitted Mixed Layer on Mechanical Properties of Composites

为使纺织复合材料同时具有机织结构复合材料和针织结构复合材料的综合力学性能,通过混合铺层方式制备机织/针织混合结构复合材料。以芳纶机织平纹织物和针织罗纹织物为增强体,以环氧树脂为基体,调整复合材料中增强体的铺层顺序,利用真空辅助成型技术制备四层层压机织/针织混合结构复合材料。通过对复合材料拉伸性能、弯曲性能和冲击性能的测试,分析混合铺层和铺层顺序对芳纶环氧树脂复合材料力学性能的影响。结果表明,混合铺层和铺层顺序对芳纶环氧树脂复合材料的弯曲强度和冲击强度有较大影响,特别是对罗纹结构复合材料纬向弯曲强度和冲击强度的改善。当采用相同铺层方式,罗纹织物为受力面时,机织/针织混合结构复合材料具有较大弯曲强度和冲击强度。

In order to make textile composites have the comprehensive mechanical properties of woven and knitted structural composites,woven/knitted hybrid structural composites were prepared by mixing layers.Four layer woven/knitted hybrid structural composites were prepared by vacuum assisted molding technology through adjusting the laying order of reinforcements with different organizational structures,aramid plain fabric and aramid rib fabric were used as reinforcement materials and epoxy resin was used as matrix.Through the test of tensile,bending and impact properties of the woven/knitted composites,the effects of the mixed layer method and laying sequence on the mechanical properties of the aramid epoxy resin composites were analyzed.The results show that the mixed layer and the laying sequence have great influence on the flexural strength and impact strength of aramid epoxy resin composites,especially the improvement of the latitudinal bending strength and impact strength of rib structure composite.The bending and impact properties of woven/knitted hybrid structure composites are also different when the load bearing surface is different.When the rib fabric is the load-bearing surface,the woven/knitted composite has higher bending strength and impact strength.