预制体表面处理对复合材料低速冲击后剩余强度的影响

摘要

A three-dimensional(3D) curved shallow-crossing linking reinforcement was prepared from glass roving of 2400 tex on a 3D weaving machine modeled SGA598.The reinforcement was treated by 30wt％ silane coupling agent aqueous solution.The resin matrix was composed of epoxy resin E51 and polyether amine WHR-H023 in a mass ratio of 3 ∶ 1.The 3D curved shallow-crossing linking woven composite was then made from surface-treated reinforcement and resin matrix by VARI method.Universal Material Testing Machine was used to characterize the strength of 3D composites after impact,and Scanning Electron Microscope (SEM) was used to observe the microstructure of impact pit of 3D composites.The results showed that higher bending strength after impact is shown in the composites,which is composed of glass fiber treated by silane coupling agent and epoxy resin and that composites showed a more smooth plane in the pit after impact.%以2400tex无捻玻纤粗纱为原料,在SGA598型三维织机上制备出一种三维浅交弯联机织复合材料预制体,以30wt％的硅烷偶联剂水溶液作为表面活性剂,对玻璃纤维预制体进行处理;以环氧树脂E51和固化剂聚醚胺WHR-H023质量比3∶1的比例组成树脂体系,通过真空灌注成型方式制备出三维浅交弯联机织复合材料.借助万能材料仪以不同的冲击能量对复合材料进行低速冲击后再测定其冲击后剩余弯曲强度;并通过扫描电子显微镜对冲击形成的凹坑进行观察.结果表明:经过表面处理的预制体制备出的复合材料剩余弯曲强度均大于未处理预制体;且冲击造成的凹坑微观形态更加平整.