经编多轴向织物的压缩性能研究

Compressibility and Spring-back Behavior of Multi-axial Warp Knitting Fabric

真空袋工艺由于采用了柔性的上模具,使得增强织物的厚度很难控制,从而最终的纤维体积含量也就难预测和控制。研究了多轴向织物在真空袋工艺的压缩行为,在干态压缩实验中,讨论了时间,层数,纤维束细度,织物结构以及铺层角度对于最终纤维体积含量的影响。在湿态压缩中讨论了树脂的润湿作用以及润湿后一些织物的反弹行为。对不同纤维体积含量的复合材料横截面进行分析,讨论了不同压力下导致织物压缩的因素。

Resin infusion under flexible tooling（RIFT） is a variant of vacuum-driven resin transfer molding in which the upper solid mould is replaced by the vacuum bag. As one of the tool face is flexible,there is no direct control over the thickness or fiber volume content of the final composite laminate which depend on the compressibility of the reinforcement under pressure.The compaction behavior of multi-axial warp knit reinforcement is investigated.It focus on the compaction time,layer of reinforcement,size of the bundle,reinforcement structure and the lay-up angle in the dry compaction test and the resin＇s lubrication effect on the reinforcement and the spring back behavior of reinforcement after resin pass over.Laminaes compressed to different level of target fiber volume fraction were sectioned through the thickness direction and their optical micrographs were used to analyze the real reason for compaction.