不同结构UHMWPE纤维纬编针织复合材料压缩性能

Compression properties of different structures UHMWPE fiber weft knitted composites

针对高性能超高分子量聚乙烯(UHMWPE)纤维的特性,成功编织出纬平针、罗纹、畦编3种针织物。采用真空辅助树脂传递模塑成型(VARTM)技术,分别制备出6层纬平针、6层罗纹以及6层畦编织物复合材料板。对3种结构复合材料进行压缩试验,并比较分析了比压缩强度-应变曲线、比压缩能量-应变曲线、比压缩能量-应变拟合曲线,分析了压缩过程中的能量吸收情况及材料的破坏形式。结果表明:纬平针结构复合材料的比压缩强度和比压缩能量均最大,其次是罗纹,畦编最小;且3种结构复合材料的压缩破坏过程均不属于脆性破坏;由于材料表现出较好的柔韧性,试样的比压缩能量与压缩应变呈线性相关;相同结构复合材料纵、横向比压缩强度-应变曲线和比压缩能量-应变曲线几乎重合。基体沿增强结构呈分层现象的破坏和树脂的塑性变形是材料的主要破坏形式。

For ultra-high property and ultra-high molecular weight polyethylene fiber＇s （UHMWPE） characteristics, three kinds of knitted fabric including weft plain, rib, cardigan were successfully woven. The six-layers rib weft plain, six-layers and six-layers cardigan knitted composites were made by vacuum assisted resin transfer molding （VARTM） technology. Compression tests of three kinds of composites were conducted. And then we analyzed the specific compressive strength-strain curves, specific compression energy-strain curves, specific compression energy-strain fitting curves, and discussed the energy absorbing condition and damage form during the compression process and. The results show that the specific compression strength and specific compression energy of weft plain knitted composites are the biggest, the second is rib, the cardigan is minimum. And three weft knitted structural composites＇ compression fracture is not brittle fracture. Because of the good flexibility of the composites, samples specific compression energy and compressive strain show linear correlation. For the composites of same structure, the longitudinal and transverse specific compression strength-strain curves, specific compression energy-strain curves are nearly coincident. The damage along reinforced structural matrix and deformation of resin plastic are the main forms of damage to the material.