Single and multiple yarn pull-outs on aramid woven fabric structures

摘要

The aim of this study was to understand the pull-out properties of para-aramid woven fabrics. Para-aramid TwaronnCT714 and CT716 woven fabrics were used to conduct the pull-out tests. Twaron CT714 and CT716 woven fabrics havenlow and high fabric densities, respectively.nA previously developed yarn pull-out fixture was improved to test various fabric sample dimensions. Data generatednfrom the single and multiple yarn pull-out tests using various dimensions of CT714 and CT716 woven fabrics includednfabric pull-out forces, yarn crimp extensions in the fabrics and fabric displacements.nYarn pull-out forces depend on fabric density, fabric sample dimensions and number of pulled ends in the fabric. Resultsnshowed that the multiple yarn pull-out force was higher than that of the single yarn pull-out test. Single and multiple yarnnpull-out forces in Twaron CT716 (tight fabric) were higher than those of Twaron CT714 (loose fabric). Yarn crimpnextension in Twaron CT714 and CT716 fabrics depends on crimp ratios in the warp and weft directions in the fabrics andnon fabric density. High crimp ratio fabrics showed high yarn crimp extension in the fabric compared to that of low crimpnratio fabrics. Wide and long fabric samples also showed high yarn crimp extension compared to that of the narrow andnshort fabric samples. Fabric displacement in Twaron CT714 and CT718 fabrics depends on fabric sample dimensions andnthe number of pulled yarns. Wide and long fabric samples showed high fabric displacement compared to that of thennarrow and short fabric samples. Fabric displacement resulting from the multiple yarn pull-out test was also higher thannthat of the single yarn pull-out test.nFuture research will concentrate on the development of the analytical relations between pull-out and yarn-fabric structuralnparameters which could result in a ballistically better fabric structure for use in soft ballistic applications.