Experimental study of yarn friction slip and fabric shear deformation in yarn pull-out test

Abstract

Single yarn pull-out test is a model experiment method to research the mechanical properties of fabric under impact. This study aims to understand the yarn pull-out mechanism and fabric shear deformation behavior of Kevlar 49 plain fabric by using the single yarn pull-out test combined with the digital image correlation method. The load-displacement curve contains typical physical phenomena such as crimp extension, crimp swap, frictional slip of yarn, and fabric deformation behavior. In the static friction stage, the pull-out load increased nonlinearly with the displacement, and the crimp extension of the pulled warp yarn occurred gradually. In the kinetic friction stage, the load decreased undulately until the warp was pulled out. Moreover, the fabric shear deformation sharply increased in the static friction stage, then decreased slowly during the kinetic friction stage. It was found that fabric shear deformation was still apparent after the yarn was completely pulled out.

Enhancing the interyarn friction properties of kevlar and glass fabrics through ZnO nanowire coating

“…28 The level of decrements in the pull out load in this region is usually related to the frictional force at the pulled intersections and also to the distance of the pulled yarn from the top edge of the fabric. 29 As seen from Figures 7 and 8, the level of decrements in the load in ZnO NW coated Kevlar and Glass fabrics were significantly large when compared to that of respective bare fabrics. This qualitatively suggested that the coefficient of kinetic friction of ZnO NW coated fabrics was significantly higher than that of respective bare fabrics.…”

Effect of shed geometry on starting mark of woven fabric

“…The pull-out forces increased with increasing fabric pre-tensions and decreased with increasing pullout speeds [21]. The load-displacement curve contains typical physical phenomena like crimp extension, crimp interchange and fabric deformation behavior [22]. The determined crimp of the straight yarn affected by processinherent tensile forces is 0.1% at its maximum [23].…”

Anti-Ballistic Properties of Aramid Fabrics and Composites: A Review

“…1, a schematic diagram of shear deformation of flexible fabric, the yarn pull-out test is the most extensive method to evaluate the adhesive slip and friction properties of fabric yarns. [29][30][31][32] There are many ways to test for anti-ballistic performance including tensile tests, compression tests, and shearing tests. These tests can be carried out on an Instron universal testing machine (model 3382).…”

“…For pre-stretching aramid fibers with more energy absorption, the strength or fracture strength can be improved to prevent premature failure. In the yarn pull-out test of Kevlar, 29 after the yarn is completely drawn out, the fabric shear deformation is still obvious. 29 The obtained load-displacement curve contains typical physical phenomena, such as crimp extension, crimp exchange, yarn friction slip, and fabric deformation, all of which are the behaviors of aramid fiber that consume energy and transmit stress.…”