Experimental Analysis And Finite Element Modeling Of Interlacing Resistance Of Woven Plain Weave Yarn

Modern soft body armor used for bulletproof is composed of multiple layers of woven fabric or other forms of fabric,which prevents high-speed bullets by absorbing and dissipating elastic kinetic energy.A widely accepted theory that this process is the interaction of many influencing factors,among which the influence of friction between yarns on the energy absorption of woven fabrics has aroused extensive attention.Increasing the friction between the yarns allows more yarns to contact the impact projectile,which greatly increases the strain and kinetic energy deposited on the fabric target.In addition,friction helps reduce yarn slippage during ballistic impact.Reducing the mobility between yarns in woven fabrics has a positive effect on energy absorption.This article takes the woven plain weave fabric that is widely used in bulletproof materials as the benchmark(Kevlar29 plain weave fabric is mainly used,supplemented by ultra-high molecular weight polyethylene plain weave fabric),and use yarn pull-out test method.By simulating the strain process of fabric yarns when bulletproof vest is impacted as a process of yarns being pulled out,and combining with the process of yarns' flexion and elongation,the variation of interweaving resistance between yarns are analyzed.First,the yarn pull-out test was carried out on fabrics with different parameters such as fabric pretension,fabric specifications(warp width/weft width),fabric density,etc.The test results show that the change between the maximum interweaving resistance and the transverse pre-tension is positively correlated.In the case of constant pre-tension,as the warp width of the fabric increases,the maximum interweaving resistance between yarns decreases.As the weft width of the fabric increases,the maximum resistance to interweaving between yarns increases.The interweaving resistance of yarns increases with the increase of fabric density when other conditions are the same.Secondly,different types of fabrics such as aramid plain weave fabric,ultra-high molecular weight polyethylene plain weave fabric,rib/plain weave composite fabric,leno/plain weave composite fabric,etc.were tested for yarn pull-out.The results show that when the number of yarns pulled out is different,the maximum interweaving resistance is positively correlated with the change of the number of drawn yarns.The interweaving resistance of rib/plain composite fabrics is better than all other fabrics.Thirdly,yarn pull out tests were carried out on fabrics with different structures,such as winding reinforced structure composite fabric,knitted reinforced structure composite fabric,and stitched structure fabric.The results show that the interweaving resistance between yarns of all composite fabrics with varying structures is improved compared with that of plain weave fabrics.The enhancement effect of the 360-degree rotating flat needle structure is particularly prominent.Finally,the whole process of single yarn pull-out of Kevlar29 plain weave fabric was simulated by Hyperworks and ABAQUS general finite element software.The simulation results and the fabric test results show a high degree of agreement.The friction stress distribution and principal strain distribution of a single fiber at peak interweaving resistance are exactly opposite.The former is distributed on both sides of the yarn,and the latter is distributed in the middle of the fiber.The overall friction stress distribution of the fabric is relatively uniform.The results of the numerical analysis of the interweaving resistance between the yarns are helpful to the study of the mobility between the yarns in the woven fabric,and provide a reference for analyzing the absorption and dissipation of elastic kinetic energy of body armor.