Study On Penetration Resistance And Finite Element Modeling Of Plain Stitched Fabrics

In order to improve its protective performance,this topic introduces stitching technology and studies the ballistic performance of flexible bulletproof vests from two aspects: first,the types of materials,the experimental results of aramid and ultra high molecular polyethylene,and the prediction of simulation values;2 、 Stitching parameter design,introduction of different stitching specifications,and comparative analysis of its simulation.The main findings are as follows:In different materials,the introduction of suture technology has the same trend in changing the friction between fabrics and yarns.That is,the higher the number of sutures,the greater the extraction force in the experimental results of the pull-out experiment.However,facing the increasing penetration speed of projectiles,the wear level of fabrics is further increased,resulting in the weakening of their anti penetration performance.The main reason for the above problems lies in the elastic and inelastic response characteristics of the target material.The suture effectively reduces the sliding displacement between yarns,thereby increasing the friction between yarns.The mechanism of energy dissipation changes from yarn withdrawal of plain weave fabrics to yarn breakage,effectively reducing the possibility of yarn being pulled out by bullets.However,as the density of stitched yarns increases,the penetration resistance of the fabric does not increase.However,when the stitch density increases to a certain extent,the penetration resistance begins to decline.Because the introduction of stitching technology increases the weight of the fabric,in order to better characterize the energy absorption of the fabric,this topic will introduce the concept of penetration specific energy absorption,that is,energy absorption at unit area density.In the penetration experiment,a panel system with stacked multi-layer fabric stitching and a panel system with single-layer stitched fabric stacking were adopted.From the experimental data,it can be seen that the penetration specific energy absorption effect of the system with stacked and then stitched fabrics is significantly better than that of the panel system with single-layer stitched fabric stacking.During the penetration process of projectiles,the system of stacking and stitching is more coupled,with multiple layers simultaneously participating in the absorption of projectile energy,while the panel system of stacking single-layer stitched fabrics is relatively ineffective.Different stitching specifications do have varying degrees of impact on the anti penetration performance of fabrics.Experimental data on the stitch pitch of sewing threads and the angle of oblique stitching are also different.