Preparation And Ballistic Performance Of Kevlar Combinational 3D Woven Fabrics

Because of the instability of the regional situation, the frequent occurrence of terrorist attacks, and which promote the development needs of the body armor. Recently, The research on high performance fiber reinforced 3D structure woven fabric composites in the field of impact resistance is becoming more and more popular. The study found the classic three-dimensional structures with different performance characteristics, and the single 3D structure of the composite materials can not meet the performance requirements of the composite materials, a variety of changes, more complex three-dimensional composite structure has a better overall performance. This paper studies the three-dimensional composite structure Kevlar woven fabric, and explores the preparation of a three-dimensional composite structure and impact properties of woven fabrics, the purpose is to study the design of a more gentle, more powerful ballistic body armor.In this paper we use Kevlar fiber and high-strength polyethylene fiber materials, designed and completed orthogonal and quasi-orthogonal, orthogonal, and angle interlock than the number of three-dimensional structure of a group of five classic woven and three groups of five different structural units, quasi-orthogonal and angle interlock dimensional composite structure woven fabrics in the revamped ordinary loom; Test analysis of the thickness of the molding machine fabric weight per square meter and interweave resistance, while referring to "police body armor(GA141-2010)" six degrees of protection requirements, the use of ballistic penetration testing, combined with the thickness of the fabric, weight and resistance from fiber interwoven material selection, classical three-dimensional structures, structural combination and vertical yarn stitching mode-depth analysis of three-dimensional composite structure woven fabric ballistic penetration damage morphology and ballistic characteristics, and explore the three-dimensional composite structure woven fabric bulletproof mechanism and propose the optimization design of three-dimensional compositions woven structure.This paper mainly obtains the following conclusions:(1) Compare Kevlar and UHMWPE fiber materials, the impact resistance of UHMWP classic three-dimensional structure of the fabric is better than Kevlar three-dimensional fabric, and the impact resistance of Kevlar fabric three-dimensional combination is superior.(2) In the classic five through three-dimensional woven structure, the impact resistance of orthogonal structure woven fabrics is optimal, followed by quasi-orthogonal structure woven fabric, and angle interlock structure is worst.(3) The impact resistance of Kevlar composite structure of three-dimensional structure of the number of units and the fabric there is no linear relationship, Combination of orthogonal and quasi-orthogonal structure showed the best impact resistance and impact resistance of a single three-dimensional structure typical have a big improvement,however, combination of orthogonal and angle interlock structure, and combination of quasi-orthogonal and angle interlock structure for improved impact resistance single classic three-dimensional structure is not large.(4) It will change the vertical yarn penetrating the binding mode is plain stitching, little effect on the impact properties of orthogonal structure, and impact resistance quasi-orthogonal structure woven fabric has been greatly improved.(5) The impact of ballistic penetration into three-dimensional structure woven fabric damage morphology: Area near the impact point of the positive is slightly concave, penetration region are circular holes, there was a canine-shaped cross-section neat or coarse fiber in the bullet holes in the surface and inside. But the area near the impact point of the back is slightly bulge, deformation region similar to diamond or round, after the point of impact, the direction of the weft yarn by drawing obviously, there was pulling out of yarn and fiber breakage in the bullet holes.(6) The way of energy absorption of the projectile penetrating three-dimensional composite structure woven fabric: Three-dimensional composite structure woven fabrics absorb the kinetic energy of the projectile mainly for fiber plugging and cut and the yarn stretching and pulling. In the early of projectile impact, stress wave changed by kinetic energy is greater than the fiber fracture work, the positive impact of fabric showed significant plugging damage, the fiber fractured by the elastomeric shear. In the late of projectile impact, stress wave changed by kinetic energy spread to the warp and weft yarn along the contact, at the same time, there are contacts yarn spread to interwoven yarn, and so this forms a surface stress.(7) Optimum design of 3D combined woven structures: the yarn structure of the impact surface of three-dimensional composite structures woven fabric can choose orthorhombic structure to deal with plugging shear effect; The impact of the back of the yarn structure can choose quasi-orthogonal structure in response to stretch Pulling effect; The vertical yarn is connected by the stratification, this way can make the impact surface of the yarn keep straight state, and increase the impact of the back of the yarn closely interwoven, expand the transmission wave front of the stress wave.