Influence Of Armour-grade Composite Process On The Ballistic Performance

Due to the advantages of high toughness,light quality,and good impact resistance,the application in the field of bulletproofing is becoming more and more extensive.The impact of its molding technology on composite materials has become the research focus of domestic and foreign experts.This paper uses the composite target board of the aramid fabric shop as the research object.The method of combining experiments and finite elements has carried out detailed research on the influence of material mechanics and anti-elasticity of the target board forming composite process.The main contents of this study are in the following aspects:1.In the study of the influence of forming process on mechanical properties and drawing properties of fabric,the effects of composite processing on mechanical properties and drawing properties of aramid fabric were studied and discussed by using composite processing(coated finishing and high temperature curing).The result shows that the coating organizational process enhances the overall performance of the fabric,and the resin increases the coefficient between the yarn,which ultimately leads to the improvement of the stretch strength,horizontal shear and pumping performance.The maximum tensile load in the warp direction of 62R(14%)is23% higher than that of the fabric;62R(14%)increased the transverse shear value of the fabric by 45%.After high temperature solidification,the integrity of the fabric has been enhanced,which has further improved the stretching strength and drawing performance of the fabric.However,due to the natural cooling of the resin,the crystallization of the resin inside and outside the fabric can cause internal stress inside the material.The concentration of the yarn stress caused the gauze to break the brittleness of the yarn,which reduced the horizontal shear performance.The maximum load value of 62FR(14%)was reduced by 24% compared to 62R(14%).2.In the process of studying the influence of composite technology on the bulletproof performance of aramid fiber target plate,ballistic test was carried out on the aramid fabric target plate,aramid prepreg target plate and aramid lamination target plate.The results show that the bulletproof performance of aramid prepreg target plate is better than that of fabric because the resin restricts the freedom of yarn.The energy absorption mechanism of aramid prepreg target plate is the shear fracture of yarn and the friction between them.The fabric target plate mainly absorbs energy through the stretching of yarn.The bulletproof performance of aramid laminated target plate is slightly lower than that of aramid prepreg target plate.The reason is that after high temperature curing,the wettability of the resin is improved,and the number of adhesive fibers is increased.Besides,The mechanical strength of the resin part is relatively small.When the bullet penetrates into the target plate,the resin matrix will be cohesively destroyed and the fiber can not play a good role,leading to the decline of ballistic performance.3.Based on the actual structure of the target plate,the finite element software is used to analyze it.In this study,fabric target,prepreg target and laminate target of arfiber were modeled using Fiber level(Fiber bundles)and Yarn level(Yarn),respectively.The results show that under the action of bullet penetration,the main yarn and the secondary yarn produce tensile deformation,and its stress wave propagates furthest.Due to the binding effect of resin,the yarn stress wave transfer is limited in the aramid prepreg target plate and aramid laminate target plate.Their stress peak time is shorter,and their fabric transverse deformation ability is the best,followed by aramid prepreg target plate and aramid laminate target plate.