Ballistic Strength of Kevlar KM2 Fabric Resisting FSP Projectiles

摘要

A micro-level numerical tool, based on an explicit digital element approach(DEA), is developed to simulate impact and penetration of textiles using projectilesof arbitrary shapes.In this approach, the projectile surface is discretized into surface triangleelements and the fabric is discretized into digital elements. A special algorithm isemployed to search contacts between digital elements of the fabric and surfaceelements of the projectile of arbitrary shape. In each simulation step, forces appliedto projectile surface elements and digital elements are calculated. Then, projectilemotions, such as velocity and acceleration, can be calculated based on the resultantforce applied to projectile surface elements and the fabric deformation can becalculated based upon the force applied to digital elements.In the previous DEA analysis, the projectile was simplified as a rigid bodyparticle. As such, only spherical and cylindrical projectiles could be modeled. Thenew Algorithm proposed in this paper expands the capability of the DEA tosimulate ballistic impact using projectiles with arbitrary shapes.In this paper, the contact search algorithm and the contact force calculationbetween the solid body projectile and the fibrous fabric are explained in detail.Firstly, the surfaces of spherical and RCC projectiles are discretized into trianglemeshes. Ballistic strength V50 derived from the discretized surface mesh arecompared to results derived from the previous approach in order to verify theaccuracy of the method. Then, the new algorithm is applied to simulate the ballisticimpact using FSP the projectile. The numerical results are compared to real scalestandard ballistic tests using FSP.