Effect of Sub-Laminate Stacking Sequence on the Transverse Impact and Perforation Behavior of Multi-Layer Soft-Ballistic Armor Pack

Abstract

LS-DYNA computational simulations have been carried out to study the effect of sub-laminate stacking sequences on the transverse impact and perforation behavior of multi-layer soft ballistic armor packs (SBAP). A previously validated finite element model has been used to study the effect of transvers impact as a function of stacking sequence on the minimum perforation velocity and deformation cone. In this study, multiple stacking sequences have been assembled for an 8L-SBAP. Denoting the single layer [0/90] soft-ballistic sub-laminate as [β]SBSL (where β is the material angle of [0/90] SBSL with respect to reference material direction 1 or [0]), the stacking sequences considered are (i) Baseline Layup 1 – [0]8 SBSL, (ii) Layup 2 – [0]4 SBSL [45]4 SBSL, (iii) Layup 3 – [0]2 SBSL [45]2 SBSL 2, (iv) Layup 4 –[0]1 SBSL [45]4, SBSL, (v) Layup 5 – [0â„13â„26â„39â„51â„64â„77â„90]SBSL. Dynamic as the lowest minimum perforation velocity range. At the impact layer, the deformation cone initially has a diamond shape and becomes near circular over time for all stacking sequences. On the other hand, at the rear/back layer, there are 4 spokes for the baseline Layup 1 [[0]8 SBSL, and 8 spokes for the zero-forty five Layups 2, 3, and 4 while the helicoidal Layup 5 has 28 spokes.