Analytical and numerical modelling of high-velocity impact on multilayer alumina/aramid fiber composite ballistic shields: Improvement in modelling approaches

In this paper, analytical and numerical models were developed to simulate the perforation of ceramic-composite targets by small-caliber projectiles. The modified Bernoulli equation has been implemented in a new analytical model to simulate the interaction between projectile and ceramic tile and an energy formulation based on the wave propagation theory has been adopted to describe energy absorption of the composite backing. The numerical model, developed with the software LS-DYNA, is based on a full-Lagrangian finite-element analysis. Both models yielded good agreement with the performed impact tests on pure alumina single tile and on multilayer Al2O3-Kevlar 29/epoxy using actual 7.62 mm NATO Ball projectile.