Numerical Studies of Penetration in Light Armor, Concrete and Brick-Wall Targets

Résumé

The accurate numerical simulation of projectile penetration process is a complex challenge. Experimental
investigation of these time-dependent non-linear events is expensive and time-consuming. In this paper, 3-D
numerical simulations are carried out to estimate the penetration performance of designed penetrators against
the double and triple brick-wall, plain concrete wall and light armor targets at impact velocities of 120 to 300
m/s, undergoing normal and oblique impacts. In all simulations, both the projectile and targets are modeled
using Lagrange solver facility, available in ANSYS/Autodyn. During penetration process, targets experience
severe grid deformation in the region local to the penetrator. Highly distorted elements are removed from the
calculation using erosion strain algorithm. The simulation results suggest that at maximum velocity flat-nose
(FN) projectile successfully perforate all the targets with significant residual velocity, for both normal and
maximum oblique impact scenarios. For impact velocity of 120 m/s, the FN projectile perforated the armor
and concrete targets but was not able to penetrate and cross through these targets. However, both brick-wall
targets were perforated at normal and maximum oblique angle with sufficient residual velocity. The
validation of the calculated results and numerical setup were made with experiments against double and triple
brick-wall targets for impacting velocity of 170 m/s. Good agreement between the experimental and
estimated projectile residual velocity has been achieved. In contrast to FN projectile, the ogive-nose
penetrator calculated results has shown ricocheting behavior on impacting the light armor target at minimum
velocity and maximum obliquity. The FN projectile has shown better perforation and penetration
performance against light armor and domestic targets. The projectile minimum velocity is also estimated
numerically to fully penetrate three different types of targets. These results would be beneficial for the
designers and operators to get the desired performance against domestic and light armor targets with
sureness.
Keywords: Numerical simulation, Oblique impact, Perforation, Penetration, Brick-wall