Abstract
This paper investigates ballistic performance of two different ceramic-based armor designs using finite element analysis. The first design is a bi-layer armor consists of a ceramic front layer and a Kevlar-29 composite backing layer. The second design consists of a ceramic filled honeycomb front layer and a Kevlar-29 composite backing layer. 3D finite element models are developed with the commercial software Abaqus/Explicit. The models are validated by comparing against experimental results from different sources. Both single-hit and double-hit impacts were carried out using an ogival-nosed hardened steel 4340 projectile of mass 5.5 g. The ballistic performances of the two designs are compared in terms of penetration mechanisms and ballistic resistance. It was found that the presence of honeycomb in the second armor design has a significant effect on its ballistic performance. The cell walls interrupted the stress wave propagation and confined the fracture in a local area. The ballistic limit of the second armor design in a single-hit impact decreased significantly but the resistance to a second hit did not decrease.
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