Abstract
A Hybrid-Composite-Armor (HCA) insert concept for a level III NIJ 0101.06 ballistic vest standard was successfully tested using 7.62 FMJ Lead core projectiles. Improvement in ballistic performance was observed for the HCA in terms of 24% reduction of Back Face Signature (BFS) by incorporating a cellular honeycomb layer between UHMWPE laminates. This improvement is in comparison to monolith UHMWPE laminates of the same areal density as the HCA. Observations made through BFS measurements and damage zone estimation confirms the superior performance of the HCA by inclusion of the honeycomb layer. Numerical simulations in finite element code ABAQUS were carried out to verify the improvement in ballistic performance by inclusion of a honeycomb layer. Constitutive material models for strength and damage for the projectile, face-plates, and honeycomb layer were implemented and ballistic impact simulations resulting change in velocity plots were used to compare performance. Volumetric stress distributions plots were used to estimate stress transfer and damage characteristics in the backing layer. Comparisons were made for with-honeycomb, spaced plates, and non-spaced plate configurations. Simulations were capable of predicting the ballistic limit for these cases and at least showing the relative value of design changes for HCA concepts that can be used for further improvements.
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