A simple plasticity-based model is used to predict the ballistic performance of multi-layer metallic targets impacted by fragment simulating projectiles (FSPs). Perforation is treated as a process of indentation on the impact side of the target and either shear, dishing or ductile hole formation failure on the exit side, depending on target configuration and plate thickness. Good predictions are given of the ballistic limits of multi-plate spaced arrays composed of thin plates that have been impacted by FSPs of a range of masses and diameters. Good estimates are also made of the ballistic limits of various homogeneous and bi-layer laminates, and the performance differences between differently configured laminates are distinguished. Provided there is minimal projectile deformation, the model is reasonably accurate for impacts on a wide range of target configurations.
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