Effects of Layer Arrangements on Bullet Protection Capability of Armor Plate
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Abstract
High strength steel bulletproof plate can be made into single- or multiple-layered plate. The layer arrangement clearly influences the protection capability of the entire plate. This project aims to analyze the effect of layer arrangement on the protection capability of armour plate. An Armox500T plate was selected as the representative material. It was tested according to National Institute of Justice (NIJ) threat level 3. Experimental results demonstrated underlying deformation mechanisms of steel plate that served as validating data for a finite element model. The model was shown to correctly predict the deformed thickness and the penetrated hole of the steel plate. This validated model was modified to investigate the effects of arrangement and thickness of layers. The analysis showed that the double-layered plate is able to dissipate the impact energy of the bullet more than the single layer counterpart with the same total thickness because the thinner plates were bent out of the original shape, consuming greater impact energy and resulting in a larger deformation.
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