Recently, the need to protect people and structures against attacks of terrorists are of a high increase. The main objective of this paper is to enhance the concrete resistance against ballistic impact of high velocity projectile by using different combination layers from different materials as reinforcement for concrete and investigate their effect on the penetration depth of projectile and the resulted damage of concrete. The investigation presents the development of a finite element accurate models using AUTODYN 3D. The Lagrangian formulation numerical techniques is used to model the projectile and concrete target. The investigated models are reinforced using different layers combinations of several materials such as ceramics, fiber composite, polymer and metal: (AL2O3 - 99.7% and Kevlar- epoxy, Teflon and aluminum alloy 6061-T6) .Those materials were chosen because of their high thermal shock resistance or their great capability in energy absorption. The main findings showed a significant enhancement in the reduction of penetration depth compared to the concrete resistance without reinforcement, which demonstrate the great performance of the used combinations in the shock wave propagation. Hence from the findings of this work we can say that the concrete reinforced by ceramics or aluminum alloy with fiber composite or polymer can be used for several applications as it represents a successful anti-penetration composite structure.
Recently, the concern about protecting people and structures has increased due to the increasing number of terrorist attacks. This paper presents a numerical simulation of plain concrete blocks with an unconfined compressive strength of 35 MPA, reinforced by Teflon sheets and subjected to ballistic impact by a high-velocity rigid projectile (960 m/s). The reinforcement sheets are modeled with different thicknesses and located at different depths from the face of the concrete target. The Teflon material was chosen due to its high impact strength over a wide range of temperatures. A validation model was conducted and results showed a good agreement with previous experimental results. The investigation presents the development of a finite element accurate model using AUTODYN 3D. The Lagrangian formulation numerical technique is used to model both the projectile and the concrete target. The main findings showed an enhancement in the penetration resistance of concrete target when reinforced by Teflon sheets compared to the concrete resistance without reinforcement, where the projectile depth of penetration was reduced by 64.8% and the full damage depth of the concrete target was also reduced by 58%, which demonstrates the great performance of the chosen reinforcement in the shock wave propagation.
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