Abstract

Reinforced concrete (RC) is widely utilized in protective structures which might be exposed to high strain rate loadings, missile impacts, explosives and accidental or intentional attacks. Though many experimental and numerical studies are available in the literature to understand and improve the ballistic performance of reinforced, pre-stressed and fiber reinforced targets of ultra high and high performance of concrete. Limited studies are available to quantify the effect of shear reinforcement in resisting the impact load. This paper is an attempt to numerically compare the ballistic performance of RC targets with steel liner and special types of shear reinforcement arrangements subjected to hard missile impact with consideration of shape of the missile nose i.e., flat nose and hemisphere nose missile. Square targets (1200 × 1200 mm) of thickness 180 mm were subjected to normal missile impact by 11.75 kg, flat nose and hemisphere nose missiles of diameter 80 mm and length 300 mm. Numerical simulations were carried out in LS-Dyna and striking velocities were varied from 100 to 150 m/s. Penetration depth, residual velocity, ejected mass and ballistic resistance of RC targets for the five distinct confinements and steel liner at rear face have been discussed and compared for the two missiles. Double Laced RC and steel liner at the rear face found to be effective in reducing the penetration depth, residual velocity and improving ballistic performance. Even though the penetration depth, residual velocity is less when the targets are subjected to flat nose compare to hemisphere nose the damage in terms of ejected mass is more in flat nose.

中文翻译：

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抗剪钢筋和钢衬对扁形和半球头导弹撞击下钢筋混凝土目标弹道阻力的影响

摘要

钢筋混凝土（RC）广泛应用于可能遭受高应变率载荷、导弹撞击、爆炸以及意外或故意攻击的防护结构。尽管文献中提供了许多实验和数值研究来了解和改善超高和高性能混凝土的增强、预应力和纤维增强目标的弹道性能。可用于量化抗剪钢筋抵抗冲击载荷的效果的研究有限。本文试图在考虑弹头形状（即平弹头和半球弹头导弹）的情况下，对带有钢衬和特殊类型抗剪加固装置的RC目标在受到导弹硬冲击时的弹道性能进行数值比较。厚度180毫米的方形目标（1200×1200毫米）受到11.75公斤、直径80毫米、长度300毫米的平头和半球头导弹的正常导弹撞击。在 LS-Dyna 中进行数值模拟，冲击速度在 100 至 150 m/s 之间变化。对两种导弹的五种不同限制和后面钢衬里的 RC 目标的侵彻深度、剩余速度、抛射质量和弹道阻力进行了讨论和比较。发现背面的双系带 RC 和钢衬可有效减少穿透深度、残余速度并提高弹道性能。尽管与半球鼻相比，当目标受到扁平鼻的影响时，穿透深度和剩余速度较小，但在扁平鼻中，弹射质量方面的损害更大。