Abstract

This paper focuses on the study of composite concrete specimen’s resistance under an impact of AK-47 bullet with an estimated projectile’s speed of 715 m/s, and energy of 2019 J. Two sets of samples (a total of nine samples) are fabricated and tested from mortar with 1 cm steel fibers or 1 cm carbon fibers respectively. Tensile and compression tests are applied for the first set of samples, to investigate the effect of steel and carbon fibers on the strength of the specimens. Two ratios (1% and 2%) of fibers per mortar mass are also experienced before assessing the bullet resistance. For the second set of samples, three different composite sandwich configurations are tested with a rear impact test. An Armox-® 500 T plate is applied in front of mortar panels for two configurations. Results show that the addition of carbon and steel fibers to concrete panels enhances the impact resistance of concrete by keeping the panels coherent and preventing them from breaking into fragments, reducing crater diameters and detached mass. The three proposed configurations of sandwiches panels stopped the full perforation of the bullet.

摘要

本文重点研究复合混凝土试件在估计弹速715 m/s、能量2019 J的AK-47子弹冲击下的抵抗力。制作了两组样品（共9个样品），分别用 1 cm 钢纤维或 1 cm 碳纤维从砂浆中测试。对第一组样品进行拉伸和压缩试验，以研究钢和碳纤维对样品强度的影响。在评估抗弹性之前，还经历了每砂浆质量的两种纤维比例（1% 和 2%）。对于第二组样品，三种不同的复合夹层结构通过后碰撞测试进行了测试。Armox-® 500 T 板用于两种配置的砂浆板前面。结果表明，在混凝土面板中添加碳纤维和钢纤维可通过保持面板的连贯性并防止它们破碎成碎片、减小弹坑直径和分离质量来增强混凝土的抗冲击性。三种建议的三明治板配置阻止了子弹的完全穿孔。