The Pilot Study On Anti-penetration Characteristics Of SFRC Shielded Structure With Tightly Arrayed Corundum Spheres

By making use of numerical simulation and experiment methods, we studied the shielded structure of steel fiber reinforced concrete (SFRC) with tightly arrayed corundum spheres.Eight kinds of targets have been experimentally studied with long-rod projectile: the experimental results indicate: when single layer tightly arrayed φ 8 mm corundum spheres in different depths of the targets, the anti-penetration characteristics of the targets are more and more weaker while the corundum spheres is more deeper. The performance is 7%-9.8% weaker when the corundum spheres in 70 mm than that in 40 mm.While the single layer tightly arrayed corundum spheres in the same depth (55 mm), but the corundum spheres' diameters are different, the anti-penetration characteristics of the targets with φ15mm spheres is in evidence better than that of the targets with <|>8 mm spheres. Its performance is 9.5% better. When the unit area corundum mass is same, the anti-penetration characteristics of the targets with φ15mm corundum spheres are 10% better than that of the targets with double φ8 mm corundum spheres. We also prove that the diameter of the corundum sphere is important for anti-penetration ability.The long rod projectile penetrating into the targets are simulated by the dynamic finite element analysis software LS-DYNA. The results indicate: when the projectile impact the targets with single layer tightly arrayed φ7 mm corundum spheres, the anti-penetration ability become weaker while the projectile impact the balls from top to interspaces, but the performance is still 14% better than that of SFRC. The anti-penetration characteristics of the targets become weaker while the corundum spheres become deeper. The performance is 5%~10% weaker when the corundum spheres in 55 mm than that in 20 mm. While the corundum spheres in the same depth, but their diameters are different, the anti-penetration characteristics of the targets with φ14 mm spheres is in evidence better than that of the targets with φ7 mm spheres. When the unit area corundum mass is same, the anti-penetration ability of the targets with φ14 mm corundum spheres are better than that of the targets with double φ7 mm corundum spheres.The results of the two methods are almost identical, they can give us a guide for design the shielded structures. We can say the steel fiber reinforced concrete with tightly arrayed corundum spheres is an effective new shielded structure.