蜂窝钢管约束混凝土靶抗多发打击试验研究

Experimental investigation on cellular steel-tube-confined concrete targets under multi-hit of projectiles

混凝土广泛应用于防护结构,对混凝土施加约束可以有效改善其脆性,从而提高其抗弹性能。钢管约束混凝土抗侵彻性能优良,在防护结构中具有广阔的应用前景。为了研究蜂窝钢管约束混凝土的抗侵彻性能,推进钢管约束混凝土的工程应用,进行了蜂窝钢管约束混凝土靶(STCC)和半无限靶抗12.7 mm穿甲弹多发打击对比试验,得到了靶体损伤模式,测量了漏斗坑的体积与深度等损伤参数,计算了蜂窝钢管约束混凝土靶等效侵彻阻力,分析了先发打击对后发打击的影响。结果表明:蜂窝钢管可将弹丸侵彻产生的混凝土损伤限制在被打击单元内,其核心混凝土的损伤模式为“漏斗坑+侵彻隧道+侧面裂纹”;与半无限混凝土靶相比,蜂窝钢管约束混凝土靶抗4发打击的侵彻深度(DOP)可减小约18%,抗6发打击的漏斗坑体积与深度分别可减小约78%和55%,其抗多发打击性能明显优于半无限混凝土靶。

Concrete is widely used in protective structures,and its brittleness can be effectively improved by imposing cofiniement on the concrete,which makes the anti-penetration performance enhanced.Steel-tube-confined concrete(STCC)has excellent anti penetration performance and wide potenial application in protective structures.In order to study the anti-penetration performance of STCC targets and promote the engineering application,tests on cellular STCC targets and comparative semi-infinite targets under multi-hit of 12.7 mm armor piercing projectiles were conducted,and the corresponding damage modes and parameters were obtained.Moreover,the equivalent penetration resistance of cellular STCC targets was calculated,and the influence of the formerimpact on the subsequent impacts was analyzed.The results show that the confinement of steel tube on concrete can limit the damage zone of concrete within impacted STCC cells;the damage mode of concrete includes the phenomena of funneled crater,penetrating tunnel and side crack;in comparison with the semi-infinite concrete targets,the depth of penetration(DOP)of the cellular STCC targets after the fourth impact is reduced by about 18%and the volume and depth of the funneled crater after the sixth impact are reduced by around 78%and 55%,respectively,which shows that the multi-hit performance of cellular STCC targets is better than that of semi-infinite concrete targets.