The steel tube-confined concrete (STCC) has a wide application prospect in protective structure. Hexagonal STCC targets have an excellent anti-penetration performance,and their anti-impact ability against both single and multiple artillery shells is superior to that of semi-infinite concrete targets. Tests for hexagonal STCC targets penetrated by 12. 7 mm armor piercing projectiles (APPs) with tungsten core at impact velocities within 600 m/s-836 m/s were conducted to study the influence of side-length of steel tube on targets'anti-penetration performance,and their failure modes and main damage parameters were obtained. The results showed that the side-length of steel tube significantly affects depth of penetration (DOP) and penetration resistance; the shorter the steel tube side-length,the smaller the DOP,the larger the penetration resistance; when the impact velocity is about 600m/s and the steel tube side-length decreases from 66 mm to 55 mm,the DOP decreases by about 19％ and the penetration resistance increases by about 17％; the DOP of hexagonal STCC targets approximately linearly increases with increase in impact velocity.%钢管约束混凝土在防护结构中具有广阔的应用前景.正六边形钢管约束混凝土靶具有优良的抗侵彻性能,其抗单发和多发打击性能明显优于半无限混凝土靶.为了研究钢管边长对抗侵彻性能的影响,进行了12.7 mm钨芯穿甲弹(撞击速度600 ～ 836 m/s)侵彻不同边长正六边形钢管约束混凝土靶试验,得到了靶的破坏模式和主要损伤参数.结果表明:钢管边长对侵彻深度和侵彻阻力有较明显的影响,边长越小,侵彻深度越小,侵彻阻力越大;撞击速度约600 m/s、钢管边长由66 mm减小到55 mm时,侵彻深度可减小约19％,侵彻阻力增大约17％;正六边形钢管约束混凝土靶的侵彻深度随着撞击速度的增大近似线性增加.
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