弹体高速侵彻超高性能混凝土靶机理  

Mechanism of High-velocity Projectile Penetrating into Ultra-high Performance Concrete Target

作　　者：吕映庆 陈南勋 武海军[1] 赵宏远 张雪岩[1] Lü Yingqing;CHEN Nanxun;WU Haijun;ZHAO Hongyuan;ZHANG Xueyan(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Guangdong Zhonglu Protective Engineering Co.,Ltd.,Guangzhou 510000,Guangdong,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点实验室,北京100081 [2]广东中路防护工程有限公司,广东广州510000

出　　处：《兵工学报》2022年第1期37-47,共11页Acta Armamentarii

基　　金：国家自然科学基金项目(115772048)。

摘　　要：为研究弹体高速侵彻超高性能混凝土的现象和规律,对钢纤维体积分量为1.0%的C120超高性能混凝土和钢纤维体积分量为2.5%的C160超高性能混凝土开展准静态单轴压缩试验、劈裂抗拉试验和弹体高速侵彻试验。采用修正的美国国防研究委员会(NDRC)经验公式和量纲分析得到的经验公式,对侵彻超高性能混凝土试验中的弹体侵彻深度进行计算分析。计算和试验结果表明:相比于普通混凝土,超高性能混凝土有着较高的拉压比和优越的抗靶体表面破坏的能力,试验后靶体的表面开坑面积较小,开坑直径大约为8~12倍弹径;向外沿径向产生的裂纹较小且短,平均裂纹数量为4条;随着超高性能混凝土的强度从120 MPa提高到160 MPa,靶体表面开坑直径减小,开坑深度降低,钢纤维的加入提高了靶体的韧性,从而降低了靶体的表面开坑直径;相比于普通混凝土,超高性能混凝土的侵彻深度较小,但随着超高性能混凝土靶体的强度从120 MPa提高到160 MPa,其侵彻深度没有明显的下降;修正后的NDRC经验公式可以很好地预测弹体高速侵彻下超高性能混凝土的侵彻深度,利用量纲分析得到的侵彻深度公式可以为后续的试验预测提供参考。Ultra-high performance concrete(UHPC) is widely used in the field of protection due to its ultra-high strength and durability.In order to study the phenomenon and laws of projectile penetrating into ultra-high performance concrete,the quasi-static uniaxial compression experiment,split tensile experiment and high-speed penetration experiment of projectile are made on C120 ultra-high performance concrete with 1 vol% steel fibers and C160 ultra-high performance concrete with 2.5 vol% steel fibers.The modified NDRC empirical formula and the empirical formula obtained from dimensional analysis are used to calculate the penetration depths of projectile in the experiments.The results show that the ultra-high performance concrete has a higher tensile-compression ratio and superior ability to resist surface damage of the target compared with ordinary concrete.The area of crater on the surface of target is small,and the crater diameter is about 8-12 times the projectile diameter.The cracks generated in the radial direction are small and short,and the average number of cracks is 4.With the increase in the strength of ultra-high performance concrete,the diameter of crater on the surface of target and the depth of crater decrease,indicating that the addition of steel fiber improves the toughness of the target and reduces the diameter of crater on the surface of target.As compared with ordinary concrete,the penetration depth of ultra-high performance concrete is smaller,but as the strength of target increases,the penetration depth does not decrease significantly.The modified NDRC empirical formula and the empirical formula obtained from dimensional analysis can be used to predict the penetration depth of ultra-high performance concrete under high-speed penetration of projectile.

关 键 词：超高性能混凝土 准静态力学试验 高速侵彻 经验公式修正 

分 类 号：TJ012.4[兵器科学与技术—兵器发射理论与技术]