摘要:
随着超高速武器的飞速发展,开展超高速武器战斗部侵彻混凝土遮弹层效能分析对于新建和已建防护结构的设计与安全评估具有重要意义。针对AGM-183A超高速武器战斗部打击普通强度混凝土(NSC)、超高性能混凝土(UHPC)和刚玉块石混凝土(CRC)三种典型遮弹层问题,首先通过对比钢/钨合金弹体侵彻三种靶体试验和数值仿真结果,验证有限元仿真分析方法中数值算法、网格尺寸和材料模型参数取值等的可靠性;然后基于侵彻深度和弹体残余长度等效的网格过渡策略,建立了适用于原型工况分析的数值仿真分析方法,最后对AGM-183A超高速武器战斗部以3~8Ma速度侵彻三种遮弹层开展数值模拟。结果表明:AGM-183A超高速武器战斗部分别以4Ma、4Ma和3Ma速度侵彻NSC、UHPC和CRC遮弹层的极限侵彻深度为4.26m、3.74m和1m,侵彻速度继续增大时,弹体弧柱交接处因局部应力集中发生断裂等结构失稳现象导致侵彻效能下降。与常规声速钻地武器战斗部SDB、WDU-43/B和BLU-109/B侵彻爆炸破坏深度相比,AGM-183A侵彻NSC遮弹层深度分别达到3.2、1.6和1.8倍,侵彻UHPC遮弹层深度分别达到4.7倍、2.1倍和2.2倍,侵彻CRC遮弹层深度分别达到3.4倍、1.3倍和1.5倍。三种遮弹层抗AGM-183A超高速武器战斗部侵彻的建议设计厚度分别为8.01m、7.03m和1.88m,UHPC相对NSC遮弹层抗超高速侵彻能力提升不明显,CRC遮弹层可以有效兼顾抵抗常规声速和超高速战斗部打击,建议设计优先采用。
Abstract:
With the rapid development of hypervelocity weapons, analyzing the penetration effectiveness of hypervelocity weapon warheads on concrete shield is significant for the design of newly-built protective structures and the safety evaluation of as-built protective structures. Focusing on the penetration performance of AGM-183A hypervelocity weapon warhead against three typical shields: normal strength concrete (NSC), ultra-high performance concrete (UHPC) and corundum rubble concrete (CRC), firstly, the reliability of the numerical algorithms, mesh size and material model parameters used in the finite element analysis method was fully validated by comparing the experimental and simulation results of three types of target subjected to penetration of steel/tungsten alloy projectiles. Subsequently, a numerical analysis method for prototype scenario was established based on a mesh transition strategy equivalent to penetration depth and recovered projectile length. Finally, a series of simulations were conducted for the AGM-183A hypervelocity weapon warhead penetrating aforementioned three shields at velocities ranging from 3 to 8 Ma. The results indicate that: (1) the AGM-183A hypervelocity weapon warhead reaches maximum penetration depth when NSC, UHPC and CRC shields subjected to penetration at velocities of 4 Ma, 4 Ma and 3 Ma, respectively, with depths of 4.26 m, 3.74 m and 1 m. Due to instability phenomena of projectiles, such as fractures at the junction between the head and body caused by local stress concentration, further increases in penetration velocity lead to a decrease in penetration effectiveness; (2) compared with the combined penetration and explosion damage depths of conventional sound speed penetrating warheads SDB, WDU-43/B and BLU-109/B, the penetration depths induced by AGM-183A into NSC, UHPC and CRC shields are 3.2, 1.6 and 1.8 times, 4.7, 2.1 and 2.2 times, and 3.4, 1.3 and 1.5 times higher, respectively; (3) the recommended design thicknesses of the three shields against the AGM-183A hypervelocity weapon warhead are 8.01 m, 7.03 m and 1.88 m, respectively. The UHPC shield shows no significant improvement subjected to hypervelocity penetration compared with the NSC shield. Comparatively, the CRC shield is recommended for shield design, which can be effectively subjected to both conventional subsonic and hypervelocity impacts.