Penetrating and Damaging Effects of a Split Kinetic EnergyProjectile on Concrete Targets
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摘要: 为探索新型主动式钻地原理，提出了一种分体式动能子弹的结构形式。采用有限元仿真软件AUTODYN模拟了弹丸侵彻混凝土的过程，并通过靶场实验验证了数值计算结果。另外，还利用分形几何理论方法对分体式动能子弹对混凝土靶的毁伤破碎效果进行了定量评估。结果表明：在侵彻过程中，采用分体式弹丸结构，能够有效提高对岩土类目标介质的横向作用范围。分体式动能子弹侵彻后，素混凝土靶的破碎分布近似符合统计分形规律，可以用分形维数表征其破碎效应。Abstract: In this paper, to explore the mechanism of advanced active earth-penetrating weapons, we propose a split kinetic energy projectile.The target penetrating processes of the split projectile were analyzed using the finite element method, and the calculation model was verified by comparing the results obtained from simulation and experiment.Moreover, the crushing characteristics of the concrete target were evaluated adopting the fractal geometry method.The results show that the split kinetic energy projectile can significantly improve the lateral damage capability when applied to rock or soil targets.Besides, the cumulative mass distribution of the plain concrete fragments is fairly consistent with the statistical fractal rules, indicating that the fractal dimension is a good parameter to describe the projectile's crushing characteristics.
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Key words:
- split projectile /
- penetration /
- fragment effect /
- fractal geometry
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图 2 分体式动能弹结构与作用原理
Figure 2. Structure and mechanism of split kinetic energy projectile
表 1 弹体的材料参数
Table 1. Material parameters of projectile
ρ/(g/cm3) Y/(MPa) B/(MPa) C Np Mp D1 D2 D3 D4 D5 7.83 792 510 0.014 0.26 1.03 0.05 3.44 -2.12 0.002 0.61 
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表 2 混凝土靶材料参数
Table 2. Material parameters of concrete target
fc/(MPa) G/(GPa) Q M′ N′ pspall* B′ A′ 41 17.7 0.6805 0.61 9040 0.1 1.22 1.6 T1/(GPa) T2/(MPa) Gf/(J/m2) α δ D′1 D′2 35.2 0 113.8 1.25×10-2 9.09×10-3 0.04 1.0
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表 3 实验结果统计
Table 3. Statistical results for experiments
v/(m/s) d/(mm) hc/(mm) V/(cm3) hmain/(mm) hassistant/(mm) n 400 245 60 900 78 41 2 417 257 62 1100 81 47 2 434 285 67 1300 84 4
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