Numerical and experimental study of an ogival projectile vertical perforating a medium thickness concrete target
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摘要: 为研究卵形弹丸贯穿中等厚度混凝土靶体的贯穿规律，开展直径60 mm尖卵形弹丸贯穿不同厚度混凝土靶体的侵彻实验，获得了不同撞击速度的弹丸贯穿不同厚度混凝土靶体的剩余速度规律。结合无网格SPH方法、RHT混凝土本构以及状态方程，对贯穿实验进行数值模拟，对不同工况下的弹丸过载规律以及靶体的损伤过程的分析发现：弹丸贯穿中等厚度混凝土靶体的贯穿过程分为开坑阶段、隧道稳定侵彻阶段以及靶背影响出靶阶段，在相同初始撞击速度下的靶背影响区的厚度随着靶体厚度的增加而增大。实验结果与数值模拟结果对比，表明模型能够有效模拟弹丸贯穿混凝介质问题，研究结果可为贯穿机理的研究提供参考。Abstract: In order to understand the law dominating the process of an ogival projectile perforating a medium thickness concrete target, the tests of the ogival projectiles of 60 mm diameter perforating concrete targets of (10-30)D thickness were carried out. The effect of concrete thickness on residual velocity was obtained in the tests. The meshless SPH method, combing the RHT concrete constitutive model and the p-α equation of state, was used to simulate perforation tests. Simulation results on perforation acceleration and damage process reveal that there are three stages in the perforation process, including catering, tunneling, and rear effect zone. Furthermore, the range of rear effect zone increases with increasing concrete thickness at the same projectile velocity. The comparison between the experimental results and the simulation results show that the current simulation model is able to simulate projectiles perforating concrete targets, and the simulation results provide insight into the perforation mechanisms.
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Key words:
- penetration mechanics /
- target plate thickness /
- ogival projectile /
- vertical perforating
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图 13 3个分界时刻的损伤云图
Figure 13. Damage contour of different stages in penetration process at three instants of time
表 1 实验结果
Table 1. Experimental results
实验编号 H/m H/D m/kg vi/(m·s-1) vr/(m·s-1) 1 0.6 10.0 4.152 639.6 308.0 2 0.8 13.3 4.153 650.2 203.8 3 1.0 16.7 4.152 643.0 0 4 1.4 23.3 4.134 1 077.8 534.7 5 1.6 26.7 4.157 1 070.0 471.0 6 1.8 30.0 4.133 1 047.0 349.5 
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表 2 靶背影响区弹丸消耗的能量情况
Table 2. Energy consumption of projectile in rear free surface effectzone
实验编号 H/D 进入靶背影响区的速度/(m·s-1) 弹丸消耗的能量/J 1 10.0 460 1.4×105 2 13.3 434 2.8×105 3 16.7 428 3.8×105 4 23.3 630 2.0×105 5 26.7 541 2.2×105 6 30.0 502 3.2×105
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表 3 侵彻过程中3个阶段厚度的数值模拟结果
Table 3. Simulation results of thickness of three stages in penetration process
实验 H/D 开坑区/D 隧道区/D 靶背影响区/D 1 10.0 2.0 4.9 3.1 2 13.3 2.0 5.7 5.6 3 16.7 2.0 6.0 8.7 4 23.3 2.0 18.1 3.2 5 26.7 2.0 20.9 3.8 6 30.0 2.0 21.9 6.1
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