Influence of Concrete Target with Pre-Drilled Cavities on the Penetration Performance of a Projectile
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摘要: 根据串联战斗部对混凝土目标的毁伤模式,将其前、后级的作用过程进行分解,结合前级对目标的预破坏,运用数值模拟分析了混凝土靶体预开孔对弹丸侵彻性能的影响,并通过实验进行了部分验证。结果表明:相同靶体开孔深度一定条件下,随着开孔数量的增加,弹丸的侵深逐渐增加,但当开孔数量增大到一定程度时,其对弹丸侵深的提高并不是很明显;当弹丸侵深未超过开孔深度时,随开孔数量增加,弹丸侵彻过载明显下降,而当弹丸侵深超过开孔深度后,开孔数量对弹丸侵彻过载的影响则不大。相同靶体开孔数量一定条件下,随着开孔深度的增加,弹丸的侵深逐渐增加;当弹丸侵深未超过开孔深度时,弹丸的侵彻过载出现明显的下降段,且开孔越深,下降段越长;而当弹丸侵深超过开孔深度后,开孔深度对弹丸侵彻过载的影响则不大。研究结果可为串联战斗部的前、后级优化设计提供参考。Abstract: The sequence of events during the impact of tandem warhead system was divided based on the damage model of tandem warhead system to concrete target.Combined with the pre damage of front shaped charge to concrete target, the influence of concrete target with pre-drilled cavities on the penetration performance of a projectile was analyzed by numerical simulation, and the analysis results were partly validated by tests.The results of research indicate that the penetration depth of projectile increases when the number of pre-drilled cavity adds with the same cavity depth, but the increase of the penetration depth of projectile is unobvious when the number of pre-drilled cavity reaches some degree.The penetration over loading of projectile decreases along with the adding of the number of pre-drilled cavity when the the penetration depth of projectile is smaller than the depth of pre-drilled cavity, and the influence is slight when the penetration depth of projectile is larger than the depth of pre-drilled cavity.The penetration depth of projectile increases when the depth of pre-drilled cavity adds with the same cavity number.When the penetration depth of projectile is smaller than the depth of pre-drilled cavity, the penetration over loading of projectile becomes a decreasing stage, and the larger the depth of pre-drilled cavity, the longer the decreasing stage.While the influence is slight when the the penetration depth of projectile is larger than the depth of pre-drilled cavity.The results of research can be refered to optimize the design of tandem warhead system.
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表 1 弹丸壳体材料参数
Table 1. Material parameters of the shell of projectile
ρ/(kg/m3) E/(GPa) ν σ0.2/(GPa) Ep/(GPa) c/(m/s) P β 7 850 210 0.3 1.44 2.1 16 2.47 0.5 表 2 靶体材料参数
Table 2. Material parameters of target
A B N C fc/(MPa) Smax G/(GPa) K1/(GPa) K2/(GPa) 0.79 1.6 0.61 0.007 40 7.0 14.86 85 -171 K3/(GPa) pcrush/(MPa) μcrush plock/(MPa) μlock T/(MPa) D1 D2 ef, min 208 13 0.001 700.0 0.10 4.0 0.04 1.0 0.01 表 3 实验工况及结果
Table 3. Test and correspongding
No. Initial mass
of projectile
/(g)Numbers of
pre-drilled
cavitiesDepth of
pre-drilled
cavities/(mm)Velocity
/(m/s)Projectile mass
after test
/(g)Losing mass
of projectile
/(%)Penetration
depth
/(mm)Dimension of
projectile cavity
/(mm×mm×mm)1 304.43 0 0 299 303.08 0.44 101 270×275×63 2 302.04 1 90 306 300.77 0.42 104 275×290×67 3 303.29 3 90 294 302.03 0.42 112 270×268×67 4 304.09 4 90 297 302.85 0.41 123 250×330×75 5 301.88 4 60 298 300.56 0.44 115 250×210×55 6 302.87 4 30 297 301.57 0.43 115 210×220×65 7 307.66 3 60 274 306.37 0.42 98 340×295×62 8 304.30 3 60 322 302.73 0.52 133 235×220×55 9 305.26 3 30 288 304.04 0.40 104 210×230×65 10 303.47 3 60 314 301.94 0.50 121 270×240×57 -
[1] Murphy M J, Baum D W, Kuklo R M, et al. Effect of multiple and delayed jet impact and penetration on contrete target borehole diameter[C]//19th International Symposium on Ballistics. Inetrlaken, Switzerland, 2001. [2] Murphy M J, Kuklo R M, Rambur T A, et al. Single and multiple jet penetration experiments into geologic materials[C]//21st International Symposium on Ballistics. Adelaide, Austria, 2004. [3] Heider N. Numerical simulation of the penetration process of geopenetrator into predamaged concrete targets[C]//20th International Symposium on Ballistics. Orlando, FL, 2002. [4] 杨世全, 常敬臻, 卢永刚, 等.战斗部对预开孔混凝土靶侵彻的数值模拟研究[J].防护工程, 2012, 34(1): 35-39. http://d.wanfangdata.com.cn/periodical/fhgc201201008Yang S Q, Chang J Z, Lu Y G, et al. Numerical simulation of warhead penetrating pre-borehole concrete target[J]. Protective Engineering, 2012, 34(1): 35-39. (in Chinese) http://d.wanfangdata.com.cn/periodical/fhgc201201008 [5] Livermore Software Technology Corporation. LS-DYNA 960 User Manual(Volume 2)[Z]. Livermore, CA: Livermore Software Technology Corporation, 2001. [6] Holmquist T J. A computational constitutive model for concrete subjected to large strains, high strain rate, and high pressures[C]//14th International Symposium on Ballistics. Québec, Canada, 1993: 591-600.