Specific Kinetic Energy Threshold of Impacting Initiation Covered Explosive B by Six-Prismed Tungsten Fragment
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摘要: 为了研究钨合金六棱柱冲击起爆带壳B炸药比动能阈值,设计并实施了破片冲击带壳B炸药实验。基于实验数据,利用Autodyn-3D建立可信的仿真模型,计算得到了实验条件下的钨合金六棱柱冲击起爆比动能阈值。利用已验证的仿真模型,选取典型的六棱柱破片的外形尺寸,利用“升降法”求得破片的冲击起爆比动能阈值,绘制了相关曲线,并与同等情况下的速度阈值进行比较。结果表明,实验条件下的冲击起爆阈值为34.780 MJ/m2,在炸药及壳体一定的情况下,大长径比破片冲击起爆带壳B炸药的比动能阈值较大。Abstract: To study the specific kinetic energy threshold of impacting initiation covered explosive B by six-prismed tungsten fragment, an experiment of impacting covered explosive B by fragments was designed and carried out.Based on the experiment data, using the Autodyn-3D finite software, simulation models were established and used to calculate the specific kinetic energy threshold of impacting initiation covered explosive B by six-prismed tungsten fragment.Based on the proven simulation, specific kinetic energy threshold of impacting initiation of typical size fragments were calculated by the up-down method, and the related curves were drawn.The specific kinetic energy threshold and velocity threshold were compared in the same circumstance.The results show that the specific kinetic energy thresholds of impacting initiation of experiment is 34.780 MJ/m2 and, with a given charge and shell, fragments with a larger length to diameter ratio will have a higher kinetic energy to initiate the explosive.
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Key words:
- six-prismed /
- impacting initiation /
- specific kinetic energy threshold /
- explosive B
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表 1 实验结果
Table 1. Experiment results
Fragment v/(m/s) Specific kinetic energy Threshold/(MJ/m2) Result Six prism 537 24.162 Non-Explosion Six prism 585 28.674 Non-Explosion Six prism 664 36.941 Explosion Six prism 746 46.562 Explosion Six prism 800 53.504 Explosion Six prism 1 162 112.880 Explosion 表 2 40Cr调质钢的Johnson-Cook模型参数[8]
Table 2. Johnson-Cook parameters of 40Cr quenched and tempered steel[8]
A/(MPa) B/(MPa) C m n Tr/(K) ε0/(s-1) Tm/(K) 905 226 0.03 0.83 0.21 20 0.04 1 673 表 3 B炸药的点火模型参数
Table 3. The major parameters of explosive B
I/(s-1) b a x G1 c d y G2 e g z 44×106 0.667 0 7 850 0.222 0.667 2 660 0.333 1 3 表 4 材料的侵蚀因子
Table 4. Erosion factors of materials
Material Erosion type Erosion factor Tungsten alloy Geometric strain 1.5 40Cr Geometric strain 1.5 Explosive B Geometric strain 1.5 表 5 不同长径比下的比动能阈值
Table 5. Specific kinetic energy threshold under different λ
λ Specific kinetic energy threshold/(MJ/m2) Same area Same mass 0.15 6.41 - 0.25 8.97 - 0.50 17.39 10.25 0.75 26.08 20.87 1.00 34.78 34.78 1.50 52.17 70.12 2.00 69.56 114.78 2.50 86.95 168.94 3.00 104.34 227.86 -
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