Specific Kinetic Energy Threshold of Impacting Initiation Covered Explosive B by Six-Prismed Tungsten Fragment
-
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.
-
Key words:
- six-prismed /
- impacting initiation /
- specific kinetic energy threshold /
- explosive B
-
图 5 破片640 m/s速度下50 μs时刻炸药的反应度云图
Figure 5. α contour of the explosive with 640 m/s at 50 μs
图 6 破片645 m/s速度下20 μs时刻的反应度云图
Figure 6. α contour of the explosive with 640 m/s at 20 μs
图 7 破片645 m/s速度下的α历史曲线和压力曲线
Figure 7. History of α and pressure at 645 m/s of fragment
图 8 不同长径比破片的冲击起爆比动能阈值及速度阈值分布
Figure 8. Specific kinetic energy and velocity threshold of impacting initiation at different length-diameter ratios
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 
下载: 导出CSV
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
下载: 导出CSV
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
下载: 导出CSV
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
下载: 导出CSV
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
下载: 导出CSV
-
[1] 梁争峰, 袁宝慧.破片撞击起爆屏蔽B炸药的数值模拟和实验[J].火炸药学报, 2006, 29(1):5-9. doi: 10.3969/j.issn.1007-7812.2006.01.002LIANG Z F, YUAN B H.Numerical simulation and experimental study of the initiation of shielded composition B impacted by fragment[J].Chinese Journal of Explosives & Propellants, 2006, 29(1):5-9. doi: 10.3969/j.issn.1007-7812.2006.01.002 [2] 张先锋, 陈惠武, 赵有守.射弹冲击引爆带壳炸药数值模拟[J].弹道学报, 2005, 17(2):24-27. doi: 10.3969/j.issn.1004-499X.2005.02.005ZHANG X F, CHEN H W, ZHAO Y S.The critical condition of shelled explosive initiated by projectile[J].Journal of Ballistics, 2005, 17(2):24-27. doi: 10.3969/j.issn.1004-499X.2005.02.005 [3] 熊冉, 李孝玉, 魏晗.破片冲击引爆带金属壳体屏蔽炸药临界条件研究[J].爆破, 2015, 32(4):136-140. doi: 10.3963/j.issn.1001-487X.2015.04.026XIONG R, LI X Y, WEI H.Critical condition of metal shelled explosive initiated by fragment [J].Blasting, 2015, 32(4):136-140. doi: 10.3963/j.issn.1001-487X.2015.04.026 [4] 傅华, 谭多望, 李涛, 等.钨射弹引爆带盖板炸药阈值工程计算方法[J].含能材料, 2008, 16(1):100-102. doi: 10.3969/j.issn.1006-9941.2008.01.028FU H, TAN D W, LI T, et al.Engineering calculation on threshold velocity of covered explosives impacted by tungsten projectile [J].Chinese Journal of Energetic Materials, 2008, 16(1):100-102. doi: 10.3969/j.issn.1006-9941.2008.01.028 [5] ROSLUND L A.Initiation of warhead fragments (Ⅰ.normal impacts): NOLTR 73-124[R].White Oak, MD: Naval Surface Weapons Center, 1973. [6] CURTIS J P, MILLS J T, LYNCH N J, et al.An analytical model for high velocity impact on confined explosive configurations [J].Int J Impact Eng, 2006, 33(1):210-218. http://www.wanfangdata.com.cn/details/detail.do?_type=perio&id=1212228a26ca8e0e716e6b36ed67f7f3 [7] 王林, 李晓辉, 刘永付, 等.基于比动能标准的战斗部杀伤威力评价方法研究[C]//2012年航空试验测试技术学术交流会.桂林, 2012. [8] 张丰收, 姚海波, 崔凤奎, 等.40Cr调质钢高速冷滚打热力耦合数值模拟[J].机械工程材料, 2014, 38(8):101-107. http://www.cnki.com.cn/Article/CJFDTotal-GXGC201408023.htmZHANG F S, YAO H B, CUI F K, et al.Research on coupled thermo-mechanical numerical simulation of high speed cold rolling for 40Cr quenched and tempered steel[J].Materials for Mechanical Engineering, 2014, 38(8):101-107. http://www.cnki.com.cn/Article/CJFDTotal-GXGC201408023.htm [9] 李银成.均匀炸药冲击起爆和起爆后的行为[J].高压物理学报, 2005, 19(3):247-256. http://www.gywlxb.cn/CN/abstract/abstract438.shtmlLI Y C.Behaviors of initiation and after-initiation for homogeneous explosives[J].Chinease Jouranl of High Pressure Physics, 2005, 19(3):247-256. http://www.gywlxb.cn/CN/abstract/abstract438.shtml [10] 李小笠, 屈明, 路中华.三种破片对带壳炸药冲击起爆能力的数值分析[J].弹道学报, 2009, 21(4):72-75. http://d.old.wanfangdata.com.cn/Periodical/ddxb200904018LI X L, QU M, LU Z H.Numerical simulation on the impact effect of three type fragments impacting steel-covered charge [J].Journal of Ballistics, 2009, 21(4):72-75. http://d.old.wanfangdata.com.cn/Periodical/ddxb200904018 -
下载:
点击查看大图
计量
- 文章访问数: 7270
- HTML全文浏览量: 3010
- PDF下载量: 111
