大质量钨破片冲击多层间隙盖板炸药数值模拟与试验研究
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摘要
为分析大质量破片对多层盖板炸药冲击起爆阈值的影响因素,采用SPH和FEM相结合的方法开展了不同盖板厚度和不同盖板间隔情况对起爆阈值影响的数值模拟。在此基础上,采用二级轻气炮作为加载手段,进行了大质量钨合金破片冲击不同盖板及间隙情况下炸药冲击起爆试验研究,获得了起爆阈值。数值模拟与试验结果相一致,表明采用SPH与FEM相结合的方法可以较好地模拟此类问题。通过拟合得到了大质量破片冲击起爆阈值速度与冲击角度之间的经验关系式。分析结果表明,大质量破片冲击产生的大量二次破片对起爆阈值速度和起爆延迟时间具有较大的影响。
In order to investigate the influence factor of large-mass fragments on shock initiation,the smoothed particle hydrodynamics( SPH) and finite element method( FEM) was combined,and the influence of different thinckness and different spacing of cover plates on initiation threshold was numerically simulated.The two-stage gas gun was applied,and the experiment of large-mass tungsten fragments impacting explosive was carried out.The critical initiation velocity was obtained.The simulation results are consistent with experimental results,and the SPH/FEM coupling method can be applied to analyze the velocity shock initiation problem. The correlations between critical initiation velocity and oblique impact angle were obtained by data fitting.Results show that the secondary fragments deriving from tungsten fragments have an important effect on the initiation velocity and the initiation delay-time.
In order to investigate the influence factor of large-mass fragments on shock initiation,the smoothed particle hydrodynamics( SPH) and finite element method( FEM) was combined,and the influence of different thinckness and different spacing of cover plates on initiation threshold was numerically simulated.The two-stage gas gun was applied,and the experiment of large-mass tungsten fragments impacting explosive was carried out.The critical initiation velocity was obtained.The simulation results are consistent with experimental results,and the SPH/FEM coupling method can be applied to analyze the velocity shock initiation problem. The correlations between critical initiation velocity and oblique impact angle were obtained by data fitting.Results show that the secondary fragments deriving from tungsten fragments have an important effect on the initiation velocity and the initiation delay-time.
引文
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[3]张宝平,张庆明,黄风雷.爆轰物理学[M].北京:兵器工业出版社,2001:340-344.ZHANG Bao-ping,ZHANG Qing-ming,HUANG Feng-lei.Detonation physics[M].Beijing:Ordnance Industry Press,2001:340-344.(in Chinese)
[4]HELD M.Initiation phenomena of uncovered or covered high explosive charges by jets or projectile[C]//Proceedings of the 3rd International Autumn Seminar on Propellants,Explosive,and Pyrotechnics.Chengdu:Sichuan Publishing House of Science&Technology,1999:273-289.
[5]LEE E L,TARVER C M.Phenomenological model of shock initiation in heterogeneous explosives[J].Journal of Phys,Fluids,1980,23(12):2 362-2 372.
[6]CHEN J K,CHING H K,ALLAHDADI F A.Shock-induced detonation of high explosives by high velocity impact[J].Journal of Mechanics of Materials and Structures,2007,2(9):1 701-1 721.
[7]URTIEW P A,VANDER K S,TARVER C M,et al.Shock initiation experiments and modeling of composition B and C-4[C]//Proceedings of the 13th International Detonation Symposium.Norfolk,VA:Office of Naval Research,2006:55-61.
[8]王树山,李朝君,马晓飞,等.钨合金破片对屏蔽装药撞击起爆的实验研究[J].兵工学报,2001,22(2):189-191.WANG Shu-shan,LI Chao-jun,MA Xiao-fei,et al.An experimental study on the initiation of covered charge impacted by tungsten alloy fragments[J].Acta Armamentii,2001,22(2):189-191.(in Chinese)
[9]MURPHY M J,LEE E L.Modeling shock initiation in composition B[C]//The 10th International Detonation Symposium.Los Alamos,NM:Los Alamos National Laboratory,1993:73-84.
[10]梁斌,冯高鹏,魏雪婷.多枚破片冲击引爆带盖板炸药数值模拟分析[J].弹箭与制导学报,2013,33(6):43-47.LIANG Bin,FENG Gao-peng,WEI Xue-ting.Numerical simulation on shock initiation of composition explosive of cover board subjected to multi-fragment[J].Journal of Projectiles,Rockets,Missiles and Guidance,2013,33(6):43-47.(in Chinese)
[11]赵海军,卢永刚,梁斌.多层盖板炸药在钨破片撞击下起爆数值模拟研究[J].四川兵工学报,2015(5):75-78.ZHAO Hai-jun,LU Yong-gang,LIANG Bin.Study on numerical simulation of multilayer plate explosive detonated by tungsten fragment impact[J].Journal of Sichuan Ordnance,2015(5):75-78.(in Chinese)
[12]LAWRENCE W,STARKENBERG J,KRZEWINSKI B.Secondary effects on projectile impact shock initiation[C]//Proceedings of the 13th International Detonation Symposium.Norfolk,VA:Office of Naval Research,2006:839-846.
[13]崔凯华,洪滔,曹结东.射弹冲击带盖板Comp B装药起爆过程数值模拟[J].含能材料,2010,18(3):286-289.CUI Kai-hua,HONG Tao,CAO Jie-dong.Numerical simulation of shock initiation in covered composition B by projectile impact[J].Chinese Journal of Energetic Materials,2010,18(3):286-289.(in Chinese)
[14]Century Dynamics Corporation.AUTODYN users manual[M].California:Century Dynamics Corporation,2005:234-249.
[15]郑平刚,赵锋,张振宇.圆头钢弹对PBX-9404炸药撞击起爆的数值模拟[J].高压物理学报,2002,16(1):29-34.ZHENG Ping-gang,ZHAO Feng,ZHANG Zhen-yu.Numerical simulation of initiation of PBX-9404 impacted by round-nosed steel projectiles[J].Chinese Journal of High Pressure Physics,2002,16(1):29-34.(in Chinese)