破片撞击损伤装药点火数值模拟
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摘要
为了研究冲击波和破片撞击复合作用下装药点火机理,采用先冲击波损伤装药、后破片撞击已损伤装药的实验方法,获得受冲击装药点火对应的破片临界撞击速度为446.9～449.4 m·s~(-1)。采用LS?DYNA程序,基于节点约束?分离法对装药冲击波损伤进行数值模拟,而后用完全重启动方法对冲击损伤装药在破片撞击下的点火反应过程进行二次模拟,通过"升?降"法得到受冲击损伤装药点火对应的破片临界撞击速度为452～453 m·s~(-1),实验和数值模拟结果吻合较好。结果表明,可采用节点约束?分离方法和完全重启动数值模拟技术进行冲击波和破片复合作用下装药点火数值模拟;受冲击波损伤装药的破片撞击点火临界速度明显要低于未损伤装药,装药受损伤状态对破片撞击感度起到了敏化作用,从而降低了破片撞击点火的临界速度。
To study the ignition mechanism of charge under the combined action of shock wave and fragment impact,the critical impact velocity of fragment corresponding to the ignition of impacted charge obtained by the experimental method of first com ?pacting charge by shock wave and then impacting damaged charge by fragment was 446.9-449.4 m·s~(-1). LS?DYNA program was used to numerically simulate the shock wave damage of charge based on the nodal constraint?separation method. Then,second?ary simulation to the ignition reaction process of impact damaged charge under fragment impact was performed by full restart method. The critical impact velocity of fragment corresponding to the ignition of impact damaged charge obtained by"up?down"method is from 452 m ·s~(-1) to 453 m ·s~(-1),the experimental and numerical results are in good agreement. Results show that the nodal constraint?separation method and the full restart numerical simulation technology can be used to simulate the ignition of charge under the combined action of shock wave and fragments,the critical velocity of fragments impact ignition of charge dam ?aged by shock wave is lower than that of non?damaged charge,and the damaged state of charge sensitizes the impact sensitivity of fragments. This reduces the critical velocity of fragment impact ignition.
To study the ignition mechanism of charge under the combined action of shock wave and fragment impact,the critical impact velocity of fragment corresponding to the ignition of impacted charge obtained by the experimental method of first com ?pacting charge by shock wave and then impacting damaged charge by fragment was 446.9-449.4 m·s~(-1). LS?DYNA program was used to numerically simulate the shock wave damage of charge based on the nodal constraint?separation method. Then,second?ary simulation to the ignition reaction process of impact damaged charge under fragment impact was performed by full restart method. The critical impact velocity of fragment corresponding to the ignition of impact damaged charge obtained by"up?down"method is from 452 m ·s~(-1) to 453 m ·s~(-1),the experimental and numerical results are in good agreement. Results show that the nodal constraint?separation method and the full restart numerical simulation technology can be used to simulate the ignition of charge under the combined action of shock wave and fragments,the critical velocity of fragments impact ignition of charge dam ?aged by shock wave is lower than that of non?damaged charge,and the damaged state of charge sensitizes the impact sensitivity of fragments. This reduces the critical velocity of fragment impact ignition.
引文
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[3]孙宝平,段卓平,张震宇,等.冲击波和破片复合作用下炸药起爆数值模拟[J].爆炸与冲击,2013,33(增刊):40-46.SUN Bao-ping,DUAN Zhuo-ping,ZHANG Zhen-yu,et al.Numerical simulation on initiation of charge under combined action of shock wave and fragment impact[J].Explosion and Shock Waves,2013,33(Suppl.):40-46.
[4]王树山,李朝军,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 Armamentarii,2001,22(2):189-191.
[5]欧阳昌明,段卓平,孙宝平,等.冲击波和破片复合作用下装药起爆实验研究[J].爆炸与冲击,2013,33(增刊):63-66.OUYANG Chang-ming,DUAN Zhuo-ping,SUN Bao-ping,et al.Experimental study on initiation of charge under combined shock wave and fragment impact[J].Explosion and Shock Waves,2013,33(Suppl.):63-66.
[6]孙宝平,段卓平,马兆芳,等.侵彻过程中装药摩擦点火数值模拟[J].北京理工大学学报,2012,32(8):771-775.SUN Bao-ping,DUAN Zhuo-ping,MA Zhao-fang,et al.Numerical simulation on frictional ignition of charge during projectile penetration[J].Transactions of Beijing Institute of Technology,2012,32(8):771-775.
[7]周风华,王礼立,胡时胜.有机玻璃在高应变率下的损伤型非线性粘弹性本构关系及破坏准则[J].爆炸与冲击,1992,12(4):333-342.ZHOU Feng-hua,WANG Li-li,HU Shi-sheng.A damage-modified nonlinear visco-elastic constitutive relation and failure criterion of PMMA at high strain-rates[J].Explosion and Shock Waves,1992,12(4):333-342.
[8]Menikoff R.Constitutive model of polymethyl methacrylate at high pressure[J].Journal of Applied Physics,2004,96(12):7696-7704.
[9]Christiansen A W,Baer E,Radcliffe S V.The mechanical behaviour of polymers under high pressure[J].Philosophical Magazine,1971,24(188):451-467.
[10]Resnyansky A D,Bourne N K,Millett J C F,et al.Constitutive modeling of shock response of polytetrafluoroethylene[J].Journal of Applied Physics,2011,110(3):033530-1-15.
[11]Khishchenko K V,Charakhch Yan A A,Fortov V E,et al.Shock compression of some porous media in conical targets:numerical study[J].Journal of Applied Physics,2011,110(5):053501-1-11.
[12]Casem D T.Mechanical response of an Al-PTFE composite to uniaxial compression over a range of strain rates and temperatures[R].M D:U.S.Aberdeen Proving Ground ARL-TR-4560,2008.
[13]Johnson G R,Cook W H.A constitutive model and data for metals subjected to large strains,high strain rates and high temperatures[C]//Proceedings of the 7th International Symposium on Ballistics,Netherlands:1983.
[14]孙宝平,段卓平,皮爱国,等.炸药剪切点火数值模拟[J].兵工学报,2011,32(增刊1):310-315.SUN Bao-ping,DUAN Zhuo-ping,PI Ai-guo,et al.Numerical simulation of shear ignition of explosives[J].Acta Armamentarii,2011,32(Suppl.1):310-315.
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