炸药撞击刚性靶板的试验和数值模拟
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摘要
基于"节点约束-失效法"对药柱撞击刚性靶板的过程进行了数值模拟,计算出了撞击过程中炸药的变形、破碎和飞散,并与欧拉方法的计算结果进行了对比。采用热-力-化耦合模型计算得到了炸药的温升曲线和点火速度阈值,该速度阈值与实验结果相吻合。研究结果表明:炸药在撞击过程中发生大变形、破碎和飞散现象,炸药点火位置位于药柱撞击面上,炸药点火是在撞击压缩和摩擦的联合作用下撞击面局部温度快速升高引起。
The "node constrained-failure method"was used to simulate the process of explosive charge impact with rigid target plate,and the large deformation,fragmentation and dispersion of the explosive was calculated,after that the comparison between "node constrained-failure method"and Euler method was made.Thermal-mechanical-chemistry model was also used to calculate the temperature curve and ignition critical velocity,and the calculation result accorded with the test result.According to the numerical simulation,the explosive charge undergo deformation and fragmentation during the impact process,the ignition location is on the impact surface,the ignition of explosive is a combined mechanism including compression and friction that cause local temperature rise rapidly.
The "node constrained-failure method"was used to simulate the process of explosive charge impact with rigid target plate,and the large deformation,fragmentation and dispersion of the explosive was calculated,after that the comparison between "node constrained-failure method"and Euler method was made.Thermal-mechanical-chemistry model was also used to calculate the temperature curve and ignition critical velocity,and the calculation result accorded with the test result.According to the numerical simulation,the explosive charge undergo deformation and fragmentation during the impact process,the ignition location is on the impact surface,the ignition of explosive is a combined mechanism including compression and friction that cause local temperature rise rapidly.
引文
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[2]YURLOV A V,PUSHKOV V A,NAIDANOVA T G,et al.Response of an HMX Based Explosive to Dynamic Loading by the Hopkinson Split Bar Technique[J].Combustion Explosion and Shock Waves,2016,52(4):493-496.
[3]田轩,徐洪涛,冯晓军,等.低速撞击下JO-8和B炸药的响应特性[J].含能材料,2015,23(9):903-907.
[4]屈可朋,沈飞,王世英,等.RDX基PBX炸药在不同应力率下的撞击安全性[J].火炸药学报,2014,37(6):40-43.
[5]南海,高立龙,郭昕,等.浇注PBX炸药药柱的动态撞击性能[J].火炸药学报,2010,33(5):36-38.
[6]余同希,邱信明.冲击动力学[M].北京:清华大学出版社,2011:20-26.
[7]董海山,周芬芬.高能炸药及相关物性能[M].北京:科学出版社,1989:59-65.
[8]白金泽.LS-DYNA3D理论基础与实例分析[M].北京:科学出版社,2005:161-166.
[9]乔金超,吴越,贾磊朋,等.双层复合线型药型罩侵彻靶板的数值分析[J].兵工自动化,2017(9):27-30.
[10]JOHN O.Hallquist.LS-DYNA theory manual[R].Livermore,USA:Livermore Software Technology Corporation,2006:277-279.