Numerical simulation for analyzing shock to ignition of PBXs with different compositions in meso-structural level
-
摘要: 建立了炸药颗粒自由堆积三维计算模型，考虑了炸药颗粒尺寸和位置的随机分布、粘结剂对炸药颗粒的包覆和不同组分炸药颗粒间的级配；采用非线性有限元方法，对炸药颗粒由自由堆积到密实装药的压药过程进行模拟，构建了PBX炸药细观结构模型；对多元PBX炸药（HMX+TATB+Estane）细观结构冲击点火过程进行了计算，考虑冲击作用下炸药内部热力耦合作用和自热反应，计算不同组分比例混合炸药的冲击点火性能，分析了炸药组分对冲击点火的影响。研究表明TATB含量增加，混合炸药冲击感度降低。Abstract: By considering the particle size, location in random distribution and the composite content, a three-dimensional computation model was developed for explosive particles in free deposition.The pressing process of the explosive particles from free deposition to molded explosives was numerically simulated by using the non-linear finite element method.Based on the above, the meso-structural models of PBXs(HMX+TATB+Estane)were established.Thereby, numerical simulations were conducted to analyze the shock-to-ignition processes of the PBXs with different compositions in the meso-structural level.In the above numerical simulations, the thermo-mechanical coupling effect and the self-sustained thermal reaction within the PBXs were taken into account.The influences of the composition contents on the shock-to-ignition performances of the PBXs were discussed.The simulated results show that the composite explosives containing HMX and TATB become less sensitive as the TATB content in them increases.
-
图 3 压制过程炸药在不同时刻的变形
Figure 3. Deformation of explosive particles at different times during compression
图 12 炸药内部监测点温度时间变化曲线
Figure 12. Calculated temperature-time curves of selected elements
图 14 临界点火压力随HMX质量分数变化曲线
Figure 14. Critical pressure of ignition varied with mass fraction of HMX
表 1 材料参数
Table 1. Material parameters
材料 ρ/(kg·m-3) G/GPa σy/GPa c/(m·s-1) s γ0 HMX 1 900 2.700 0.10 2 901 2.058 1.100 TATB 1 876 1.700 0.08 1 745 1.993 1.097 Estane 1 100 0.270 0.01 2 350 1.700 1.000 Steel 7 850 79.000 1.85 4 570 1.490 1.930 
下载: 导出CSV
-
[1] Mader C L, Kershner J D. The heterogeneous explosive reaction zone[C]//Proceedings of 9th International Symposium on Detonation. Portland, Oregon, USA, 1989. [2] Conley P A, Benson D J. Microstructural effects in shock initiation[C]//Proceedings of 11th International Symposium on Detonation. Snowmass, Colorado, 1998: 768-787. [3] Baer M R. Modeling heterogeneous energetic materials at the mesoscale[J]. Thermochimica Acta, 2002, 384: 351-367. doi: 10.1016/S0040-6031(01)00794-8 [4] 尚海林, 赵锋, 王文强, 等.冲击作用下炸药热点形成的3维离散元模拟[J].爆炸与冲击, 2010, 30(2): 131-140. http://www.bzycj.cn/article/id/8376Shang Hai-lin, Zhao Feng, Wang Wen-qiang, et al. Three-dimensional discrete element simulation of hot spots in explosives under shock loading[J]. Explosion and Shock Waves, 2010, 30(2): 131-140. http://www.bzycj.cn/article/id/8376 [5] Barua A, Zhou M. A Lagrangian framework for analyzing microstructural level response of polymer-bonded explosives[J]. Modelling and Simulation in Materials Science and Engineering, 2011, 19(5): 1-24. doi: 10.1088/0965-0393/19/5/055001/pdf [6] Lawrence Livermore National Laboratory. LS-DYNA user's manual[M]. California: Lawrence Livermore National Laboratory, University of California, 2001. [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: 334-340. [8] Gibbs T R, Popolato A. LASL explosive property data[M]. California: University of California Press, 1980: 6-7, 156-157. -
点击查看大图
计量
- 文章访问数: 3414
- HTML全文浏览量: 312
- PDF下载量: 603
- 被引次数: 0