Simulation of flyers driven by detonation of copper azide
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摘要: 为了优化叠氮化铜微装药器件的设计，探究叠氮化铜爆轰驱动飞片的作用原理，根据微装药器件的实际设计和相关实验，采用ANSYS/LS-DYNA流固耦合算法对叠氮化铜爆轰驱动飞片的作用过程作了数值模拟。具体研究了加速膛长度对飞片的平整性和完整性的影响，分析了微装药的尺寸与飞片速度之间的关系。研究结果表明：加速膛的长度对飞片的完整性、平整性和速度具有重要影响，在过长的加速膛中飞片飞行时易发生破碎，加速膛过短飞片的驱动速度不能达到最佳。装药尺寸与飞片速度之间关系密切，装药直径对飞片速度的前期成长影响不大，但对飞片获得的最大速度却有较为明显的影响；装药的直径大于0.8 mm时，增加装药直径并不能使飞片的最大速度明显增加。Abstract: Aim to optimize the design of MEMS copper azide fuze and investgate the mechanism underlying the process of the copper azide explosive-driven flyer plate. According to the actual design of the micro-charge fuze and its related experiments, the process of the copper azide explosive-driven flyer plate was simulated adopting the fluid-solid coupling algorithm in LS-DYNA program. The influences of the barrel's length on the flyer's velocity and integrity were studied and the relationship between the micro-charge size and the flyer's velocity were discussed. Our research results indicate that the barrel's length has a major impact on the flyer's velocity and integrity. It is found that, when it is accelerated in a long barrel, the flyer is likely to be more fragile and cannot achieve maximal driving velocity. The size of the micro-charge is uniquely related with the flyer's velocity in that the flyer's maximum velocity is significantly affected by the charge's diameter. With the increase of the thickness of the charge, the average velocity and the maximal velocity were raised gradually. When the charge diameter is above 0.8 mm, its influence on the flyer's maximal velocity is not remarkable.
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Key words:
- mechanics of explosion /
- MEMS fuze /
- fluid-structure interaction /
- LS-DYNA /
- copper azide /
- titanium flyer
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2(a) t=0.02 μs时叠氮化铜驱动飞片的压力分布
2(a). Pressure distribution of flyer driven by Cu(N3)2 at t=0.02 μs
2(b) t=0.06 μs时叠氮化铜驱动飞片的压力分布
2(b). Pressure distribution of flyer driven by Cu(N3)2 at t=0.06 μs
2(c) t=0.11 μs时叠氮化铜驱动飞片的压力分布
2(c). Pressure distribution of flyer driven by Cu(N3)2 t=0.11 μs
2(d) t=0.20 μs时叠氮化铜驱动飞片的压力分布
2(d). Pressure distribution of flyer driven by Cu(N3)2 t=0.20 μs
2(e) t=0.32 μs时叠氮化铜驱动飞片的压力分布
2(e). Pressure distribution of flyer driven by Cu(N3)2 t=0.32 μs
2(f) t=0.38 μs时叠氮化铜驱动飞片的压力分布
2(f). Pressure distribution of flyer driven by Cu(N3)2 t=0.38 μs
图 4 不同直径装药驱动飞片的速度时程曲线
Figure 4. Velocity histories of flyer driven by charge with different diameters
图 5 不同厚度装药爆轰驱动飞片的速度时程曲线
Figure 5. Velocity histories of flyer driven by charge with different thicknesses
表 1 钛飞片和聚碳酸酯的材料模型参数
Table 1. Parameters of titanium and polycarbonate
材料 ρ/(g·cm-3) E0/GPa G/GPa K/GPa ν 钛 4.51 113.76 43.755 94.803 0.30 聚碳酸酯 1.19 2.34 0.849 3.256 0.38 
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