Electric Explosion Early Process Analysis of Metal Bridge Foil Based on an Electromagnetic-Thermal-Mechanical Model
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摘要: 金属桥箔的电爆炸过程对电炮、冲击片雷管等的性能影响极为关键。这一过程中物质性质变化、几何构型和动力学过程非常复杂，早期的大量理论模拟工作均采用极为简化的物理模型。为此，建立了描述爆炸箔早期行为的三维电磁-热-固体力学耦合求解全物理模型，模拟爆炸箔在大电流加载下的早期受热膨胀过程，并对早期膨胀过程中桥箔上的磁场、电流、温度等演化进行分析，观察到电流在构型和电阻率两种因素影响下的角扩散和线扩散现象，模拟得到的桥区温度场分布与参考文献中的实验图像及模拟结果定性符合。Abstract: The electrical explosion of metal bridge foil is a key physical process in many fields, e.g. electric guns and slapper detonator. Due to the complexity of material properties, dynamic processes, and effects of geometric configurations, a large amount of earlier theoretical simulations used simplified physical models. In this paper, a three-dimensional electromagnetic-thermal-mechanical model was established. which was a full physical model describing the early behavior of explosive foil. The early thermal expansion process of the explosive foil under large current loading was simulated, and the evolution of magnetic field, current, temperature, expansion speed of the foil was analyzed. The phenomena of angular and linear current diffusions induced by the configuration and the resistivity were observed in the simulation. The temperature distribution in the bridge region obtained from the simulation is qualitatively consistent with experiment and simulation results of literature.
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Key words:
- explosive foil /
- slapper detonator /
- magnetic fluid /
- multi-field coupling
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图 4 爆炸箔几何1/2模型示意图（单位：mm）
Figure 4. Schematic diagram of the 1/2 model of explosion foil (Unit: mm)
图 6 表面磁场强度分布
Figure 6. Magnetic field intensity distribution of upper and lower surfaces
图 11 不同时刻的磁场强度分布
Figure 11. Magnetic field intensity distribution at different instants
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