Wang Guiji, He Jia, Zhao Jianheng, Tan Fuli, Sun Chengwei, Mo Jianjun, Xong Xin, Wu Gang
Institute of Fluid Physics, China Academy of Engineering Physics, P.O. Box 919-113, No. 64, Mianshan Road, Mianyang City, 621900, Sichuan Province, People's Republic of China.
Rev Sci Instrum. 2011 Sep;82(9):095105. doi: 10.1063/1.3633773.
Electrical explosion of metallic foil or wire is widely used to the fields of material science (preparation of nao-meter materials), dynamics of materials, and high energy density physics. In this paper, the techniques of gaining hypervelocity flyer driven by electrical explosion of metallic foil were researched, which are used to study dynamics of materials and hypervelocity impact modeling of space debris. Based on low inductance technologies of pulsed storage energy capacitor, detonator switch and parallel plate transmission lines with solid films insulation, two sets of experimental apparatuses with storage energy of 14.4 kJ and 40 kJ were developed for launching hypervelocity flyer. By means of the diagnostic technologies of velocity interferometer system for any reflectors and fibre-optic pins, the hypervelocity polyester (Mylar) flyers were gained. For the apparatus of 14.4 kJ, flyer of diameter φ6 ~ φ10 mm and thickness of 0.1 ~ 0.2 mm was accelerated to the hypervelocity of 10 ~ 14 km/s. And for the apparatus of 40 kJ, flyer of diameter φ20 ~ 30 mm and thickness of 0.2 mm was launched to the velocity of 5 ~ 8 km/s. The flatness of the flyer is not more than 34 ns for the flyer with diameter of 20 mm, and less than 22 ns for the flyer with diameter of 10 mm. Based on the Lagrange hydrodynamic code, one dimensional simulation was done by introducing database of equation of states, discharging circuit equation and Joule heat equation, and modifying energy equation. The simulation results are well agreed with the experimental results in accelerating processing. The simulation results can provide good advices in designing new experiments and developing new experimental devices. Finally, some experiments of materials dynamics and hypervelocity impact of space debris were done by using the apparatus above. The results show that the apparatus of metallic foil electrically exploding driving hypervelocity flyer is a good and versatile tool for shock dynamics.
金属箔或金属丝的电爆炸在材料科学（纳米材料制备）、材料动力学和高能量密度物理等领域有着广泛应用。本文对利用金属箔电爆炸驱动超高速飞片的技术进行了研究，该技术用于材料动力学研究和空间碎片超高速撞击模拟。基于脉冲储能电容器、雷管开关和带固体薄膜绝缘的平行板传输线的低电感技术，研制了两套储能分别为14.4kJ和40kJ的用于发射超高速飞片的实验装置。借助任意反射体速度干涉仪系统和光纤探针的诊断技术，获得了超高速聚酯（聚酯薄膜）飞片。对于14.4kJ的装置，直径φ6～φ10mm、厚度0.1～0.2mm的飞片被加速到10～14km/s的超高速。对于40kJ的装置，直径φ20～30mm、厚度0.2mm的飞片被加速到5～8km/s的速度。直径为20mm的飞片平整度不超过34ns，直径为10mm的飞片平整度小于22ns。基于拉格朗日流体动力学程序，通过引入状态方程数据库、放电电路方程和焦耳热方程并修正能量方程进行了一维模拟。模拟结果与加速过程中的实验结果吻合良好。模拟结果可为新实验设计和新实验装置开发提供很好的建议。最后，利用上述装置进行了一些材料动力学和空间碎片超高速撞击实验。结果表明，金属箔电爆炸驱动超高速飞片装置是一种用于冲击动力学研究的良好且通用的工具。
