Magnetohydrodynamics of Metallic Foil Electrical Explosion and Magnetically Driven Quasi-Isentropic Compression

Abstract

Hydrodynamics -Advanced Topics 348 compression was firstly presented by J.R. Asay at Sandia National Laboratory [10] . In last decade, this planar loading technique had being developed fastly and accepted by many researchers in the world, such as France [11] , United Kingdom [12] ,and China [13] . As J.R. Asay said, it will be a new experimental technique widely used in shock dynamics, astrophysics, high energy density physics, material science and so on. The process of magnetically driven quasi-isentropic compression is typical magnetodynamics [14] , which refers to dynamic compression, magnetic field diffusion, heat conduction and so on. As described above, the electrical explosion of metallic foil and magnetically driven quasiisentropic compression is typically magnetohydrodynamic problem. Although it develops fastly and maybe many difficulties and problems exist in our work, we present our important and summary understanding and results to everyone in experiments and simulations of electrical explosion of metallic foil and magnetically driven quasi-isentropic compression in last decade. In the following discussions, more attentions are paid to the physical process, the experimental techniques and simulation of electrical explosion of metallic foil and magnetically driven quasi-isentropic compression.

Vaporizing foil actuator welding as a competing technology to magnetic pulse welding

“…foil), rapid non-linear changes in physical states take place. As described in Wang et al (2011), these changes can be divided into basically five stages: the heating stage, the melting stage, the heating stage of liquid metal before the vaporizing stage, and the plasma forming stage. Once the actuator is in the gaseous state its resistance is a couple of orders higher than in the initial stage.…”

“…, but the governing differential equations require a numerical solver to specify values for the velocity. A more complex simulation model which takes heat conduction, magnetic pressure, and electrical power into account on the basis of magnetohydrodynamic (MHD) equations is presented and experimentally verified inWang et al (2011). VFAW seems to be a promising alternative to MPW due to the following reasons: Higher flyer velocities can be expected, there are no tool life problems since foils are disposable low-cost actuators, workpieces do not need to be good electrical conductors.…”

A 0-D Electric Gun Model for the Optimization of Flyer Acceleration to Hypervelocities

“…However, the model does not consider the flyer state when calculating the flyer dynamics, making it only accurate when modeling launch of flyers under 0.5 mm thickness. Lack of consideration of the flyer state in Osher's model extends into other electric gun models, preventing simple models from being used to investigate the launch thicker of flyers [5], [12].…”