Abstract. Simulations of high voltage detonators, such as Exploding Bridgewire (EBW) and Exploding Foil Initiators (EFI), have historically been simple, often empirical, one-dimensional models capable of predicting parameters such as current, voltage, and in the case of EFIs, flyer velocity. Experimental methods have correspondingly generally been limited to the same parameters. With the advent of complex, first principles magnetohydrodynamic codes such as ALEGRA and ALE-MHD, it is now possible to simulate these components in three dimensions, and predict a much greater range of parameters than before. A significant improvement in experimental capability was therefore required to ensure these simulations could be adequately verified. In this third paper of a three part study, the experimental results presented in part 2 are compared against 3-dimensional MHD simulations. This improved experimental capability, along with advanced simulations, offer an opportunity to gain a greater understanding of the processes behind the functioning of EBW and EFI detonators.
Abstract. Several continuum models aim to represent the shock compaction of brittle granular materials but their success is limited by their insensitivity to the effects of meso-scopic features. This investigation is part of early attempts to quantify the effects of particle size on the macro shock response of a granular material. Plate impact experiments were conducted on beds of soda-lime glass microspheres. Three different quasimono-disperse particle size distributions were subjected to shock pressures between 0.6 -4.5 GPa. There is an obvious difference between the compaction behaviour of 63 μm particles compared to beds of 200 and 500 μm particles. A precursor wave is present at low stresses that potentially signifies bulk material strength; the precursor magnitude decreases with increasing particle size.
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