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Vlasov Y.V.,Institute of Experimental Physics VNIIEF
Journal of Applied Mechanics and Technical Physics | Year: 2015

The MEG-2D two-dimensional Eulerian design procedure was used for magnetohydrodynamic simulation of the megaampere current switching process by an explosive opening switch. This paper presents simulation results for the current switching of a helical magnetocumulative generator (MCG) by explosive opening switches of different types at the same parameters of the switching scheme, thickness of the breaking conductor made of copper foil, the breaking current, and the number of opening switch elements. Simulation results for current switching by an explosive opening switch with a ribbed barrier for different thickness of the broken copper foil conductor are also presented. In the case of using a foil 0.3 mm thick, a ribbed barrier with steel inserts on the ribs with optimal parameters was investigated. It is shown that at a foil thickness less than 0.2 mm, decreasing the depth of the groove in the barrier does not lead to an increases in the time of triggering of the opening switch. © 2015, Pleiades Publishing, Ltd.


Buyko A.M.,Institute of Experimental Physics VNIIEF
Journal of Applied Mechanics and Technical Physics | Year: 2015

This paper presents a review of publications on the use of electrically exploded foil opening switches to form current pulses up to 100 MA (up to 45 MA in experiments) with a rise time of 0.1–10.0 µs. Physical schemes and models are considered, and the efficiency of foil opening switches for existing and advanced facilities is analyzed. © 2015, Pleiades Publishing, Ltd.


Garanin S.G.,Institute of Experimental Physics VNIIEF | Ivanovsky A.V.,Institute of Experimental Physics VNIIEF
Journal of Applied Mechanics and Technical Physics | Year: 2015

A device based on a super-power disk explosive magnetic generator for producing an x-ray pulse with energy exceeding the target ignition threshold is presented and substantiated. © 2015, Pleiades Publishing, Ltd.


Garanin S.F.,Institute of Experimental Physics VNIIEF | Kuznetsov S.D.,Institute of Experimental Physics VNIIEF | Reinovsky R.E.,Los Alamos National Laboratory
Journal of Applied Mechanics and Technical Physics | Year: 2015

This paper investigates the feasibility of using the PHELIX facility for generation of warm dense matter (WDM), i.e., substance at densities of the order of 0.01–1.00 of the solid matter density and a temperature of 1–10 eV, by electric explosion of a thin cylindrical metal foil enclosed in an insulator. It has been shown this system can be used to produce a significant volume of uniform WDM with a density of 0.1–1.0 g/cm3 and a temperature of 3–4 eV, sufficient for electrical measurements. A method of determining WDM parameters based on electrical measurements and foil boundary velocimetry is described. © 2015, Pleiades Publishing, Ltd.


Bazhenov V.G.,Lobachevsky State University of Nizhni Novgorod | Varavin D.A.,Institute of Experimental Physics VNIIEF | Kibets A.I.,Lobachevsky State University of Nizhni Novgorod | Ryabov A.A.,Institute of Experimental Physics VNIIEF | Romanov V.I.,Institute of Experimental Physics VNIIEF
Journal of Applied Mechanics and Technical Physics | Year: 2015

An axisymmetric problem of high strains in a spherical lead shell enclosed into an aluminum “spacesuit” under the action of pulsed loading is considered. The shell straining is described with the use of equations of mechanics of elastoviscoplastic media in Lagrangian variables, and the kinematic relations are determined in the current state metrics. Equations of state are taken in the form of equations of the flow theory with isotropic hardening. The problem is solved numerically by using the variational difference method and the “cross” explicit scheme of integration with respect to time. The influence of the yield stress as a function of the strain rate on changes in the shell shape is studied for different values of loading. The calculated final shape and residual strains are demonstrated to be in good agreement with experimental data. © 2015, Pleiades Publishing, Ltd.

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