Institute of Experimental Physics VNIIEF

Sarov, Russia

Institute of Experimental Physics VNIIEF

Sarov, Russia
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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.


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.


Zav'yalov N.V.,Institute of Experimental Physics VNIIEF | Gordeev V.S.,Institute of Experimental Physics VNIIEF | Puchagin S.Y.,Institute of Experimental Physics VNIIEF | Mozgovoi A.L.,Institute of Experimental Physics VNIIEF | And 5 more authors.
Journal of Applied Mechanics and Technical Physics | Year: 2015

This paper presents the results of measurements of the generation parameters of the Gamma-4 electrophysical facility designed to generate high-power bremsstrahlung pulses with a duration of ≈50 ns. Five shots of the Gamma-1 accelerator were performed, in which the bremsstrahlung exposure dose was measured at a distance of 20, 30, and 60 cm from the accelerator target. It is shown that the experimental data correspond to the radiation field of a point cosine source with a relative error of 13%. The spatial distribution of the bremsstrahlung exposure dose of the Gamma-4 facility was reconstructed taking into account the spatial orientation of the irradiators. The bremsstrahlung exposure doses at a distance of 15 cm from the modules targets are presented. © 2015, Pleiades Publishing, Ltd.


Dudai P.V.,Institute of Experimental Physics VNIIEF | Zimenkov A.A.,Institute of Experimental Physics VNIIEF | Ivanov V.A.,Institute of Experimental Physics VNIIEF | Ivanov E.I.,Institute of Experimental Physics VNIIEF | And 4 more authors.
Journal of Applied Mechanics and Technical Physics | Year: 2015

The paper describes a small-size explosive current source with controllable output voltage shaping a megaampere current pulse. This energy source comprises a helical explosive magnetic generator and an explosive sectionalized current opening switch and is designed to power gas-discharge chambers of the plasma focus type. Control of the output voltage of the pulsed current source is performed in such a manner that in each of the series-connected sections of the explosive current opening switch, voltage is generated with a given time shift relative to the neighboring section. © 2015, Pleiades Publishing, Ltd.


Duday P.V.,Institute of Experimental Physics VNIIEF | Zimenkov A.A.,Institute of Experimental Physics VNIIEF | Ivanov V.A.,Institute of Experimental Physics VNIIEF | Kraev A.I.,Institute of Experimental Physics VNIIEF | And 3 more authors.
Journal of Applied Mechanics and Technical Physics | Year: 2015

This paper describes a method and device for generating a mega-ampere quasi-trapezoidal current pulse of given amplitude and duration in a liner load. The experimental device consisting of a current source based on a helical explosive magnetic generator (HEMG) produced a current pulse in the liner load with an amplitude of ≈ 10 MA and controlled duration and current rise and decay times. The use of this source to accelerate cylindrical liners allows the study of the mechanisms of material damage in converging geometry, in which new damage effects may occur due to the multidimensional nature of the loading conditions. © 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.


Nevmerzhitskii N.V.,Institute of Experimental Physics VNIIEF | Razin A.N.,Institute of Experimental Physics VNIIEF | Sen'kovskii E.D.,Institute of Experimental Physics VNIIEF | Sotskov E.A.,Institute of Experimental Physics VNIIEF | And 4 more authors.
Journal of Applied Mechanics and Technical Physics | Year: 2015

This work presents the results of experimental and numerical studies on the process of turbulent mixing ocurring at the contact boundaries of three-layer gas systems during the passage of a stationary shock wave with a Mach number M ≈ 1.3. The experiments are carried out in an air shock tube. The working gases are air, SF6, and He. The flow structure is recorded by a schlieren method with laser illumination. The data on the nature of turbulent mixing in two-dimensional flows are obtained. © 2015, Pleiades Publishing, Ltd.


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.


Demidov V.A.,Institute of Experimental Physics VNIIEF | Kazakov S.A.,Institute of Experimental Physics VNIIEF | Boriskin A.S.,Institute of Experimental Physics VNIIEF | Vlasov Y.V.,Institute of Experimental Physics VNIIEF | And 3 more authors.
Journal of Applied Mechanics and Technical Physics | Year: 2015

Several possibilities of preamplifier energy and power increasing are considered: using a more powerful (HMX-based) conical HE-charge in the central tube of the magneto-cumulative generator, using a magnetic flux finish pressing out device with axial initiation of the HE charge, and increasing the inner diameter of the helix. A magneto-cumulative generator (MCG) with a helix 280 mm in diameter (MCG-280) is developed. The new preamplifier has a power of ≈400 GW and is able to power a ten-element DMCG480 with an initial inductance of ≈0.2 µH by a current of ≈10 MA with a characteristic current rise time (by a factor of e at the final stage of its operation) τe = 32 µs. © 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.

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