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Khishchenko, K. V.; Ткаченко, С. И.; Levashov, P. R.; Ломоносов, И. В.; Воробьев, В. С.

doi:10.1023/a:1019821126883

Cited by 60 publications

(31 citation statements)

References 6 publications

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“…In accordance with [13], the instant of time at which this temperature will be reached is t ≈ 6.2 μs, which coincides with the beginning of intensive expansion of wire recorded experimentally and shown by arrow in Fig. 3.…”

Section: Formation Of Droplets Of Critical Sizesupporting

confidence: 87%

“…Because of the exponential dependence of τ on temperature, some threshold value of τ exists at which the time of expectation for the appearance of criticalradius nucleus is comparable with the characteristic time of the process (for the mode of wire heating described in [13], this characteristic time amounts to tenths of a microsecond). We will compare this quantity with the time during which droplets of critical size a c may arise in a layer of thickness R r in the vicinity of the liquid conductor-vapor interface (V l = 2πRlR r is the volume of this layer, and l is the conductor length).…”

Section: Formation Of Droplets Of Critical Sizementioning

confidence: 99%

“…In so doing, it turned out that, in experiments with both high-melting and low-melting metals, the range of variation of parameter ξ is quite narrow and lies in the range from 32 to 41. (1, 2) calculated curves of current and voltage [13], (3,4) experimentally obtained values of current and voltage [14].…”

Section: The Region Of the Most Likely Nucleation In The Phase Diagrammentioning

confidence: 99%

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Nucleation Mechanism of Explosive Destruction of Conductors of High Energy Density

2005

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The paper deals with the nucleation mechanism of the loss of thermodynamic equilibrium in systems of high energy density, namely, in current-carrying conductors and in cathode micropoints. The limiting value of energy is discussed which may be introduced into a current-carrying conductor prior to its explosion, as well as the characteristic sizes of droplets during subsequent dispersion, times of delay of micropoint explosions, and other effects accompanying such a mechanism of destruction.

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Section: Formation Of Droplets Of Critical Sizesupporting

confidence: 87%

Section: Formation Of Droplets Of Critical Sizementioning

confidence: 99%

Section: The Region Of the Most Likely Nucleation In The Phase Diagrammentioning

confidence: 99%

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Nucleation Mechanism of Explosive Destruction of Conductors of High Energy Density

2005

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“…Thus, the one-temperature one-dimensional (1-D) magneto-hydrodynamic (MHD) model [16] can describe the initial stage of a wire explosion. Assuming that spatial disturbances of the wire form are small, we can write the set of equations for simulating the resistive stage of the wire heating in Lagrangian form,…”

Section: Modelingmentioning

confidence: 99%

Homogeneity in a Metal Wire under Melting

2005

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Results of numerical simulations of the melting wave in a tungsten wire heated by a high-power nanosecond current pulse are presented. To take into account the hydrodynamic effects under melting, a semiempirical multiphase equation of state for tungsten is used. The structure of the melting wave at different parameters of the heating is studied, and a theoretical evaluation for the thickness of this wave, δ m , is proposed. The homogeneity of the distribution of parameters over the wire can be expected in the case of δ m a 0 , where a 0 is the initial radius of the wire. The melting wave can be considered as a discontinuity of thermophysical properties of the solid and liquid phases at δ m a 0 .

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“…An intensive energy release brings matter into an extreme state with high values of pressure and temperature. Leaving the extreme state is accompanied by a number of dynamic processes including propagation of compression and tension waves [1,3,6], fracture in the solid state [6] due to generation and growth of voids, melting and fracture in the molten state [7][8][9][10] due to cavitation, evolution of the two-phase medium consisting of liquid and vapor, and melt fragmentation to liquid droplets [11]. In the present study, we consider the evolution of the molten state of metal, in particular, the processes of cavitation, evaporation and fracture in the molten state.…”

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confidence: 99%

2D simulations of the dynamics and fracture of metals in the energy absorption zone of the high-current electron beam

Mayer

2015

J. Phys.: Conf. Ser.

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Abstract. The metal behavior under the action of high-current electron irradiation is an example of a complex problem with a large number of involved physical processes. In this paper, we develop a continuum model of dynamic fracture of a metal melt in the energy absorption zone of a high-current electron beam and present a two-dimensional version of this model. The 2D model is necessary for the description of the action of a narrow-focused electron beam on matter. Fracture of copper and aluminum in the molten state in the energy absorption zone of the electron beam is numerically simulated, and the spatial distribution of the droplet size is investigated. Action of a high-current electron beam with the electron energy of about 1 MeV leads to the formation and subsequent breakup of the melt to droplets with diameters from 0.5 µm to several tens of micrometers. The finest droplets (0.5-5 µm) are generated in the center of the energy absorption zone, while the droplet sizes increase up to several tens of micrometer at the edge of the energy absorption zone, where matter is colder. Keeping the melt in a metastable (expanded and overheated) state provides a tension wave with an amplitude of about 3-4 GPa following the shock wave and propagating deep into the target.

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Cited by 60 publications

References 6 publications

Nucleation Mechanism of Explosive Destruction of Conductors of High Energy Density

Nucleation Mechanism of Explosive Destruction of Conductors of High Energy Density

Homogeneity in a Metal Wire under Melting

2D simulations of the dynamics and fracture of metals in the energy absorption zone of the high-current electron beam

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