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  • 1
    Electronic Resource
    Electronic Resource
    Spall fracture properties of aluminum and magnesium at high temperatures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 8310-8317 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the dynamic tensile strength of aluminum and magnesium have been carried out by investigations of the spall phenomena over a wide range of temperatures, shock-wave intensities, and load durations. Free-surface velocity profiles were recorded with VISAR and used to provide the spall strength measurements. The initial temperature of samples was varied from room temperature to near the melting point. The peak compressive pressure in the shock waves was varied from 5 to 50 GPa for aluminum and from 2 to 10 GPa for magnesium. The load duration was varied by more than one order of magnitude. The free-surface velocity measurements showed a precipitous drop in the spall strength of preheated samples as temperatures approached the melting point. No significant influence of the peak pressure on the spall strength was observed. The strain-rate dependencies of the spall strength could be represented as power functions with a power index of 0.060 for aluminum and 0.072 for magnesium. Unexpectedly large amplitudes for the Hugoniot elastic limit of both aluminum and magnesium were observed at temperatures approaching the melting point. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362542
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  • 2
    Electronic Resource
    Electronic Resource
    Shock-induced transformations of carbyne (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3757-3759 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of the shock wave loading on films of amorphous carbyne was explored. Chemically synthesized films were deposited on copper disks of 1 mm thickness. X-ray and transmission electron microscopy examination of 10 and 150 μm carbyne films recovered after shock loading at pressures of 18, 26, and 36 GPa were carried out. It was detected that 10 μm films partially transformed to carbyne crystals with a size of about 1 μm. Thick films of carbyne transformed to a mixture of an amorphous carbon phase and nanocrystalline cubic diamond. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363327
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  • 3
    Electronic Resource
    Electronic Resource
    Spall strength of molybdenum single crystals (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 7162-7165 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spall strength measurements for commerical grade molybdenum and molybdenum single crystals were made in a wide range of load durations (∼10−9 s – 10−6 s) and intensities (∼5 – 100 GPa). Resistance to fracture of pure single crystals was found to exceed two times the spall strength of polycrystalline molybdenum and to increase with shorter load duration. The value of the shock wave amplitude does not influence the spall strength of single crystals. The largest spall strength obtained under nanosecond load duration amounts to 30% of the ultimate theoretical strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355032
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  • 4
    Electronic Resource
    Electronic Resource
    Spallation of metals under laser irradiation (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4524-4531 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laser-driven shock-wave loading enables the study of ultrahigh strain rates (107 s−1). A damage model for the spallation process has been included in a two-dimensional finite-difference hydrodynamic elastoplastic code using Lagrangian coordinates in order to calculate the laser-induced spall phenomena. The damage was investigated using shock waves induced by a short-pulsed laser in copper and aluminum foils. Laser irradiation intensities were in the range of 1010–1012 W/cm2. The foil thickness was in the 100–600-μm range. The ablation pressure attained on the front surface of targets was a few hundred kilobars. The travelling time of the shock wave through the target was of the order of a few tens of nanoseconds. The spall width was calculated for both Al and Cu materials with different thicknesses of foils and various laser-induced shock-wave intensities. The numerical simulations were compared with previously reported experiments. Good agreement was obtained between experimental and simulation results for the spall pressure and the spall widths. The strain rates of materials under laser-induced shock loading were obtained from the computer code.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349087
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanism of dust-acoustic instability in a direct current glow discharge plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1374-1380 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An observation of low frequency waves spontaneously excited in a dc glow discharge dusty plasma is reported. To analyze possible reasons for the instability observed, a linear dispersion relation which takes into account collisions with neutrals, dust grain charge variations, ion drift, and forces acting on dust particles is derived. Numerical analysis of the dispersion relation shows that the observed instability is the result of dust charge variations in the presence of external charge-dependent forces together with the ion drift effect. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873954
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  • 6
    Electronic Resource
    Electronic Resource
    Shock wave structure in simple liquids (1997)
    Springer
    JETP letters 65 (1997), S. 755-761 
    Details
    ISSN: 1090-6487
    Keywords: 02.70.Ns ; 62.50.+p
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The shock wave structure in a liquid is studied by a molecular dynamics simulation method. The interaction between atoms is described by the Lennard-Jones (6–12) potential. In contrast to earlier works, the simulation is performed in a reference frame tied to the shock wave front. This approach reduces non-physical fluctuations and makes it possible to calculate the distribution functions of the kinetic and potential energy for several cross sections within the shock layer. The profiles of flow variables and their fluctuations are found. The surface tension connected with pressure anisotropy within the shock front is calculated. It is shown that the main contribution to the surface tension coefficient comes from the mean virial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567422
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  • 7
    Electronic Resource
    Electronic Resource
    Anomalous electric conductivity of lithium under quasi-isentropic compression to 60 GPa (0.6 Mbar). Transition into a molecular phase? (1999)
    Springer
    JETP letters 70 (1999), S. 628-632 
    Details
    ISSN: 1090-6487
    Keywords: 62.50.+p ; 72.15.Eb ; 71.20.Dg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electric conductivity of lithium compressed by dynamic methods by a factor of ~3 to 60 GPa pressure is measured. It is shown that the anomalous, by more than an order of magnitude with respect to the value under normal condition, decrease of electric conductivity under the experimental conditions is due primarily to the change in the interatomic distance. The results obtained can be explained on the basis of the hypothesis that a molecular structure is formed in the lithium at high pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568226
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  • 8
    Electronic Resource
    Electronic Resource
    Liquid plasma crystal: Coulomb crystallization of cylindrical macroscopic grains in a gas-discharge plasma (2000)
    Springer
    JETP letters 71 (2000), S. 102-105 
    Details
    ISSN: 1090-6487
    Keywords: 52.25.Zb ; 52.80.Hc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ordered structures formed of 300-μm-long cylindrical nylon grains with diameters of 15 and 7.5 μm are obtained. In contrast to conventional spherical monodisperse grains, which, under certain conditions, form the plasma-dust Coulomb crystal, the cylindrical grains in the plasma acquire a charge of ∼7×105 electrons and form a structure similar to a liquid crystal. The parameter characterizing the nonideality of the dusty component of the plasma attains 106. Grains are suspended in the striation in the horizontal plane and line up in parallel with each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.568290
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  • 9
    Electronic Resource
    Electronic Resource
    Dusty plasma induced by solar radiation under microgravitational conditions: An experiment on board the Mir orbiting space station (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 1087-1097 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamics of the formation of ordered structures of macroparticles charged by photoemission under the action of solar radiation under microgravitational conditions without the use of electrostatic traps to confine the particles is studied experimentally and theoretically. The working conditions needed for the formation of structures of charged macroparticles are chosen as a result of a numerical solution of the problem posed, the particle charges and the interparticle interaction parameter are determined, and the characteristic times specifying the dynamics of the formation of an ordered system of macroparticles are calculated. The behavior of an ensemble of macroparticles under the effect of solar radiation is observed experimentally on board the Mir space station. An analysis and comparison of the results of the experimental and theoretical investigations permit drawing a conclusion regarding the possibility of the existences of extended ordered formations of macroparticles charged by photoemission under microgravitational conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558598
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  • 10
    Electronic Resource
    Electronic Resource
    Dust acoustic waves in a dc glow-discharge plasma (1999)
    Springer
    Journal of experimental and theoretical physics 89 (1999), S. 477-480 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The spontaneous excitation of low-frequency oscillations of the macroparticle density in ordered dust structures levitating in standing striations of a dc glow discharge is discovered. It is concluded on the basis of a simplified linear model of an ideal collisionless plasma that the observed instability is caused by the drift motion of ions relative to the dust, which leads to the excitation of dust acoustic oscillations of the plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.559006
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