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  • 1995-1999  (6)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Diagnostics of high-power ion beam interaction with composite targets (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2180-2185 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interaction of a high-power proton beam with 10- to 75-μm-thick double layered aluminum targets has been investigated. The experiments were carried out at the Karlsruhe Light Ion Facility using laser Doppler velocimetry with subnanosecond temporal resolution. The results allow us to determine with high accuracy the range of 1.53 MeV protons in the hot aluminum ablation plasma and to reveal the contribution of the thermal conductivity to the state of the target. An analytical model based on an acoustic approximation was established to interpret the ablative acceleration of the target foils during the whole rise time of the accelerator voltage until the maximum ion range is reached. From this model follows that a shock wave is induced into the adjacent material only when the expansion velocity of the ablation zone exactly equals the sound velocity in the target. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361181
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Resistance of zinc crystals to shock deformation and fracture at elevated temperatures (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1676-1680 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Velocity profiles of the free surface of shock-loaded zinc crystals are measured in two different orientations. The test temperature is varied from room temperature to 410 °C. The results of the measurements show that the high-velocity deformation and fracture are athermal processes and that the fracture stresses are influenced by the preceding plastic deformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130633
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  • 4
    Electronic Resource
    Electronic Resource
    Front structure of a weak shock wave in dense composites (1999)
    Springer
    Journal of applied mechanics and technical physics 40 (1999), S. 501-506 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The structure of the compression-pulse front in a heterogeneous energy material with a characteirstic size of granules of 100–300 μm and its inert simulator with a particle size of 3–5 mm is studied experimentally. Shock waves with an amplitude of the order of 0.1GPa were initiated by a 20-g explosive charge. The velocity of the free surface of the samples or the velocity on the boundary with a water window was recorded by a VISAR laser interferometer. It is shown that the variation in the mass rate in an energy material is of oscillating character, which is explained by the heterogeneous structure of the samples. Oscillations were not observed in a finely dispersed simulator. In addition, it is shown that the viscoelastic Maxwell model is suitable for averaging the description of the evolution of the compression pulse in the studied materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02468407
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of the constants of spall-fracture kinetics of materials using experimental data (1997)
    Springer
    Journal of applied mechanics and technical physics 38 (1997), S. 952-960 
    Details
    ISSN: 1573-8620
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467962
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of an inert high-modulus ceramic wall on detonation propagation in solid explosive charges (1995)
    Springer
    Combustion, explosion and shock waves 30 (1995), S. 674-681 
    Details
    ISSN: 1573-8345
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effect of an intert high-modulus ceramic wall on detonation propagation in charges of a solid heterogeneous explosive was investigated experimentally and numerically. Subdetonation pressures occurred at the boundary between the wall and the explosive for the conditions investigated. Here the detonation velocity increased, and the mass velocity and the pressure at the detonation front decreased, which is explained by the indirect effect of an overtaking wave into the unreacted explosive and the chemical reaction zone. Transverse waves, which affect the detonation parameters, propagate perpendicular to the detonation front with a velocity of ∼6 km/sec. The initial decomposition rate of the explosive directly after the compression shock determines the degree of the transverse-wave effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00755836
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