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  • 1995-1999  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of laser driven spallation in tin and zinc using an optical recording velocity interferometer system (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 4242-4248 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the dynamic strength, in tin and zinc, shocked by a high power pulsed laser to tens of kilobars pressures are reported. The strain rates in these experiments are of the order of 107 s−1, higher by two-to-three orders of magnitude than those reached with conventional shock generators like plane impacts or explosives. The free surface velocity time history, which is related to the spallation process, was measured with an optical recording velocity interferometer system. This diagnostic technique is noninterfering and provides a highly accurate continuous measurement in time. The spall strength estimated from the free surface velocity profile was compared with the theoretical upper limit for the spall strength, calculated from a wide range equation of state for metals. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371352
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimal x-ray source development in the spectral range 4–14 A(ring) using a Nd:YAG high power laser (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 5598-5603 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental study was performed to find the optimal conditions for generating a few nanoseconds x-ray pulse source in the wavelength range 4–14 A(ring). X rays were emitted in a high-temperature plasma, which was created as the result of the interaction of a high power laser with a solid target. The experiments were done using 3–15 J, 1–10 ns, 1.06 μm pulses generated with a Nd:YAG laser. The x-ray yield and spectral distributions were studied as a function of the laser energy, temporal pulse width, pulse shape, and target material. For example, for samarium under optimal conditions, about 20% of the laser energy was converted into x rays in the wavelength range 8–12 A(ring). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363571
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Off-axis holography of laser-induced shock wave targets (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 211-212 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Shock waves of the order of hundreds of kilobars are produced in a tin foil 50 μm thick by a Nd:YAG laser system with a wavelength of 1.06 μm, pulse width of 7 ns [full width at half-maximum (FWHM)] and irradiance in the range (1.4–2.4)×1013 W/cm2, focused to a spot of 200 μm. Off-axis holographic measurements of the target, after 0.5 and 1 μs from the shock arrival, are reported. The hologram is produced by backscattering of a pulse, 6.5 ns (FWHM) of green laser light, from the ejected material from the target. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120411
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An increase of the spall strength in aluminum, copper, and Metglas at strain rates larger than 107 s−1 (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 4004-4011 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the dynamic spall strength in aluminum, copper, and Metglas shocked by a high-power laser to hundreds of kilobars pressure are reported. The strain rates in these experiments are of the order of 107 s−1, which cannot be reached in impact experiments. The free-surface velocity behavior associated with spallation is characterized by oscillations caused by the reverberations of the spall layer. An optically recording velocity interferometer system was developed to measure the free-surface velocity time history. This diagnostic method has the advantages of being a noninterfering system and produces a highly accurate continuous measurement in time. The spall strength was calculated from the free-surface velocity as a function of the strain rate. The results show a rapid increase in the spall strength, suggesting that a critical phenomenon occurs at strain rates ∼107 s−1, expressed by the sudden approach to the theoretical value of the spall strength. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367222
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    A new method for studying debris from laser-induced spall in metals (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 5590-5597 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method of measuring the free-surface velocity via soft x-ray shadowgraphy is presented. Using that method, the shock-wave pressure was deduced. In addition, a new method of measuring the Mie scattering of the debris from laser-induced spall in aluminum is also presented. The data have yielded the distribution of the debris radii in the range of 1–7 μm. Furthermore, it was shown that the smaller particles are the faster ones. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146025
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  • 6
    Electronic Resource
    Electronic Resource
    Development of an optically recording velocity interferometer system for laser induced shock waves measurements (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1379-1381 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An optically recording velocity interferometer system, ORVIS, was developed for measurements of the time evolution of the free surface and the particle velocity in laser induced shock waves experiments. This system produces interference fringe shifts which are proportional to the Doppler shift of a laser beam reflected from the moving surface. These fringe shifts are recorded with a high speed electronic streak camera, which has a 70 ps time resolution. Using this method, the free surface velocity was measured with an accuracy better than 5% and the pressure in laser shocked aluminum targets was calculated. Shock waves of order of hundreds of kilobars are produced by a Nd:YAG laser system with a wavelength of 1.06 μm, pulse width of 5 ns (FWHM) and energy in the range (30–50) J, focused to spots diameters in the range (200–1000) μm. The dynamic spall strength reported here for Al is (14.47±1.45) kbar for a strain rate of cursive-epsilon(overdot)∼8×106s−1, consistent with studies performed with other methods. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117587
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Spallation model for the high strain rates range (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 4851-4858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the dynamic spall strength in aluminum and copper shocked by a high power laser to pressures of hundreds of kbars show a rapid increase in the spall strength with the strain rate at values of about 107 s−1. We suggest that this behavior is a result of a change in the spall mechanism. At low strain rates the spall is caused by the motion and coalescence of material's initial flaws. At high strain rates there is not enough time for the flaws to move and the spall is produced by the formation and coalescence of additional cavities where the interatomic forces become dominant. Material under tensile stress is in a metastable condition and cavities of a critical radius are formed in it due to thermal fluctuations. These cavities grow due to the tension. The total volume of the voids grow until the material disintegrates at the spall plane. Simplified calculations based on this model, describing the metal as a viscous liquid, give results in fairly good agreement with the experimental data and predict the increase in spall strength at high strain rates. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368727
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    Paper (German National Licenses)
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