EXPERIMENTAL TESTS OF VANADIUM STRENGTH MODELS AT HIGH PRESSURES AND STRAIN RATES

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Experimental results showing significant reductions from classical in the Rayleigh-Taylor (RT) instability growth rate due to high pressure material strength or effective lattice viscosity in metal foils are presented. On the Omega Laser in the Laboratory for Laser Energetics, University of Rochester, target samples of polycrystalline vanadium are compressed and accelerated quasi-isentropically at {approx}1 Mbar pressures, while maintaining the samples in the solid-state. Comparison of the results with constitutive models for solid state strength under these conditions show that the measured RT growth is substantially lower than predictions using existing models that work well at low pressures and long time ... continued below

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Park, H; Barton, N R; Becker, R C; Bernier, J V; Cavallo, R M; Lorenz, K T et al. March 2, 2010.

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Experimental results showing significant reductions from classical in the Rayleigh-Taylor (RT) instability growth rate due to high pressure material strength or effective lattice viscosity in metal foils are presented. On the Omega Laser in the Laboratory for Laser Energetics, University of Rochester, target samples of polycrystalline vanadium are compressed and accelerated quasi-isentropically at {approx}1 Mbar pressures, while maintaining the samples in the solid-state. Comparison of the results with constitutive models for solid state strength under these conditions show that the measured RT growth is substantially lower than predictions using existing models that work well at low pressures and long time scales. High pressure, high strain rate data can be explained by the enhanced strength due to a phonon drag mechanism, creating a high effective lattice viscosity.

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  • Presented at: 1st TMS-ABM International Materials Congress Conference, Rio de Janeiro, Brazil, Jul 26 - Jul 30, 2010

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  • Report No.: LLNL-PROC-431291
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 992761
  • Archival Resource Key: ark:/67531/metadc1013969

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  • March 2, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 27, 2017, 5:34 p.m.

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Park, H; Barton, N R; Becker, R C; Bernier, J V; Cavallo, R M; Lorenz, K T et al. EXPERIMENTAL TESTS OF VANADIUM STRENGTH MODELS AT HIGH PRESSURES AND STRAIN RATES, article, March 2, 2010; Livermore, California. (https://digital.library.unt.edu/ark:/67531/metadc1013969/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.