ISSN 2594-5327
65º Congresso ABM — vol. 65, num.65 (2010)
Título
Autoria
DOI
Downloads
Resumo
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 ~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 relatively low pressures (< few kbar) and relatively long time scales (>μsec). High pressure, high strain rate data can be explained by the enhanced strength due to phonon drag on dislocations, creating a high effective lattice viscosity.
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 ~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 relatively low pressures (< few kbar) and relatively long time scales (>μsec). High pressure, high strain rate data can be explained by the enhanced strength due to phonon drag on dislocations, creating a high effective lattice viscosity.
Palavras-chave
instability
.
Como citar
Park, Hye-Sook;
Barton, N.R.;
Becker, R. C.;
Bernier, J. V.;
Cavallo, R. M.;
Lorenz, K.T.;
Pollaine, S. M.;
Remington, B. A.;
Rudd, R. E..
Experimental tests of vanadium strength models at high pressures and strain rates
,
p. 5278-5287.
In: 65º Congresso ABM,
Rio de Janeiro,
2010.
ISSN: 2594-5327
, DOI 10.5151/2594-5327-33937
