Strength and Viscosity Effects on Perturbed Shock Front Stability in Metals

S. Opie, E. Loomis, P. Peralta, T. Shimada, R. P. Johnson

Research output: Contribution to journalArticle

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Abstract

Computational modeling and experimental measurements on metal samples subject to a laser-driven, ablative Richtmyer-Meshkov instability showed differences between viscosity and strength effects. In particular, numerical and analytical solutions, coupled with measurements of fed-through perturbations, generated by perturbed shock fronts onto initially flat surfaces, show promise as a validation method for models of deviatoric response in the postshocked material. Analysis shows that measurements of shock perturbation amplitudes at low sample thickness-to-wavelength ratios are not enough to differentiate between strength and viscosity effects, but that surface displacement data of the fed-through perturbations appears to resolve the ambiguity. Additionally, analytical and numerical results show shock front perturbation evolution dependence on initial perturbation amplitude and wavelength is significantly different in viscous and materials with strength, suggesting simple experimental geometry changes should provide data supporting one model or the other.

LanguageEnglish (US)
Article number195501
JournalPhysical Review Letters
Volume118
Issue number19
DOIs
StatePublished - May 9 2017

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shock fronts
viscosity
perturbation
metals
wavelengths
ambiguity
flat surfaces
shock
geometry
lasers

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Strength and Viscosity Effects on Perturbed Shock Front Stability in Metals. / Opie, S.; Loomis, E.; Peralta, P.; Shimada, T.; Johnson, R. P.

In: Physical Review Letters, Vol. 118, No. 19, 195501, 09.05.2017.

Research output: Contribution to journalArticle

Opie S, Loomis E, Peralta P, Shimada T, Johnson RP. Strength and Viscosity Effects on Perturbed Shock Front Stability in Metals. Physical Review Letters. 2017 May 9;118(19). 195501. Available from, DOI: 10.1103/PhysRevLett.118.195501
Opie, S. ; Loomis, E. ; Peralta, P. ; Shimada, T. ; Johnson, R. P./ Strength and Viscosity Effects on Perturbed Shock Front Stability in Metals. In: Physical Review Letters. 2017 ; Vol. 118, No. 19.
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