Behaviour of rippled shocks from ablatively-driven Richtmyer-Meshkov in metals accounting for strength

S. Opie, S. Gautam, E. Fortin, J. Lynch, Pedro Peralta, E. Loomis

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

While numerous continuum material strength and phase transformation models have been proposed to capture their complex dependences on intensive properties and deformation history, few experimental methods are available to validate these models particularly in the large pressure and strain rate regime typical of strong shock and ramp dynamic loading. In the experiments and simulations we present, a rippled shock is created by laser-ablation of a periodic surface perturbation on a metal target. The strength of the shock can be tuned to access phase transitions in metals such as iron or simply to study high-pressure strength in isomorphic materials such as copper. Simulations, with models calibrated and validated to the experiments, show that the evolution of the amplitude of imprinted perturbations on the back surface by the rippled shock is strongly affected by strength and phase transformation kinetics. Increased strength has a smoothing effect on the perturbed shock front profile resulting in smaller perturbations on the free surface. In iron, faster phase transformations kinetics had a similar effect as increased strength, leading to smoother pressure contours inside the samples and smaller amplitudes of free surface perturbations in our simulations.

Original languageEnglish (US)
Article number012075
JournalJournal of Physics: Conference Series
Volume717
Issue number1
DOIs
StatePublished - May 26 2016

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shock
phase transformations
perturbation
metals
iron
simulation
shock fronts
kinetics
ramps
smoothing
laser ablation
strain rate
histories
mechanical properties
continuums
copper
profiles

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Behaviour of rippled shocks from ablatively-driven Richtmyer-Meshkov in metals accounting for strength. / Opie, S.; Gautam, S.; Fortin, E.; Lynch, J.; Peralta, Pedro; Loomis, E.

In: Journal of Physics: Conference Series, Vol. 717, No. 1, 012075, 26.05.2016.

Research output: Contribution to journalArticle

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