title: Use of the Richtmyer-Meshkov instability to infer yield stress at high-energy densities.
abstract: We use the Richtmyer-Meshkov instability (RMI) at a metal-gas interface to infer the metal's yield stress (Y) under shock loading and release. We first model how Y stabilizes the RMI using hydrodynamics simulations with a perfectly plastic constitutive relation for copper (Cu). The model is then tested with molecular dynamics (MD) of crystalline Cu by comparing the inferred Y from RMI simulations with direct stress-strain calculations, both with MD at the same conditions. Finally, new RMI experiments with solid Cu validate our simulation-based model and infer Y~0.47 GPa for a 36 GPa shock.
authors.affiliation: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Guy
authors.initials: G
authors.lastname: Dimonte
authors.forename: G
authors.initials: G
authors.lastname: Terrones
authors.forename: F J
authors.initials: FJ
authors.lastname: Cherne
authors.forename: T C
authors.initials: TC
authors.lastname: Germann
authors.forename: V
authors.initials: V
authors.lastname: Dupont
authors.forename: K
authors.initials: K
authors.lastname: Kadau
authors.forename: W T
authors.initials: WT
authors.lastname: Buttler
authors.forename: D M
authors.initials: DM
authors.lastname: Oro
authors.forename: C
authors.initials: C
authors.lastname: Morris
authors.forename: D L
authors.initials: DL
authors.lastname: Preston