Use of the Richtmyer-Meshkov Instability to Infer Yield Stress at High-Energy Densities

Authors

Guy Dimonte, Los Alamos National Laboratory
G. Terrones, Los Alamos National Laboratory
F. J. Cherne, Los Alamos National Laboratory
T. C. Germann, Los Alamos National LaboratoryFollow
Virginie Dupont, Embry Riddle Aeronautical UniversityFollow
K. Kadau, Los Alamos National Laboratory
W. T. Buttler, Los Alamos National Laboratory
D. M. Oro, Los Alamos National Laboratory
C. Morris, Los Alamos National Laboratory
D. L. Preston, Los Alamos National Laboratory

Document Type

Article

Publication/Presentation Date

12-23-2011

Abstract/Description

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.

Publication Title

Physical Review Letters

Scholarly Commons Citation

Dimonte, G., Terrones, G., Cherne, F. J., Germann, T. C., Dupont, V., Kadau, K., Buttler, W. T., Oro, D. M., Morris, C., & Preston, D. L. (2011). Use of the Richtmyer-Meshkov Instability to Infer Yield Stress at High-Energy Densities. Physical Review Letters, 107(26). Retrieved from https://commons.erau.edu/db-aerospace-engineering/4