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.
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 http://commons.erau.edu/db-aerospace-engineering/4