SAND2024-01658A:
At Sandia National Laboratories, we are developing the tamped Richtmyer-Meshkov instability (RMI) method as a way of measuring the dynamic strength of materials at extreme pressures (0-100+ GPa), temperatures (ambient-melt), and strain rates (105-107 /s). In this talk, the tamped RMI method is described and applied to three metals: Mo, Au, and Pt. Plate impact experiments are performed at Argonne National Laboratory’s Advanced Photon Source’s Dynamic Compression Sector (DCS), driving a planar shock front through a corrugated sample-liquid tamper interface, forcing the corrugation to significantly deform, potentially inverting in shape. Corrugations range in shape (sinusoidal or hemispherical), scale (wavelength), and aspect ratio. The extent of the deformation is experimentally measured using X-ray phase contrast imaging at the DCS. Numerical simulations are performed using the Eulerian code CTH and calibrated against the experimental radiographs. Material yield strength, Y, as a function of shock pressure, P, strain, ϵ, strain rate, ϵ ̇, and temperature, T, are determined for each impact experiment and presented with model fits.
