DYNAMIC COMPACTION OF SAND

Abstract

The dynamic compaction of sand was investigated experimentally and computationally to stresses of 1.8 GPa. Experiments were performed in the partial compaction regime at impact velocities from 0.25 to 0.75 km/s. Multiple velocity interferometry probes were used on the rear surface of a stepped target to obtain an accurate measurement of shock velocity, and impedance matching was used to deduce the shock Hugoniot state. Wave profiles were further examined for estimates of reshock states, and a relationship between stress and rise time of the shock was deduced. Experimental results were used to fit parameters for the P‐α and P‐λ models for porous materials in CTH.