Shock compression behavior of low density powder materials and the double-shock Hugoniot

Particle velocity measurements of window/sample interface by velocity interferometer have been performed on a low density powder material, Ce:YAG, under various shock loading conditions generated by plate impact with a maximum impact velocity of 1.564 km/s (SUS304). The observed interface velocities and the reshock pressures are very high, indicating that the shock impedance of shock-compressed powder in the first-shock state is much higher than that of the initial powder because the density and the shock velocity for the first-shock state are largely increased. Measurements with three different window materials with almost the same impact velocities have been carried out to determine the reshock (double-shock) Hugoniot which is much stiffer than the principle Hugoniot, leading to a characteristic shock reverberation behavior of low density powder materials.