Ejection velocities of impact fragments made of ice-silicate mixture and the attenuation of shock pressure

Abstract

Impact experiments were conducted for ice-silicate mixture to measure ejection velocities of disrupted fragments. The mixture was composed of water ice and serpentine power with the mass ratio of one to one. As a result of the impact disruption with the velocity of 3~4 km/s, the antipodal velocity (V_a) of each sample with the size (L_t) of 15 to 30 mm was measured to show that Va = a Lt^-2.5. This V_a is 2 to 3 times lower than that obtained for water ice at the same impact velocity.