DYNAMIC PROPERTIES OF POLYUREA 1000

The shock response of the viscoelastic polymer material polyurea 1000 has been investigated. Sabots carrying Al or Cu metal disks were launched into target assemblies containing the polyurea material. The target consisted of a thin metal disk on the impact side, a 6.5‐mm‐thick polyurea disk, and a thick metal backup disk. 50‐Ω manganin gauges were epoxied between the metal/polymer and polymer/metal interfaces to measure the interface stresses and shock transit time. Measured longitudinal stresses ranged from 6 to 43 kbar. The measured shock velocity‐particle velocity relationship was linear over this stress range. Maximum volume compression was about 30% for the initial shock wave. Several reshock waves were also measured for each experiment.