Equation of State data from off-Hugoniot measurements in multiply-shocked liquids

Plate impact techniques were used to determine Equation of State data in liquids. A copper cell was constructed to confine a test liquid and facilitate the ring-up of stress in the sample. Copper flyer plates were impacted against the cell at a range of velocities inducing a number of stress states in the sample, both on- and off- the principal Hugoniot. It was assumed that a Mie-Gr\"{u}neisen form of the Equation of State was applicable. The arrival times and pressures measured at each shocked state allowed a best-fit value of the Gr\"{u}neisen parameter to be determined. The volume-dependence of the Gr\"{u}neisen parameter is also considered.