Release isentropes of overdriven plastic-bonded explosive PBX-9501

Continuous release isentropes for the plastic-bonded explosive PBX-9501 are obtained from velocity interferometer system for any reflector measurement s at a high-explosive/LiF interface. Forward calculations from a tabular re presentation of the isentropes to the measured u(t) data at the interface a re iterated to yield isentropes that give agreement with the data. Curves f or the isentropes and for the isentropic gamma, gammas=-(partial derivative lnP/partial derivative lnV)(s) are presented. Because isentropes from diff erent overdriven states differ, a crude estimate of the Gruneisen parameter is obtained. An overall representation of the data is achieved with this G runeisen parameter and a single isentrope through the Chapman-Jouguet state . (C) 2000 American Institute of Physics. [S0021-8979(00)04524-2].