Gas Gun Experiments and Numerical Simulations on the HMX Based Explosive PBX 9501 in the Overdriven Regime.

A set of experiments was designed to measure the Hugoniot for the overdriven products equation of state (EOS) of PBX 9501 to extend data from which current EOS models draw. A series of shots was conducted by M-9 using the two-stage gasguns at LANL. The experiments were modeled in FLAG, a Langrangian multiphysics code, using a one-dimensional setup which employed the WSD reactive burn model. A comparison of the modeled results to the experimental data reveals that the model is a good fit to the data in the lower pressure region. However, in the upper pressure region, the WSD results do not represent the data as well as in the lower regions. This is an indication that the model could be modified to more accurately reproduce data in all regions. [ABSTRACT FROM AUTHOR]