Aluminized highly energetic materials simulation under partial chemical equilibrium assumption with HEMSim

We are pleased to introduce the first version of HEMSim, an advanced computational code for ideal detonation analysis. In this study, we aim to apply this ideal detonation code to a non-ideal explosive formulation, both with and without aluminum. The hard-coded model incorporates a variable percentage of aluminum reaction completion during detonation, reflecting its influence on the predicted detonation parameters. Key outputs include the Chapman-Jouguet (CJ) point and the fitting of the Jones-Wilkins-Lee (JWL) equation of state. The effect of aluminum addition to an emulsion explosive was investigated both numerically and experimentally. A series of cylinder test experiments was conducted using emulsion explosives containing 0% and 15% aluminum powder. The parameters of the JWL equation of state were determined from the experimental results and calculated using HEMSim. The non-ideal nature of the explosive was modeled by varying the content of reactive aluminum. All the JWL parameter sets were then used in hydrodynamic simulations with LS-DYNA to model the experiment. Experimental and simulated wall velocities were compared to validate the JWL parameters.