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8216031 
Meetings & Symposia 
Modeling hemispheric detonation experiments in 2 dimensions 
Howard, WM; Fried, LE; Vitello, PA; Druce, RL; Phillips, D; Lee, R; Mudge, S; Ross, A; Roeske, F 
2006 
445-454 
English 
Experiments have been performed with LX-17 (92.5% TATB and 7.5% Kel-F 800 binder) to study scaling of detonation waves using a dimensional scaling in a hemispherical divergent geometry. We model these experiments using arbitrary Lagrange-Eulerian hydrodynamics codes (ALE3D1, ARES), with reactive flow models based on the thermo-chemical code, Cheetah2. The thermo-chemical code Cheetah provides a pressuredependent kinetic rate law, along with an equation of state based on exponential-6 fluid potentials3 for individual detonation product species, calibrated to high pressures (~ few Mbars) and high temperatures (20000K). The parameters for these potentials are fit to a wide variety of experimental data, including shock, compression and sound speed data. For the un-reacted high explosive equation of state we use a modified Murnaghan form4. We model the detonator (including the flyer plate) and initiation system in detail. The detonator is composed of LX-16 (96.0% PETN and 4.0% Vctfe binder), for which we use a program burn model. Steinberg-Guinan models5 and Mechanical Threshold Strength (MTS) models6 are used for the metal components of the detonator. The booster and high explosive are LX-10 (95% HMX and 5% Viton-A binder) and LX-17, respectively. For both the LX-10 and LX-17, we use a pressure dependent rate law, coupled with a chemical equilibrium equation of state based on Cheetah. For LX-17, the kinetic model includes carbon clustering on the nanometer size scale. We find that we can model the experimental results reasonably well. However, we also find that the model results depend on the details of the initiation of the booster by the flyer plate.