A zero-dimensional model, which accounts for the primary chemical and physical decomposition processes that occur during slow cookoff of energetic materials in a reaction-cell experiment, is presented. These processes include a global multiphase decomposition mechanism for HMX motivated by recent STMBMS (simultaneous thermogravimetric modulated beam mass spectrometry) measurements of gases exiting a reaction cell maintained at constant temperature, and phenomenological representations of cracking of the solid material and venting of the intermediate and product gases. After a calibration based on decomposition experiments performed at elevated temperatures, the model may then be used for predictive simulations of slow cookoff in accident scenarios.
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