HMX decomposition kinetics are usually calibrated in the temperature range around 200 °C. This leads to an underestimation of several orders of magnitude of the thermal explosion times during impacts compared to measurements collected in Henson and Smilowitz, in Nonshock initiation of explosives, Shock wave science and technology reference library, 2010. It highlights the incomplete physics used in the single-or multi-stage decomposition kinetics to model the solid-to-gas transformation of HMX. The experimental device proposed in this work allows the observation of sample pressure and size during heating tests and thus allows the phase transition and thermal ex-plosion of the samples to be observed in real time. The Henson and Smilowitz model is revisited by integrating (1) the mechanical resistance of the molecular network to the phase change and (2) a dependence of the vaporization and sublimation rates on the pressure. The latter describes the pressure-dependence on the virtual melting mechanism and consequently on the presence or absence of δ-HMX in the solid and liquid states. Good correlations between the numerical results and data are obtained. The modified model is then extrapolated to the low velocity impact range.
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