Thermal response of spherical explosive charges subjected to external heating

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Abstract
A series of one-dimensional heating experiments was performed with selected high explosives (HEs) in unconfined spherical geometries. The purpose of the program was to observe experimentally the thermal behavior of HE specimens near their ignition temperature and also to examine the accuracy with which the Arrenius kinetics models can simulate the ignition process. All test samples were instrumented with thermocouples and the time-temperature data were recorded on a flexible disk. Comparisons between analytical predictions and test data show that (1) the explosives go through a solid-state induction process before the Arrhenius models describe their behavior effectively, (2) the explosives have a memory of the induction process, and (3) the Arrhenius model can accurately predict the critical temperature but not necessarily the time to ignition.

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