Calculation on multi-step thermal decomposition of HMX- and TATB-based composite explosive under cook-off conditions

The thermal decomposition of each component in the composite explosive was described by the multi-step chemical kinetics model. A multi-component grid unit calculation method was put forward to calculate the thermal decomposition reaction processes of the HMX and TATB based composite explosives under the cook-off conditions. And the cook-off tests were carried out to measure the temperatures and ignition times of the explosives and verify the accuracies of the calculations. The thermal reaction performances of the composite explosives were analyzed by changing the mass fraction of each component in them. The results show that the exothermic decomposition of the HMX predominates in the thermal decomposition process of the HMX/TATB composite explosive. Moreover, the ignition time and temperature of the composite explosives increase with the increasing of the TATB contents in the composite explosives.