Thermal explosion of a TATB-based aluminized explosive

摘要

In this work, The TATB/Al explosive formulation (T-Al, 70wt% TATBI25wt% AU5wt% fluorine resin) was produced by an extrusion technique and the thermal explosion behaviours were studied by differential scanning calorimeter, scaled thermal cook-off tests, and ABAQUS finite element analysis. During the heating process, no blast pressure was detected by the gauges. Combustion of the explosive was observed when the temperature was increased to 583K. The reaction degree was determined to be a burning reaction without blast or fragment damage to the surroundings, demonstrating the excellent thermal stability of T-Al. T-AI cylinders of φ60mm× 120mm, and φ100mm x100mm, in the thermal cook-off experiments, showed almost the same runaway temperature, indicating the slight dependence of the critical response temperature (approximately 583K) on the size of the explosive cylinders in our investigated regions, which was quite different from those of the HMX-and RDX-based explosives. Prior to the thermal ignition of the explosive cylinder with size of φ100mmx 100mm, the temperatures were 584K. 544K, and 531K for the surface, 112 radius, and the center of the explosive, respectively. The simulated temperature profiles by ABAQUS finite element analysis was close to the measured values. The thermal ignition of T-Al occurred at the edge of the cylinder according to the experimental and numerical simulations. The critical thermal runaway temperature for T-Al was calculated based on the Semenov's thermal explosion theory and the thermal decomposition kinetic parameters of the explosive, which was consistent with the experimental value, demonstrating the reliable pre-evaluation of the thermal response of the TATB-based aluminized explosive.