Shock Initiation of Nano‐TATB Explosives under Short‐Duration Pulses

Abstract

Because of the potential of nano‐TATB as a charge in slapper detonator, the shock initiation threshold of nano‐TATB explosive was studied over short pulse durations (down to 0.017 μs) and high pressure ranges (up to 17 GPa). The pulses were produced by the impact of thin plastic flyer plates, which were accelerated by electrically exploded metal foils. Nano‐TATB powders with a mean particle size of 60 nm were prepared and pressed into cylindrical sample charges with three densities (1.56, 1.64 and 1.74 g/cm3). The flyer impact velocity data versus charging voltages was measured with different flyer thicknesses. Together with the Hugoniot relationships of flyer and samples, the impact pressures and pulse durations were calculated. By using Langlie method, the threshold pressures for shock initiation were determined. In case of the identical flyer plate, the threshold pressure increases with increasing density. In case of the identical explosive density, the threshold pressure increases as the thickness of the flyer decreases (i. e. the pulse duration decreases) except for the highest tested density. These data are represented well by a constant P2τ initiation criterion for the short, high‐pressure pulses and deviate from the P2τ behavior at lower pressures. Finally, nano‐TATB is proved to be a little more sensitive to short‐duration pulses than superfine TATB, but much more sensitive than production grade TATB.

Atomistic Insight into Thermal Decomposition of 1,3,5‐Triamino‐2,4,6‐trinitrobenzene Nanoparticles According to the ReaxFF Molecular Dynamics Method

“…As the decrease of nanometer size, it is more sensitive to external stimuli such as temperature [32] and short-duration pulses. [33] When the temperature rises from 2000 K to 3000 K, the time of dislocation, translation and dispersion is shorter. It is similar to the experimental results.…”

“…It is similar to the experimental results. [32,33] The molecular motion Figure 2 shows the vibration intensity of the 30 Å nano-TATB system at 2000 K range from 5 ps to 24 ps. The more red areas there are, the more energetic the atoms are.…”

Molecular dynamic insight into octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) and the nano-HMX decomposition mechanism

“…[29][30][31][32][33] It has been proven that nanoHNS (2,2 ′ ,4,4 ′ ,6,6 ′ -hexanitrostilbene) and nanoTATB are more sensitive than production grade explosives under a short duration pulse. 34,35 The shock sensitivities of nano-sized HMX particlecontained samples are obviously lower due to the more regular particle surfaces. The detonation velocities of the nanosized HMX particle-contained samples are higher, which is caused by the larger specic surface area of the nano-sized particles.…”