Showing papers by "Tariq D. Aslam published in 2023"
TL;DR: In this article , the performance of fluid-filled additive-manufactured HE lattices is evaluated by analysis of detonation velocity and Gurney energy, and the results provide, for the first time since the development of HEs, a method to completely remove the hazard of unplanned detonations during storage and transport.
Abstract: We present our discovery of switchable high explosives (HEs) as a new class of energetic material that cannot detonate unless filled with a fluid. The performance of fluid-filled additive-manufactured HE lattices is herein evaluated by analysis of detonation velocity and Gurney energy. The Gurney energy of the unfilled lattice was 98% lower than that of the equivalent water-filled lattice and changing the fluid mechanical properties allowed tuning of the Gurney energy and detonation velocity by 8.5% and 13.4%, respectively. These results provide, for the first time since the development of HEs, a method to completely remove the hazard of unplanned detonations during storage and transport.
3 citations
TL;DR: In this article , a 73.5wt. octahydro-1,3,5,7-tetranitro-based high explosives ink was used to produce directionally sensitive high explosives (HEs).
Abstract: Recent research has demonstrated that additive manufacturing (AM) can be used to produce directionally sensitive high explosives (HEs), but detonation wave propagation in AM HEs with variable internal structure has not been studied. In this work, samples were printed using a 73 wt. % octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine-based HE ink. Flash x-ray radiography imaging was used to observe density changes in two imaging planes of each sample during detonation, and high-speed imaging was used to calculate the detonation velocity at the HE surface. The detonation front initially appears to fail in internal channel regions of the HE, but late reactions occurred in two samples, which increased the material bulk density by 2.8%, possibly due to shock convergence phenomena. The calculated detonation wave pressure similarly increased, but the accuracy of the results is uncertain because of the deviation of the low bulk density printed samples from the cast charge principal isentrope. This work demonstrates that structure can be effectively utilized to guide detonation wave propagation through HE charges.