With advancements in the 3D printing of explosives, the understanding how the shape of an explosive charge influences the energy expansion and subsequently the focusing of energy is becoming increasingly more important. Theoretically, explosive charges could be printed to focus the energy on targets of interest or to synthesize nanomaterials. The first step to quantifying the energy expansion and shock wave convergences for a 3D printed charge is to examine simple geometries of traditional explosive charges (non-3D printed). Detonation of 15 PETN-based primasheet charges in the spherical, cubic, cylindrical, and tetrahedral configurations have been examined in this study. Qualitative data was collected through the use of high-speed photography to examine the shock wave and fireball; production macroscopically. Quantitative pressure data was collected in the near and far field of the detonation reaction using free-field pressure probes, recording data both normal to charge faces as well as along charge vertices. In the near field, a lower pressure zone is created along charge vertices. In the far field, pressures along these bisecting axes increase as the shock front from adjacent facets intersect. These results shed a new light on the effect an explosive charges shape has on its ability to perform work on its surroundings. This paper will describe the methodology and findings of this study as well as examine the causality and implications of its results on our understanding of the detonation phenomena.
C. E. Johnson et al., "Effect of Explosive Charge Geometry on Shockwave Propagation," Shock Compression of Condensed Matter - 2017: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, AIP Publishing, Dec 2017.
The definitive version is available at https://doi.org/10.1063/1.5044977
20th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter (2017: Jul. 9-14, St. Louis, MO)
Mining and Nuclear Engineering
Geosciences and Geological and Petroleum Engineering
Article - Conference proceedings
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01 Dec 2017