Bulletin of the American Physical Society
20th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 62, Number 9
Sunday–Friday, July 9–14, 2017; St. Louis, Missouri
Session Y2: Energetic and Reactive Materials: Additive Manufacturing |
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Chair: Alex Tappan, Sandia National Laboratories Room: Grand Ballroom AB |
Friday, July 14, 2017 9:15AM - 9:45AM |
Y2.00001: Dynamic Response Modeling of Materials Structured at the Grain-Scale Invited Speaker: Bradley White Advanced manufacturing methods have given researchers additional control over the creation of complex structures, at the sub-millimeter length scale, for use in inert and energetic material applications. While the dynamic behavior and reactivity in energetic materials are typically dictated by their stochastic microstructures and formulation (particle size, constituents, weight percentages), the added benefits resulting from advanced manufacturing techniques are not entirely known. Through modeling we are examining the effects of material architecture on the shock and detonation wave dynamics in energetic materials using modeling at the continuum and grain scales. Wave interactions between different energetic materials and energetic with inert materials are of interest, as well as length scale dependencies due to local architecture and composition. This work will give insight into correlating mixing and behavior at the grain-scale level to the continuum level response. This work was performed under the auspices of the United States Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. [Preview Abstract] |
Friday, July 14, 2017 9:45AM - 10:00AM |
Y2.00002: Controlled Detonation Dynamics in Additively Manufactured High Explosives Andrew Schmalzer, Bryce Tappan, Patrick Bowden, Virginia Manner, Brad Clements, Ralph Menikoff, Axinte Ionita, Brittany Branch, Dana Dattelbaum, Michelle Espy, Brian Patterson, Ruilian Wu, Alexander Mueller The effect of structure in explosives has long been a subject of interest to explosives engineers and scientists. Through structure, detonation dynamics in explosives can be manipulated, introducing a new level of safety and directed performance into these previously difficult to control materials. New advances in additive manufacturing (AM) allow the deliberate introduction of exact internal structures at dimensions approaching the mesoscale of these energetic materials. We show through simulation and experiment that this structure can be used to control detonation behavior by manipulating complex shockwave interactions. We use high-speed video and shorting mag-wires to determine the detonation velocity in AM generated explosive structures, demonstrating, for the first time, a method of controlling the directional propagation of reactive flow through the controlled introduction of structure within a high explosive. With ongoing improvement in the AM methods available coupled with guidance through modeling and simulations, more complex interactions are being explored. [Preview Abstract] |
Friday, July 14, 2017 10:00AM - 10:15AM |
Y2.00003: Simulations of multi-component explosives using simplified geometric arrangements of their constituents George Butler, Steven Pemberton Modeling and simulation is extremely important in the design and formulation of new explosives and explosive devices due to the high cost of experiment-based development. However, the efficacy of simulations depends on the accuracy of the equations of state (EOS) and reactive burn models used to characterize the energetic materials. We investigate the possibility of using the components of an explosive fill as discrete elements in a simulation, based on the relative amounts of the constituents. This is accomplished by assembling a mosaic, or ``checkerboard'', in which each cell comprises the relative amounts of the constituents as in the mixture; it is assumed that each constituent has a well-defined set of simulation parameters. We do not consider the underlying microstructure, and recognize there will be limitations to the usefulness of this technique. We are interested in determining whether there are applications for this technique that might prove useful. As a test of the concept, two binary explosives were considered. We considered shapes for a periodic cellular structure and compared results from the checkerboards with those of the baseline explosives; detonation rates, cylinder expansion, and gap test predictions were compared. [Preview Abstract] |
Friday, July 14, 2017 10:15AM - 10:30AM |
Y2.00004: Experimental Study of Structure/Behavior Relationship for a Metallized Explosive. Eric Bukovsky, Robert Reeves, Alexander Gash, Nick Glumac Metal powders are commonly added to explosive formulations to modify the blast behavior. Although detonation velocity is typically reduced compared to the neat explosive, the metal provides other benefits. Aluminum is a common additive to increase the overall energy output and high-density metals can be useful for enhancing momentum transfer to a target. Typically, metal powder is homogeneously distributed throughout the material; in this study, controlled distributions of metal powder in explosive formulations were investigated. The powder structures were printed using powder bed printing and the porous structures were filled with explosives to create bulk explosive composites. In all cases, the overall ratio between metal and explosive was maintained, but the powder distribution was varied. Samples utilizing uniform distributions to represent typical materials, discrete pockets of metal powder, and controlled, graded powder distributions were created. Detonation experiments were performed to evaluate the influence of metal powder design on the output pressure/time and the overall impulse. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. [Preview Abstract] |
Friday, July 14, 2017 10:30AM - 10:45AM |
Y2.00005: ABSTRACT WITHDRAWN |
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