Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session F01: Diverging and Converging DetonationRecordings Available
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Chair: Caroline Handley, AWE Room: Anaheim Marriott Platinum 5 |
Monday, July 11, 2022 3:30PM - 3:45PM |
F01.00001: Examination of thermodynamic space for classes of experiments Tariq D Aslam, Larry G Hill A critical examination of thermodynamic states is explored for a variety of high explosive experiments. Understanding the path through thermodynamic space that a high explosive experiences during shock to detonation transition (SDT), detonation propagation and failure are important for understanding the roles of these experiments for reactive flow model calibration. SDT, steady detonation propagation, corner turning (ECOT), multi-shock, isothermal and isentropic compression, shock release and re-shock, GapStick and other experiments will be critiqued with respect to the obtained thermodynamic states attained. The focus of this study is to explore where the reactants equation of state are taken by these experiments. To that end, clearly a complete reactive flow model is needed to faithfully ascertain the dynamics of each experiment. For this exploration, an Arrhenius-Wescott-Stewart-Davis (AWSD) model is utilized for dynamic simulations of the tri-amino-tri-nitro-benzene (TATB) based plastic bonded explosive PBX 9502. |
Monday, July 11, 2022 3:45PM - 4:00PM |
F01.00002: Effect of Prill Size on PBX 9502 Corner Turning Performance Measured by the Los Alamos ECOT Test Larry G Hill, Matthew J Herman, Rosemary S Burritt, Joseph P Lichthardt PBX prills are spongy nuggets a few millimeters in diameter, comprising a nonuniform distribution of HE crystals and binder. When pressed—especially at elevated temperatures at which the binder has softened or melted—one hopes that it will flow to uniformly coat the HE crystals. In reality it does so imperfectly, such that x-ray tomographic scans often look like a collection of prills mashed together. Lore is that the larger the prill, the more nonuniform is the binder distribution. Even if that were not so, the larger the prill the farther binder must flow in order to homogenize. Thus, the degree to which binder homogenizes depends in part on the molding-powder prill size. The degree to which it flows during pressing in turn affects the void distribution within pressed charges, which one suspects will affect shock sensitivity and material strength. In this paper we explore, for three PBX 9502 formulation batches using the same TATB powder lot, how prill size correlates with ECOT-test corner-turning distance. |
Monday, July 11, 2022 4:00PM - 4:15PM |
F01.00003: An Update on the Hedonist Experiment Series Adam C Coleman, Carl E Johnson, John R Gibson, Anna Llobet Megias, Rachel Huber, Christopher L Morris, Alexander Jaegers The proton radiography facility (pRad) at LANL offers unique experimental capabilities, but precludes the usage of large quantities of high explosives. The HEDONIST series was designed to investigate multiple phenomena at pRad including the evolution of shocks through detonation products and overdriven states resulting from multiple shock interactions. We present the hydrocode analysis of a small-scale system (under 30g TNT equivalent) capable of reaching pressures in excess of 1 Mbar. This system utilizes a novel multipoint initiation system to produce four converging detonation waves which converge to produce strongly overdriven states in an acceptor charge. HEDONIST has been designed to present a low areal density to the pRad beam thereby providing ample signal-to-noise ratio to discern shock waves in sample cell materials from other shocks present. The two most recent HEDONIST pRad experiments made use of PBX 9501 and Octol acceptor charges respectively. The results from those experiments and comparisons to hydrocode simulations will be discussed. |
Monday, July 11, 2022 4:15PM - 4:30PM |
F01.00004: Wavefront Acceleration and the (Dn-kappa) Relationship in the Evolution of a Detonation Jin Yao, Lawrence E Fried A detonation propagating across multiple HE regions usually creates a concave shock front due to the different detonation speeds. We will show theoretical and numerical evidence that the effect of front acceleration is necessary to correctly predict the motion of a concave detonation. We derive the initiation-zone of a traveling concave front taking into account acceleration. We demonstrate that in the case of a diverging front, such as in a rate-stick test, the solution of a detonation can be improved by adding the acceleration effect to a (D, κ) relation which is precisely defined as the zero-acceleration contour. In addition, we show that a (D, κ) relation describing a quasi-steady diverging wave has a form consistent with an evolution equation previously proposed for a converging wave in the limit of small acceleration. |
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