Bulletin of the American Physical Society
21st Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 64, Number 8
Sunday–Friday, June 16–21, 2019; Portland, Oregon
Session T1: DSIC: EOS, Sub-Detonation Response, Multi-shock: Models 2 |
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Chair: Leah Tuttle, SNL Room: Grand Ballroom I |
Thursday, June 20, 2019 2:00PM - 2:15PM |
T1.00001: A CREST Model for the RDX/TNT Explosive Composition B Nicholas Whitworth, Caroline Handley The high explosive Composition B (Comp B), which comprises approximately 60{\%} RDX and 40{\%} TNT by weight, is still widely used for a range of applications, and reactive burn models able to simulate its shock initiation and detonation response are required for modelling assessments. CREST is unique among such models in using an entropy-dependent reaction rate to convert the solid unreacted explosive to gaseous detonation products. This paper describes the calibration of a CREST reactive burn model for Comp B. The equations of state are fitted to the available shock Hugoniot, sound speed and overdriven detonation wave data, and are demonstrated to be suitably robust and compatible. The reaction rate has been tuned to fit recent sustained-shock gas-gun data and, owing to a lack of modern data, a detonation size-effect curve dating from the 1950's on a slightly different Comp B variant. This made it necessary to accept a compromise fit to the calibration data, and which is explored further in the paper. The model is then tested against other Comp B data from the literature to assess its ability to predict a wide range of behaviour. CREST now adds to those reactive burn models available for simulating this well-studied explosive. [Preview Abstract] |
Thursday, June 20, 2019 2:15PM - 2:30PM |
T1.00002: Modeling Mach Stem Initiation of 9502 Eric Mas, Larry Hull, Phillip Miller, Erik Moro, Ian Fleming Initiation of insensitive high explosives (IHEs) by shock reflection, shock interactions, and Mach stem formation is a considerable safety concern and a complex challenge for HE reactive burn models. We have designed a Mach stem test where the position, size, pressure, and release of a Mach stem can be carefully prescribed. An in-depth description of the experiment and results are presented at this symposium by P.I. Miller. In this talk we will present results from simulations of the Mach stem experiments using the reactive burn model scaled uniform reactive front (SURF) [1]. We will show that modest changes to the release of the Mach stem qualitatively change the initiation of 9502 as measured during the experiment, and we will present SURF model comparisons to the experimental data including X-ray images, FFC, and chirped fiber Brag gratings. While the SURF parameters used in this work were derived from pop-plot data and single fragment impact experiments, we will show that the agreement with the more complex, Mach stem experiments is quite good.\\ \\$[1]$ R. Menikoff {\&} M. S. Shaw (2012): The SURF model and the curvature effect for PBX 9502, Combustion Theory and Modeling, DOI:10.1080/13647830.2012.713994 [Preview Abstract] |
Thursday, June 20, 2019 2:30PM - 2:45PM |
T1.00003: Reactive Monte Carlo Validation of Thermochemical Equations of State of High Explosives Jeffery Leiding, Christopher Ticknor, Stephen Andrews, Dario Panici, Curtis Peterson LANL has developed a new thermochemical equation of state code called ``Magpie." Magpie uses Ross' soft-sphere perturbation theory to calculate the equations of state of chemical equilibrium mixtures. We will present benchmark atomistic reactive Monte Carlo calculations of the equations of state of high-explosive product mixtures (the exact result given a set of pair potentials) and compare these to results from Magpie. We will study results for several quantities of interest to high explosives, such as the CJ state and overdriven Hugoniot. These results will quantify the errors of the perturbation theory implementation and mixing rules employed in Magpie, as well as test commonly used chemical equilibrium solvers [Preview Abstract] |
Thursday, June 20, 2019 2:45PM - 3:00PM |
T1.00004: Study of Detonation Reaction Zone and Energy Release Characteristics of the Nitrogen-rich Energetic Ionic Salt TKX-50 Kaiyuan Tan, Yong Han, Jiahui Liu, Zhijian Yang, Xiaojun Lu, Fenglei Huang The Nitrogen-rich energetic ionic salt TKX-50 (bishydroxylammonium 5,5'-bis(tetrazolate-1N-oxide)) has been reported to be one of the most promising explosives in recent years and be regarded as a possible replacement for RDX. In this work, a TKX-50-based Polymer-Bonded eXplosive (PBX), PBX-1, containing the TKX-50 and the polymeric bonder fluororesin F2314 with a mass ratio of 95/5 was prepared. The C-J detonation parameters, detonation reaction zone length, Gurney velocity and the parameters of Jones-Wilkins-Lee equation of state for the detonation products of PBX-1 were experimentally obtained. Some detonation parameters of the HMX-based PBX, PBX-2, and the RDX-based PBX, PBX-3, both of which contain the energetic compounds and F2314 with the same mass ratio as PBX-1, were also measured for a comparative analysis. It was shown that the detonation velocity of PBX-1 was higher than that of PBX-2, substantially higher than of PBX-3, however, the acceleration ability of PBX-1 was lower than that of PBX-2, close to of PBX-3. Some possible causes for these results were proposed. [Preview Abstract] |
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