Two-dimensional homogeneous and heterogeneous detonation wave propagation

Mader, Charles L.; Forest, C.A.

doi:10.2172/7267134

Cited by 38 publications

(15 citation statements)

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“…[40][41][42] The materials EOSs used a two-phase EOS for Sn ("ptran" in CTH that simulates the bto c-Sn transition), a Mie-Gr€ uneisen EOS 43,44 for Ta and acetal (we substituted PMMA for acetal in the simulation), and a SESAME lookup table 45 for Ti. The elastic-plastic properties were simulated with a Steinberg-Guinan-Lund viscoplastic model 46,47 for Sn and Ti, and we let the PMMA (acetal) plastically flow.…”

Section: Two Shockwave Physics Toolmentioning

confidence: 99%

Second shock ejecta measurements with an explosively driven two-shockwave drive

Buttler

Oró

Olson

et al. 2014

Journal of Applied Physics

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Section: Two Shockwave Physics Toolmentioning

confidence: 99%

Second shock ejecta measurements with an explosively driven two-shockwave drive

Buttler

Oró

Olson

et al. 2014

Journal of Applied Physics

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“…It has long been known that self-sustaining detonation waves in solid plastic bonded explosives (PBX) formulated with the insensitive high explosive molecule triaminotrinitrobenzene (TATB) exhibit regions of zero or partial chemical reaction in spherically divergent or corner-turning experiments [1]. Recently proton radiography [2] and Fabry-Perot laser interferometry [3] have been applied to diverging detonations in PBX 9502 (95% TATB and 5% Kel-F binder) and LX-17 (92.5% TATB plus 7.5%Kel-F), respectively, to quantify the amount of unreacted explosive left at a corner and to measure the buildup of the detonation wave as it approaches its steady state Chapman-Jouguet (C -J) velocity and pressure.…”

Section: Introductionmentioning

confidence: 99%

Ignition and Growth Modeling of LX‐17 Hockey Puck Experiments

Tarver

2005

Propellants Explo Pyrotec

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Detonating solid plastic bonded explosives (PBX) formulated with the insensitive molecule triaminotrinitrobenzene (TATB) exhibit measurable reaction zone lengths, curved shock fronts, and regions of failing chemical reaction at abrupt changes in the charge geometry. A recent set of "hockey puck" experiments measured the breakout times of diverging detonation waves at ambient temperature LX-17 (92.5% TATB plus 7.5% Kel-F binder) and the breakout times at the lower surfaces of 15 mm thick LX-17 discs placed below the detonator-booster plane. The LX-17 detonation waves in these discs grow outward from the initial wave leaving regions of unreacted or partially reacted TATB in the corners of these charges. This new experimental data is accurately simulated for the first time using the Ignition and Growth reactive flow model for LX-17, which is normalized to detonation reaction zone, failure diameter and diverging detonation data. A pressure-cubed dependence for the main growth of reaction rate yields excellent agreement with experiment, while a pressure-squared rate diverges too quickly and a pressure-quadrupled rate diverges too slowly into the LX-17 below the booster equatorial plane.

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“…Mader and Forest [10] observed in one-dimensional shock initiation experiments, the wedge tests, that the shock trajectories obtained for different input pressures nearly coincided if the origins of the trajectories were shifted corresponding to the transition point. This observation led to the hypothesis concerning the build up to detonation known as the single-curve buildup hypothesis.…”

Section: Forest Fire Modelmentioning

confidence: 96%

“…Among others, Mader and Forest [10] proposed the Forest Fire (FF) rate model that can be calibrated with data obtained from a series of shock initiation experiments called the wedge test [1] for explosives exhibiting sharp shock-to-detonation transition (SDT). The FF rate model may be the first reaction rate model based on a hydrodynamic theory, and its calibration is very systematic.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Shock Initiation of a HNIW‐Based Explosive

Lee

Hwang

et al. 2020

Propellants Explo Pyrotec

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To investigate shock-to-detonation transition (SDT) characteristics of a HNIW-based explosive, a rate law based on the Forest Fire model was calibrated by conducting five wedge tests. In the wedge tests, initial shock pressure at wedge-shaped test explosive charges was varied from 5 to 11 GPa. In each test, the shock trajectory along the wedge-shaped explosive charge was recorded with a streak camera. The streak records showed that sharp SDT occurred in the test explosive. The shock Hugoniot of the test explosive was determined from the free-surface velocity of PMMA attenuators measured with a VISAR instrument and the early shock velocity in the wedges, determined from the shock trajectories. The Pop plot for the test explosive was obtained from run distances to detonation esti-mated based on the shock trajectories. The Forest Fire rate of the test explosive was calibrated from the experimental Hugoniot and the Pop plot. The wedge tests were numerically simulated with the calibrated rate by using a one-dimensional Lagrangian hydrodynamic code. The calculated shock trajectories closely reproduced experimental observations. The rate was further applied to two-dimensional numerical simulations of large-scale gap tests (LSGTs). The estimated critical gap thickness by the LSGT simulations was 43.7 mm, which was in good agreement with experimental data of 46.67 mm. The results of these two types of numerical simulations suggested that the calibrated rate could be used to model most SDT-related applications.

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Two-dimensional homogeneous and heterogeneous detonation wave propagation

Cited by 38 publications

References 0 publications

Second shock ejecta measurements with an explosively driven two-shockwave drive

Second shock ejecta measurements with an explosively driven two-shockwave drive

Ignition and Growth Modeling of LX‐17 Hockey Puck Experiments

Numerical Modelling of Shock Initiation of a HNIW‐Based Explosive

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