An Assessment of the Performance of the History Variable Reactive Bum Explosive Initiation Model in the CTH Code

Starkenberg, John; Dorsey, Toni M.

doi:10.21236/ada347569

Cited by 9 publications

(4 citation statements)

References 9 publications

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“…No exothermic reactions of the Comp-B were automatically triggered in any of the computations, so no explosive products were generated. A recent study [25] showed good performance of the HVRB model within CTH computations in properly predicting shock initiation of various explosives for flyer plates impacting at velocities that were typically much higher than those used in the current study.…”

Section: Earlier Experimental Workmentioning

confidence: 56%

A Computational Study of Munitions Response to Double Impact and Crushing Impact From a Flyer Plate

Simmers¹,

Lottero²

2000

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Approved for public release; distribution is unlimited. AbstractThis report describes the results of a series of hydrocode computations, each of which modeled a steel flyer plate striking a single munition, either an M2A3 or an M483, in one of two different mounting configurations. One mounting configuration was for the munition to be first struck by the flyer plate and then to subsequently translate and strike a backing plate. The second configuration was to have the munition mounted with a buffer pack in contact on the flyerplate side and be in initial contact with the backing plate on the opposite side. Some of the computations simulated experiments that were previously performed and reported by the U.S. Army Research Laboratory. Those experiments were not instrumented, so only limited data were produced. The primary purpose of the computations was to compute the pressures that may have occurred in the explosive fill to help explain the various exothermic reactions (or lack thereof) that occurred. Several different flyer-plate velocities were simulated in the computations. A brief discussion of parameters that may be related to ignition by shearing is also included.

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Section: Earlier Experimental Workmentioning

confidence: 56%

A Computational Study of Munitions Response to Double Impact and Crushing Impact From a Flyer Plate

Simmers¹,

Lottero²

2000

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“…With these model assumptions, the shock to detonation transition events are set in motion by loading effected with an imposed piston velocity. This approach is often used to analyze the full SDT events on modern computing resources [22,23].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Probabilistic Detonation Threshold via Millimeter‐Scale Microstructure‐Explicit and Void‐Explicit Simulations

Miller

Kittell

Yarrington

et al. 2019

Propellants Explo Pyrotec

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We present an approach and relevant models for predicting the probabilistic shock‐to‐detonation transition (SDT) behavior and Pop plot (PP) of heterogeneous energetic materials (HEM) via mesoscopic microstructure‐explicit (ME) and void explicit (VE) simulations at the millimeter (mm) sample size scale. Although the framework here is general, the particular material considered in this paper is pressed Octahydro‐1,3,5,7‐tetranitro‐1,2,3,5‐tetrazocine (HMX). To systematically delineate the effects of material heterogeneities, four material cases are considered. These cases are homogeneous material, material with granular microstructure but no voids, homogeneous material with voids, and material with both granular microstructure and voids. Statistically equivalent microstructure sample sets (SEMSS) are generated and used. Eulerian hydrocode simulations explicitly resolve the material heterogeneities, voids, and the coupled mechanical‐thermal‐chemical processes. In particular, it is found that both microstructure and voids strongly influence the SDT behavior and PP. The effects of different combinations of microstructure heterogeneity and voids on the SDT process and PP are quantified and rank‐ordered. The overall framework uses the Mie–Grüneisen equation of state and a history variable reactive burn model (HVRB). A novel probabilistic representation for quantifying the PP is developed, allowing the calculation of (1) the probability of observing SDT at a given combination of shock pressure and run distance, (2) the run‐distance to detonation under a given combination of shock pressure and prescribed probability, and (3) the shock pressure required for achieving SDT at a given run distance with a prescribed probability. The results are in agreement with general trends in experimental data in the literature.

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“…Generally, the reactive hot spots in PBX have the temporal and spatial scales on the order of nanosecond and micron, respectively [17,18], and it is suggested that the shock intensity, the material viscosity, and the initial pore's size and shape all have noticeable effect [ [19][20][21][22][23][24]. To quantitatively describe the reactive flow field of the shock initiation and detonation processes in heterogeneous solid explosives, a number of reaction rate models have been proposed over the years, included mainly the empirical macroscopic models [25][26][27][28], the statistical models [29][30][31] and the mesoscopic models [14,15,32,33]. However, these models show lower precision for quantitatively evaluating the influence of both the explosive's component-content and mesostructure on the shock ignition and detonation characteristics of multi-component explosives.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Detonation Growth Characteristics between HMX‐ and TATB‐based PBXs

Bai

Duan

Luo

et al. 2019

Propellants Explo Pyrotec

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This paper offers a new method for calculating the reaction rate based on the pore collapse “hot‐spot” ignition mechanism in multi‐component polymer bonded explosives (PBXs), and proposes a mesoscopic reaction rate model that allows us to predict the shock initiation and detonation behaviors of multi‐component PBXs with any explosive component proportion and explosive particle size. The pressure‐time histories in PBXC03 (87 % HMX, 7 % TATB, and 6 % Viton by weight) and PBXC10 (25 % HMX, 70 % TATB, and 5 % Kel‐F800 by weight) are calculated by using the new mesoscopic reaction rate model, and the numerical results are found to be in good agreement with the experimental data. It is found that the shock initiation and detonation behaviors of PBXC03 with the dominant component of HMX is mainly controlled by the hot‐spot ignition. The subsequent combustion reacts fast once the hot‐spot is ignited and shows an accelerated reaction characteristic. While, with the dominant component of insensitive TATB, the critical initiation pressure of PBXC10 is high enough to make almost saturated reactive hot spots just behind the precursory shock‐wave front, and the shock initiation behavior is basically determined by the combustion reaction, which is characterized by a stable reaction due to the slow combustion‐wave velocity.

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An Assessment of the Performance of the History Variable Reactive Bum Explosive Initiation Model in the CTH Code

Cited by 9 publications

References 9 publications

A Computational Study of Munitions Response to Double Impact and Crushing Impact From a Flyer Plate

A Computational Study of Munitions Response to Double Impact and Crushing Impact From a Flyer Plate

Prediction of Probabilistic Detonation Threshold via Millimeter‐Scale Microstructure‐Explicit and Void‐Explicit Simulations

Comparative Analysis of Detonation Growth Characteristics between HMX‐ and TATB‐based PBXs

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