Equation of state of detonation product gases

Lee, E.L.; Hornig, H.C.

doi:10.1016/s0082-0784(69)80431-5

Cited by 34 publications

(7 citation statements)

References 5 publications

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“…Researchers determined these coefficients with the experimental C-J conditions, calorimetric data, and cylinder test data. 30–32 The JWL parameters, initial density ( ρ 0 ), detonation energy density ( E m ), and detonation velocity ( D ) in Table 1 were given as input to the FEM.…”

Section: Simulation Methodologymentioning

confidence: 99%

Investigation of the explosive type on the high strain forming of OFHC copper tube

Yildiz

2021

The Journal of Strain Analysis for Engineering Design

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The paper computationally investigates the explosive forming of the oxygen-free high thermal conductivity (OFHC) copper tube subjected to five different explosives. To investigate the effect of explosive type on the formability of OFHC copper tube, commonly used explosives, including C-4, TNT, HMX, Comp-B, and PBXN, was compared by using the finite element method. To verify the developed finite element model (FEM), the explosive forming experiments were carried out by using C-4. In the simulations, Coupled-Eulerian-Lagrangian (CEL) method to model the large deformations, Jones-Wilkins-Lee (JWL) equations of state (EOS) to define the explosive properties and Johnson-Cook (J-C) strength and damage models to specify the metal’s mechanical behavior were utilized. Besides, Hillerborg’s fracture energy was calculated with the Charpy impact test results and given as input to the FEM. The results of FEM were compared and verified using the results of explosive forming tests considering the mesh density and friction coefficient. The simulations revealed that the explosive type affected both the final shape and also the strain rate of the copper tube. When the simulation results for C-4 was taken as reference, HMX and PBX-N increased the strain rate as 110%, roughly. However, Comp-B and TNT reduced the strain rate by nearly 10% and 22%, respectively. Also, the explosive type changed the final hardness of the metal. OFHC Copper had the lowest hardness (112.7 HV) when the simulations were conducted with TNT. In contrast, the highest hardness value (129.5 HV) was reached when HMX was used in the simulations. In addition, simulations put forth that Hillerborg’s fracture energy criteria could be used in the explosive simulations to predict the damage on the metals.

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Section: Simulation Methodologymentioning

confidence: 99%

Investigation of the explosive type on the high strain forming of OFHC copper tube

Yildiz

2021

The Journal of Strain Analysis for Engineering Design

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“…Non-indexed entries correspond to this work whereas index values, Exp. 2-3 91 and Sim. 1 22 and 2 24 , come from the literature.…”

Section: A Detonationmentioning

confidence: 99%

First principles reactive simulation for equation of state prediction

Jadrich,

Ticknor,

Leiding

2021

Preprint

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The high cost of density functional theory has hitherto limited the ab initio prediction of equation of state (EOS). In this article, we employ a combination of large scale computing, advanced simulation techniques, and smart data science strategies to provide an unprecedented, ab initio performance analysis of the high explosive pentaerythritol tetranitrate (PETN). Comparison to both experiment and thermochemical predictions reveals important quantitative limitations of DFT for EOS prediction, and thus the assessment high explosives. In particular, we find DFT predicts the energy of PETN detonation products to be systematically too high relative to the unreacted neat crystalline material, resulting in suppression of the detonation velocity, pressure, and temperature at the Chapman-Jouguet (CJ) state. The energetic bias can be partially accounted for by high level electronic structure calculations of the product molecules. We also demonstrate a modeling strategy for mapping chemical composition across a wide parameter space with limited numerical data, the results of which suggest additional molecular species to consider in thermochemical modeling.

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“…The burned HE (subscript: b) follows a JWL EOS [43][44][45][46][47][48] in so-called "C-form" (i. e. the adiabat):…”

Section: Equation Of Statementioning

confidence: 99%

“…Pyrotech. 2020,45,[1506][1507][1508][1509][1510][1511][1512][1513][1514][1515][1516][1517][1518][1519][1520][1521][1522]…”

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A Simple Reactive‐Flow Model for Corner‐Turning in Insensitive High Explosives, Including Failure and Dead Zones. I. The Model.

Williams

2020

Propellants Explo Pyrotec

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I report on a novel simple reactive-flow model that captures corner-turning behavior, including failure and the creation of dead zones, in insensitive solid heterogeneous high explosives. The model is fast, has a minimum of free parameters, and is physically grounded in the underlying initiation and burn phenomena. The focus of the model is explosives based on triaminotrinitrobenzene (TATB), although the model is quite general. I initially developed the model and integrated it into a branch of a Lawrence Livermore National Laboratory (LLNL) arbitrary Lagrangian-Eulerian (ALE) code concurrently with other modelling efforts of mine, but I subsequently adopted it to study corner-turning behavior in the TATB-based high explosive PBX 9502 when two other available models suggested to me proved inadequate, being either prohibitively computationally expensive or numerically unstable. An early version of the model reproduces corner-turning behavior in two different double-cylinder tests and a mushroomtype corner turning test. The model was informed and influenced by other reactive-flow models applicable to shock initiation or corner-turning, most especially including JWL++ Tarantula 2011 and an in-house piecewise-linear CHEETAH-based model that exhibits corner-turning behavior, but also, to a degree, by Ignition & Growth (I&G), CREST, and the Statistical Hot-Spot Model. The model also shares some similarities to SURF models. In this paper, I describe the model and its theoretical development as I originally conceived it, as well as subsequent improvements.

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Equation of state of detonation product gases

Cited by 34 publications

References 5 publications

Investigation of the explosive type on the high strain forming of OFHC copper tube

Investigation of the explosive type on the high strain forming of OFHC copper tube

First principles reactive simulation for equation of state prediction

A Simple Reactive‐Flow Model for Corner‐Turning in Insensitive High Explosives, Including Failure and Dead Zones. I. The Model.

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