Modeling heterogeneous energetic materials at the mesoscale

Baer, M.R.

doi:10.1016/s0040-6031(01)00794-8

Cited by 191 publications

(115 citation statements)

References 18 publications

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“…It is well known that shock-to-detonation transition of heterogeneous energetic materials depends critically on the processes occurring at the crystal level [1]- [7]. The initiation mechanism is due to the formation of hot spots, defined as localized regions of high temperatures in excess of ignition temperatures.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional mesoscale simulations of detonation initiation in energetic materials with density-based kinetics

Jackson

Jost

Zhang

et al. 2018

AIP Conference Proceedings

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Section: Introductionmentioning

confidence: 99%

Three-dimensional mesoscale simulations of detonation initiation in energetic materials with density-based kinetics

Jackson

Jost

Zhang

et al. 2018

AIP Conference Proceedings

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“…The results pointed out that interactions generated by reflected waves from neighboring beads can significantly increase the peak hot-spot temperature when the beads are suitably spaced. Baer [2] studied the mesoscopic processes of consolidation, deformation, and reaction of shocked porous energetic materials using the shock physics code, CTH. Numerical simulations indicate that "hot-spots" are strongly influenced by multiple crystal interactions.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale numerical modeling of plastic bonded explosives under shock loading

Shang

Zhao

et al. 2015

EPJ Web of Conferences

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Abstract. Mesoscale responses of plastic bonded explosives under shock loading are investigated using material point method as implemented in the Uintah Computational Framework. The two-dimensional geometrical model which can approximately reflect the mesoscopic structure of plastic bonded explosives was created based on the Voronoi tessellation. Shock loading for the explosive was performed by a piston moving at a constant velocity. For the purpose of investigating the influence of shock strength on the responses of explosives, two different velocities for the piston were used, 200 m/s and 400 m/s, respectively. The simulation results indicate that under shock loading there forms some stress localizations on the grain boundary of explosive. These stress localizations lead to large plastic deformations, and the plastic strain energy transforms to thermal energy immediately, causing temperature to rise rapidly and form some hot spots on grain boundary areas. The comparison between two different piston velocities shows that with increasing shock strength, the distribution of plastic strain and temperature does not have significant change, but their values increase obviously. Namely, the higher the shock strength is, the higher the hot spot temperature will be.

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“…Existing literature examines the behavior of energetic crystals and polymer-bonded explosives (PBXs) in two general forms: as single crystals with anisotropic material properties, [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] and as heterogeneous collections of energetic grains with isotropic material properties. [23][24][25][26][27] The single crystal simulations have been carried out using both discrete methods (e.g., molecular dynamics (MD) and density functional theory (DFT)) [6][7][8][9][10][11][12][13][14][15][16] and continuum scale methods. [17][18][19][20][21] Analyses utilizing discrete methods have yielded understanding of many of the thermo-mechanical properties of the polymorphs of HMX including crystal structure and lattice parameters, 11 isotherms, 10 elastic constants, 7 viscosity, 6 thermal conductivity, and behavior in compression.…”

Section: Introductionmentioning

confidence: 99%

“…The studies that consider PBXs as collections of heterogeneously distributed particles with isotropic properties are able to capture many of the complex interactions that arise from the mesostructure of the granular composites. 2D and 3D Eulerian simulations like those of Benson 23 and Baer 24 use isotropic material descriptions to analyze the stress and temperature fields generated by shock loading of porous granular HMX. Lagrangian simulations have been carried out to analyze the effect on ignition sensitivity of inter-particle friction (Soulard et al 28 and Panchadhara and Gonthier) 29 and the effects of frictional dissipation along both inter-and intra-granular cracks on hotspot formation (Barua et al).…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermomechanical response of polycrystalline HMX under impact loading through mesoscale simulations

Hardin¹,

Rimoli²,

Zhou³

2014

AIP Advances

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We investigate the response of polycrystalline HMX 3,5,3,5, under impact loading through a 3-dimensional mesoscale model that explicitly accounts for anisotropic elasticity, crystalline plasticity, and heat conduction. This model is used to quantify the variability in temperature and stress fields due to random distributions of the orientations of crystalline grains in HMX under the loading scenarios considered. The simulations carried out concern the response of fully dense HMX polycrystalline ensembles under impact loading at imposed boundary velocities from 50 to 400 m/s. The polycrystalline ensemble studied consists of a geometrically arranged distribution of bi-modally sized and shaped grains. To quantify the effect of crystalline slip, two models with different numbers of available slip systems are used, reflecting differing characterizations of the slip systems of the HMX molecular crystal in the literature. The effects of microstructure and anisotropy on the distribution of heating and stress evolution are investigated. The results obtained indicate that crystalline response anisotropy at the microstructure level plays an important role in influencing both the overall response and the localization of stress and temperature. The overall longitudinal stress is up to 16% higher and the average temperature rise is only half in the material with fewer potential slip systems compared to those in the material with more available slip systems. Local stresses can be as high as twice the average stresses. The results show that crystalline anisotropy induces significant heterogeneities in both mechanical and thermal fields that previously have been neglected in the analyses of the behavior of HMX-based energetic materials. C 2014 Author(s)

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Modeling heterogeneous energetic materials at the mesoscale

Cited by 191 publications

References 18 publications

Three-dimensional mesoscale simulations of detonation initiation in energetic materials with density-based kinetics

Three-dimensional mesoscale simulations of detonation initiation in energetic materials with density-based kinetics

Mesoscale numerical modeling of plastic bonded explosives under shock loading

Analysis of thermomechanical response of polycrystalline HMX under impact loading through mesoscale simulations

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