Nonequilibrium Heating of Powders Under Shock Loading

Nesterenko, V. F.

doi:10.1007/978-1-4757-3524-6_5

Cited by 4 publications

(4 citation statements)

References 55 publications

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“…Some aspects of the computational results are contrary to the assumptions that are found in many analytical models, but they are consistent with other computational investigations [30][31][32] and experiments with metals, for example, [33].…”

Section: Discussion Of the Shock Compaction Calculationssupporting

confidence: 85%

“…both cases, the average values of the kinetic energy and the internal energy are approximately equal near the left boundary, which shows that the shock has attained its stationary conditions (in the sense of the evolution of its profile). The concept of microkinetic energy [33] was developed as a virtual parameter for dividing the response of a powder to dynamic loading into the quasi-static and dynamic regimes. Experiments and calculations [30] have demonstrated that the profile of the microkinetic energy behind the shock can give a great deal of insight into the material response, for example, the quality of the bond between the particles.…”

Section: Inviscid and Viscous Energy Dissipation Mechanismsmentioning

confidence: 99%

“…The powder calculations are expected to be more sensitive to the differences between mixture theories than the typical problems addressed by multimaterial Eulerian hydrocodes because the powder calculations have an unusually high percentage of multimaterial elements. The viscous and inviscid powder compaction cases were chosen as representative of the quasistatic and dynamic regimes of material response [33]. The different calculations are compared at a common time of 30 ns, which is the time when the shock wave is centred within the computational mesh (figure 8).…”

Section: Sensitivity To the Mixture Theorymentioning

confidence: 99%

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Eulerian finite-element simulations of experimentally acquired HMX microstructures

Benson

Conley

1999

Modelling Simul. Mater. Sci. Eng.

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The failure mechanisms in microstructures are influenced by the geometry of the constituent phases. For the most part, the finite-element analyses of material microstructures have used simplified model microstructures, where, for example, the grain structure is represented by regular polygons; particles in powders, spheres; and fibres in composites and cylinders. This research describes a general method for importing experimentally acquired microstructures into an Eulerian finite-element programme. Calculations of the shock densification of an HMX powder, using this technique, explore the assumptions used to model the thermomechanical response of energetic materials. HMX is an energetic material that is used in a large class of polymer-bonded explosives for conventional munitions.

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Section: Discussion Of the Shock Compaction Calculationssupporting

confidence: 85%

Section: Inviscid and Viscous Energy Dissipation Mechanismsmentioning

confidence: 99%

Section: Sensitivity To the Mixture Theorymentioning

confidence: 99%

See 1 more Smart Citation

Eulerian finite-element simulations of experimentally acquired HMX microstructures

Benson

Conley

1999

Modelling Simul. Mater. Sci. Eng.

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“…Such observations agree with the work of Boslough, 76 Iyer et al, 37 Benson et al 118 and Nesterenko. 119 Based upon the irregularity in simulated pressure profiles and the relative precision of shock velocity measurements, the authors suggest that the latter is a more precise indicator of shock induced reactions. This work does well to approach an upper limit on the influence of shock induced reaction on material response.…”

Section: Computational and Mesoscale Modelling Of Dynamic Compression...mentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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The shock-compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the time-scale of the high-pressure state, or thermochemical reactions in the time-scale of temperature equilibration, or simply the creation of densepacked highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock-induced) and thermochemical (shock-assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next-generation energetic materials. In this paper, the process of shock-compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultra-fast "shock-induced" chemical reactions are discussed. Experimental techniques employing time-resolved diagnostics, and results, that identify the occurrence of shock-induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock-compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.

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Coupled two-dimensional discrete element and multibody dynamic modeling for interaction of the soil and rough shaped rigid bodies

Ding

Liu

2022

Acta Mech. Sin.

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Nonequilibrium Heating of Powders Under Shock Loading

Cited by 4 publications

References 55 publications

Eulerian finite-element simulations of experimentally acquired HMX microstructures

Eulerian finite-element simulations of experimentally acquired HMX microstructures

Shock compression of reactive powder mixtures

Coupled two-dimensional discrete element and multibody dynamic modeling for interaction of the soil and rough shaped rigid bodies

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