Physical model of low-velocity detonation in plasticized HMX

Grebenkin, K. F.; Taranik, M. V.; Tsarenkova, S. K.; Shnitko, A. S.

doi:10.1007/s10573-008-0013-1

Cited by 3 publications

(10 citation statements)

References 7 publications

(9 reference statements)

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“…(1) changes weakly with variations of the initiating pressure within the indicated limits and can be considered as a constant. Indeed, at such pressures, the value of the derivative dE f dp on the shock adiabat of the HE is ≈50 J/(g · GPa) [10]; hence, we have dT EP dp ≈ 1 c EP dE f dp ≈ 50 J/(g · GPa)/1.5 J/(g · K) ≈ 30 K/GPa.…”

Section: Comparison Of Mechanisms Of Detonation Initiation In Tatb Anmentioning

confidence: 86%

“…In contrast to TATB, the macrokinetics of detonation initiation in HMX is basically determined by the factor of the density of hot spots, i.e., by the pressure on the front of the initiating shock wave [10].…”

Section: Discussionmentioning

confidence: 99%

“…The results of the present work can find applications in constructing physically grounded macrokinetic models of detonation of heterogeneous HEs (see, e.g., [10,38]). …”

Section: Discussionmentioning

confidence: 99%

“…This mechanism of formation of hot spots is called the hydrodynamic mechanism [4]. Note that other mechanisms can play the major role at low pressures (≈0.1 GPa), but the density of hot spots being formed is low, and the number of hot spots is insufficient for normal detonation to form (see the discussion and further references in [10]). …”

Section: Formula Of Three Factorsmentioning

confidence: 99%

“…Thus, the velocity of combustion-wave propagation in crystalline HEs under conditions of high pressures can be measured [16] or calculated by various models [13,17,18]; the density of hot spots can be estimated [19] on the basis of experimental information on the concentration and size of pores; the geometric factor can be obtained by solving a model problem [10], which implies that two other factors are constant. Such an approach offers a theoretical possibility of estimating the three basic factors and, hence, the macrokinetics as a whole by calculations based on the fundamental physical laws or on the data of special (non-detonation) experiments.…”

Section: Formula Of Three Factorsmentioning

confidence: 99%

See 4 more Smart Citations

Comparative analysis of physical mechanisms of detonation initiation in HMX and in a low-sensitive explosive (TATB)

Grebenkin

2009

Combust Explos Shock Waves

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Based on the concept of hot spots, the basic physical factors determining the macrokinetics of chemical reactions in heterogeneous crystalline explosives are estimated. The macrokinetics in plasticized TATB is shown to be basically determined by the velocity of combustion propagation from microscopic reaction spots (hot spots), whereas the macrokinetics in plasticized HMX is determined by the density of hot spots.

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Section: Comparison Of Mechanisms Of Detonation Initiation In Tatb Anmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

“…The results of the present work can find applications in constructing physically grounded macrokinetic models of detonation of heterogeneous HEs (see, e.g., [10,38]). …”

Section: Discussionmentioning

confidence: 99%

Section: Formula Of Three Factorsmentioning

confidence: 99%

Section: Formula Of Three Factorsmentioning

confidence: 99%

See 3 more Smart Citations

Comparative analysis of physical mechanisms of detonation initiation in HMX and in a low-sensitive explosive (TATB)

Grebenkin

2009

Combust Explos Shock Waves

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Hot Surfaces in Heterogeneous Explosives Initiated by a Shock Wave

Varfolomeev

Grebenkin

Zherebtsov

et al. 2010

Combust Explos Shock Waves

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A model for the macrokinetics of chemical reactions in detonating heterogeneous explosives is proposed based on the assumption that not only point but also surface microcenters (hot surfaces) are formed under the action of an initiating shock wave. The occurrence of surface hotspots can be cause by a local rise in temperature near microcracks and on grain boundaries. The model is tested by measuring pressure profiles during detonation initiation in a TATB based explosive composition.At present, the hotspot mechanism of shock-wave initiation of detonation in heterogeneous condensed explosives is generally accepted. It assumes that the passage of a head shock wave through heterogeneities in an explosive leads to the formation of microscopic reaction centers -hotspots -and burnout of most of the explosive mass proceeds in spherical waves of layer-by-layer combustion which propagate from the hotspots [1].Specific energy release during combustion of the microcenters (ΔE) should increase with time in proportion to the relative mass of the material at the hotspots in an elementary volume of the reactive heterogeneous explosive mixture and explosion products (EPs). As usual (see, for example, [1]), the macrokinetics of heterogeneous reactions in a detonating explosive is considered with reference to volume elements whose sizes are small compared to the characteristic sizes of the sample in the experiment but much larger than the average distance between the microcenters.In the initial stage where the microcenters are not overlapped, ΔE ∼ (Dt) 3 [2], where D is the velocity of propagation of the combustion wave. The increase in pressure (Δp) due to energy release in the explosive also depends on time as Δp ∼ ΔE ∼ t 3 . However, in experiments with detonation initiation, a linear rather than cubic time dependence of the pressure is observed [3].

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Experimental Investigations on a Layer of HMX Explosive Crystals in Response to Drop-Weight Impact

Huang

2013

Combustion Science and Technology

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Drop-weight experiments are performed on a thin layer of cyclotetramethylene tetranitramine (HMX) explosive crystals. The drop-weight impact machine is equipped with high-speed photographic systems. Experimental results show the effects of drop heights, mass of particles, and distributed density on compaction, deformation, transparency, reaction violence, and burning propagation. The aim is to establish a link between mechanical and thermal responses for a single layer of granular explosives. Minimum input energy and adequate number of particles, as well as sufficient mutual interactions among particles in the granular explosive sample, are necessary prerequisites for hot spot ignition and growth to burning. The course of the response, instead of a simple ''go'' or ''no go'' criterion is emphasized as a critical consideration in ranking material sensitivity.

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Physical model of low-velocity detonation in plasticized HMX

Cited by 3 publications

References 7 publications

Comparative analysis of physical mechanisms of detonation initiation in HMX and in a low-sensitive explosive (TATB)

Comparative analysis of physical mechanisms of detonation initiation in HMX and in a low-sensitive explosive (TATB)

Hot Surfaces in Heterogeneous Explosives Initiated by a Shock Wave

Experimental Investigations on a Layer of HMX Explosive Crystals in Response to Drop-Weight Impact

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