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

Grebenkin, K. F.

doi:10.1007/s10573-009-0011-y

Cited by 25 publications

(23 citation statements)

References 19 publications

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“…The classical view is that simple wave propagation begins from the ignition point (Son, 2002). Burning may or may not develop into a violent event, depending on the combustion wave propagation velocity, density of hot spots, and geometric factors (Grebenkin, 2009;Grebenkin et al, 2008). The most violent burning occurred at 780 ms when two burning fronts linked up.…”

Section: Hmx Response To Drop-weight Impact 283mentioning

confidence: 99%

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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Section: Hmx Response To Drop-weight Impact 283mentioning

confidence: 99%

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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“…after 5 cycles between room temperature and higher than 200 • C. It is well known that the irreversible growth of TATB-based explosives can degrade their mechanical intensity and explosive efficiency, increase shock sensitivity, and further result in some negative effects on their storage and applications. [8][9][10][11] All the time, the origins and control of the irreversible growth of TATB-based PBX have been attracting many researchers' attention.…”

Section: Introductionmentioning

confidence: 99%

Effects of crystal quality and preferred orientation on the irreversible growth of compact TATB cylindrical explosives

Zhang

et al. 2013

AIP Advances

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Three kinds of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) cylinders compacted with TATB raw materials, recrystallized near-spherical and platy TATB crystals are compared to investigate the effects of crystal quality and preferred orientation on their irreversible growth. The results show that the higher the crystal quality, the lower the irreversible volume growth. The compacted cylinders of raw material TATB, with the poorest crystal quality, possess more irreversible growth than those with recrystallized high quality TATB crystals. Irreversible growth of TATB cylinders are also affected by crystal preferred orientation. With the same crystal quality, crystal preferred orientation leads to anisotropic irreversible dimension growth, but has no effect on the volume expansion of TATB cylinders. By changing the crystal quality and preferred orientation, the deformation problem of TATB-based PBX explosives may be restricted. C 2013 Author(s)

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“…As shown in [5], this approximation is suitable for low-sensitive explosive compositions based on TATB. The combustion-wave velocity is modeled by a exponential function of pressure D ∼ exp(αp) [5]. Naturally, this function is the same for point and surface centers.…”

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confidence: 97%

“…The ignition time of the microcenters is small [5]; therefore, it can be assumed that all microcenters in the given element of the volume are ignited simultaneously. Thus, the energy release due to the growth of hotspots increases as ∼ t 3 , and the energy release due to the growth of hot surfaces increases as ∼ t. Hence, at small times, surface hot spots, which have larger initial combustion surface, should play a dominant role.…”

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

Cited by 25 publications

References 19 publications

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

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

Effects of crystal quality and preferred orientation on the irreversible growth of compact TATB cylindrical explosives

Hot Surfaces in Heterogeneous Explosives Initiated by a Shock Wave

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