Electrical conductivity distributions in detonating low-density explosives – Grain size effect

Ершов, А. П.; Satonkina, N. P.

doi:10.1016/j.combustflame.2009.11.011

Cited by 26 publications

(25 citation statements)

References 10 publications

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“…24 Following the argument of chemoionization, conductivity should be the higher the faster the initial substance decomposes, that is the maximum of conductivity σ max should be close to the detonation front. According to our data for HEs with well defined conductivity peak, σ max is reached at about the half of duration of the zone of increased conductivity, 4,19,22,[25][26][27] i.e., far from the front which contradicts to the relation of the conductivity σ and the intensity of reactions. On the other hand, the number of elementary chemical reactions per unit time increases with the decrease of the duration of the reaction zone, and, according to Hariton's principle, the duration of the reaction zone is proportional to the critical diameter.…”

Section: A Chemoionizationcontrasting

confidence: 57%

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On the mechanism of carbon nanostructures formation at reaction of organic compounds at high pressure and temperature

Satonkina

Медведев

2017

AIP Advances

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Based on the analysis of the data on the behavior of electric conductivity at the detonation of condensed high explosives (HEs) with the composition CHNO and the carbon mass fraction higher than 0.1, the conclusion was made of the presence of long carbon nanostructures. These structures penetrate all the space of reacting HE. The structures are formed already in the chemical peak region, and they evolve along the detonation wave.

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Section: A Chemoionizationcontrasting

confidence: 57%

“…4,19,22,[25][26][27] The behavior of temperature is more complex. Figure 2 shows the temperature in the CJ point for different density of HE.…”

Section: B Relation Between Electric Conductivity and Temperaturementioning

confidence: 99%

On the mechanism of carbon nanostructures formation at reaction of organic compounds at high pressure and temperature

Satonkina

Медведев

2017

AIP Advances

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“…20,21 The reaction time for RDX detonation has been inferred from electrical conductivity measurements to be over ns with the corresponding reaction zone width exceeding lm. [22][23][24] Apart from the overall reaction time, however, little is known about the reaction pathways within ns. Thus, a serious knowledge gap exists on sub-ns reaction dynamics of RDX under high-pressure, hightemperature conditions.…”

mentioning

confidence: 99%

Multistage reaction pathways in detonating high explosives

Liu

Kalia

Nakano

et al. 2014

Applied Physics Letters

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Articles you may be interested inInitial chemical events in shocked octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine: A new initiation decomposition mechanism J. Chem. Phys. 136, 044516 (2012); 10.1063/1.3679384Combining ab initio quantum mechanics with a dipole-field model to describe acid dissociation reactions in water: First-principles free energy and entropy calculations Atomistic mechanisms underlying the reaction time and intermediate reaction products of detonating high explosives far from equilibrium have been elusive. This is because detonation is one of the hardest multiscale physics problems, in which diverse length and time scales play important roles. Here, large spatiotemporal-scale reactive molecular dynamics simulations validated by quantum molecular dynamics simulations reveal a two-stage reaction mechanism during the detonation of cyclotrimethylenetrinitramine crystal. Rapid production of N 2 and H 2 O within $10 ps is followed by delayed production of CO molecules beyond ns. We found that further decomposition towards the final products is inhibited by the formation of large metastable carbon-and oxygen-rich clusters with fractal geometry. In addition, we found distinct unimolecular and intermolecular reaction pathways, respectively, for the rapid N 2 and H 2 O productions. V C 2014 AIP Publishing LLC. [http://dx.

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“…In the first stage, the surface of aluminum powder is usually covered with oxide film (Al 2 O 3 ), which reduces the conductivity of aluminum. Carbon and aluminum are the main conductive medium, and the increase in carbon content leads to the first sharp increase in conductivity [20][21][22]. In the second stage, shock compression causes a high degree of distortions of the aluminum particles that leads to the creation of cracks of the oxide film.…”

Section: Resultsmentioning

confidence: 99%

Effects of Aluminum Particle Size on the Detonation Pressure of TNT/Al

Zhou

Chen

Yuan

et al. 2017

Propellants Explo Pyrotec

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To better understand the influence of the aluminum particle size on the detonation pressure of TNT/Al, electrical conductivity experiment and detonation pressure experiment were performed in this study. Four types of TNT/Al were considered, in which the particle size of aluminum was 50 nm, 100 nm, 1.50 μm, and 9.79 μm, respectively. The combustion process of Al in TNT/Al was detected by electrical conductivity experiment, and the detonation pressures of TNT/Al were measured by using the manganin pressure sensors. According to the experimental results, the Chapman Jouguet (CJ) pressure of the explosive containing nano‐sized aluminum is higher than the explosive containing micron‐sized aluminum powder because of the combustion of nano‐sized aluminum in the detonation reaction zone. In addition, a smaller aluminum particle size in TNT/Al is associated with a slower detonation pressure attenuation. This study gives a clearer picture of how aluminum particle size contributes to detonation pressure on timescales from 0 to 0.82 μs.

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Electrical conductivity distributions in detonating low-density explosives – Grain size effect

Cited by 26 publications

References 10 publications

On the mechanism of carbon nanostructures formation at reaction of organic compounds at high pressure and temperature

On the mechanism of carbon nanostructures formation at reaction of organic compounds at high pressure and temperature

Multistage reaction pathways in detonating high explosives

Effects of Aluminum Particle Size on the Detonation Pressure of TNT/Al

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