Structure of the detonation front in condensed explosives

Dremin, A. N.; Rozanov, O. K.; Savrov, S. D.; Trofimov, V. S.

doi:10.1007/bf00748594

Cited by 7 publications

(12 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is well known that shock wave critical pressure to initiate TNM is 8 GPa at the detonation pressure of P C-J =16 GPa [2,7]. Further, it will be shown that if NB content is more than 20%, the detonation wave front becomes unstable and pulsed.…”

Section: Tnm/nb Compositions With Up To 20% Of Nbmentioning

confidence: 88%

“…A qualitative picture of emerging local explosions and pulsed detonation is shown in fig.5 from [2,7]. A qualitative picture of emerging local explosions and pulsed detonation is shown in fig.5 from [2,7].…”

Section: Discussionmentioning

confidence: 99%

“…High particle velocities (more than 3.0 km/sec) might be explained by propagation of oblique detonation wave moving across SCE (see fig.5) [6,7]. Previously, similarly high pressures [2,7] were recorded in SCE waves traveling across shock-compressed HE in nitroglycerine (P~50 GPa). Previously, similarly high pressures [2,7] were recorded in SCE waves traveling across shock-compressed HE in nitroglycerine (P~50 GPa).…”

Section: Tnm/nb-74/26mentioning

confidence: 91%

“…Experimentally [1,2], in homogeneous HE(s) it was observed that detonation wave front might be both rough with pulsation in nitromethane (NM) and smooth in tetranitromethane (TNM). It was found that shock wave (SW) starts to propagate as in inert material but then turns to detonation jump wise.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Shock Wave Initiation of Mixture Liquid Explosives

Федоров¹,

Михайлов²,

Nazarov³

et al. 2006

AIP Conference Proceedings

View full text Add to dashboard Cite

We investigated initiation of liquid HE consisting of tetranitromethane (TNM) and nitrobenzene (NB). Smooth stable (when mass of NB<20%) and pulsing unstable detonation wave front was registered (20-50% NB). We registered shock wave, shock compressed explosive (SCE) detonation wave and normal detonation wave for unstable detonation front on different parts of the front. In case of normal and SCE detonation wave we registered parameters rise during 3-25 nsec until the start of chemical reaction. We consider it to be the induction period of thermal explosion inside detonation wave front.

show abstract

Section: Tnm/nb Compositions With Up To 20% Of Nbmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Tnm/nb-74/26mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Shock Wave Initiation of Mixture Liquid Explosives

Федоров¹,

Михайлов²,

Nazarov³

et al. 2006

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…As was postulated by Bowden and Singh, the initiation of explosives could be interpreted in terms of the redistribution of moving dislocations [39]. An abundance of models for hot spot formation to explain the shock and impact initiation, as well as the thermal decomposition of explosives, has been suggested since then, but none of them lead to the development of a comprehensive general theory in a widely agreed upon form partially due to the lack of knowledge about the microstructure of defects in explosive materials [40,41]. To clarify the situation and to select the proper models, we need to learn more about the electronic and spatial structure of lattice imperfections.…”

mentioning

confidence: 98%

Modeling Defect-Induced Phenomena

Kuklja

Rashkeev

2009

Static Compression of Energetic Materials

View full text Add to dashboard Cite

Elucidation of dissociation mechanisms, energy localization, and transfer phenomena in the course of explosive decomposition of energetic materials (EMs) are central for understanding, controlling, and enhancing the performance of these materials as fuels, propellants, and explosives. Quality of energetic materials is often judged using two main parameters: sensitivity to detonation and its performance. Low sensitivity is desired to make the material relatively stable to external stimuli, i.e., controllable and able of triggering rapid dissociation only when needed and not accidentally. Performance, on the other hand, is to be high to provide larger heat of the explosive reaction. These parameters do not necessarily correlate with each other and depend on many variables such as molecular and crystalline structures, history of samples, the particle size, crystal hardness and orientation, external stimuli, aging, storage conditions, and others. Mechanisms governing performance are fairly well understood whereas mechanisms of sensitivity are poorly known and need to be much more extensively studied. It is widely accepted though that the thermal decomposition reactions of the materials play a significant role in their sensitivity to mechanical stimuli and their explosive properties [1].The decomposition of energetic materials can be initiated with a mechanical impact, thermal heating, a shock wave, or a spark. Such events in solids generate molecules in highly excited vibronic and/or electronic states. Clearly, the decomposition of solid explosives under shock, spark, laser, or plasma ignition must include contributions from both ground and excited electronic states. Excitation in the UV can markedly reduce the power requirements for detonation of some secondary explosives. Therefore, establishing the initial steps of high explosive (HE) decomposition is an important goal to pursue. Decomposition triggered by excited electronic states seems appealing because electronic excitation of the system to an unstable potential energy surface can result in rapid dissociation of a molecule and consequent chain reaction.

show abstract

Simulation of Defects in Energetic Materials. 3. The Structure and Properties of RDX Crystals with Vacancy Complexes

Kuklja

Kunz

1999

J. Phys. Chem. B

View full text Add to dashboard Cite

Hartree−Fock calculations of a cyclotrimethylene trinitramine C3H6N6O6 (RDX) crystal containing vacancy dimers were performed using a periodic defect model and large supercells. Positive binding energies of the divacancies indicate that single vacancies attract each other in RDX crystals, thus forming defect complexes. One- and two-step processes of vacancy pair formation have been simulated. The density of states and band structure analysis show that the defect pairs narrow the fundamental optical gap. Mutual orientation within vacancy dimers considerably effects the electronic properties. A detailed comparison of perfect RDX, that containing a single vacancy, and that with a divacancy is presented. The role of these defects in the “hot spot” formation and shock initiation of explosions is discussed.

show abstract

Structure of the detonation front in condensed explosives

Cited by 7 publications

References 9 publications

Shock Wave Initiation of Mixture Liquid Explosives

Shock Wave Initiation of Mixture Liquid Explosives

Modeling Defect-Induced Phenomena

Simulation of Defects in Energetic Materials. 3. The Structure and Properties of RDX Crystals with Vacancy Complexes

Contact Info

Product

Resources

About