Reaction zone structure and detonation parameters of nitromethane/polymethylmethacrylate and its mixture with microballoons

Mochalova, V. M.; Уткин, А. В.; Shakula, Mikhail; Lavrov, V. V.; Savchenko, A. Ia.; Yakushev, V. V.

doi:10.1063/5.0048210

Cited by 5 publications

(2 citation statements)

References 43 publications

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“…The experimental studies of steady-state detonation waves in CL-20 show that the structure of the chemical reaction zone corresponds to the Zeldovich-von Neumann-Döring theory [38][39][40], assuming the existence of the von Neumann spike. The determination of the characteristic reaction time was not carried out in this work, since in order to accurately find this value, a special series of experiments are required to be conducted, e. g. [41]. Nevertheless, based on the obtained particle velocity profiles, it is concluded that this time is about 50 ns at the CL-20 initial density of 1.98 g/cm 3 .…”

Section: Steady-state Detonation Of Cl-20mentioning

confidence: 99%

Shock Initiation and Detonation Parameters of Hexanitrohexaazaisowurtzitane (CL‐20)

Уткин

Mochalova

Zubareva

et al. 2022

Propellants Explo Pyrotec

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Experimental studies of the reaction zone structure in hexanitrohexaazaisowurtzitane (CL-20) at different initial densities with a multichannel VISAR laser interferometer have been carried out. It is shown that the flow in the reaction zone corresponds to the Zeldovich-von Neumann-Döring theory with a characteristic reaction time of 50 ns. The dependence of the detonation velocity on the initial density is well approximated by a similar line for HMX with a charge diameter of 20 mm. With a decrease in diam-eter to 4 mm, a sharp drop in the detonation parameters of CL-20 has been recorded. The initiation of detonation under shockwave action is investigated, and the comparison of data for CL-20 and PETN has shown that their shockwave sensitivity is quite close. The experiments on the acceleration of thin steel plates by detonating CL-20 charges have been performed, and it is found that its accelerating ability is higher than that of HMX and retarded RDX.

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Section: Steady-state Detonation Of Cl-20mentioning

confidence: 99%

Shock Initiation and Detonation Parameters of Hexanitrohexaazaisowurtzitane (CL‐20)

Уткин

Mochalova

Zubareva

et al. 2022

Propellants Explo Pyrotec

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“…To evaluate the contribution of microencapsulated explosives to an energetic formulation, detonation studies were performed; and results were compared to similar tests using a variety of inert additives. Hard, high-melting additives, such as glass microspheres or balloons, may aid the initiation of explosive formulations by acting as hot spot nucleation points for the growth and propagation of detonation, but they also sensitize the formulation to impact and friction [13,14]. Chemically inert, glass microballoons have been reported to increase the detonation velocity in an ammonium nitrate emulsion explosive [15].…”

Section: Introductionmentioning

confidence: 99%

Modifying explosive behavior with additives

Busby

Smith

Sheehan

et al. 2023

Propellants Explo Pyrotec

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The influence of additives on the detonation velocity of a polyethylene wax/RDX formulation was examined. Additives included species of various shock impedance: glass microballoons; glass microspheres; polymethyl methacrylate (PMMA) microspheres; thermally expandable microspheres (TEMs); and PMMA microencapsulated pentaerythritol tetranitrate (PETN). Performance of the insensitive explosive 2,4‐dinitroanisole (DNAN) was enhanced by addition of PETN‐either neat or encapsulated, but encapsulation did not increase the sensitivity of the formulation. The energy contribution of the encapsulated PETN to the detonation front of the insensitive explosive 2,4‐dinitroanisole (DNAN) was also demonstrated. Present in 5 wt%, the encapsulated PETN allowed DNAN to sustain a reaction (5.36 km/s) at 13 mm, well below its critical diameter.

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Effect of charge diameter on detonation parameters in the mixture of gelled nitromethane/microballoons

et al. 2023

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In this work, the detonation wave structure and detonation parameters of mixtures of gelled nitromethane (NM) with hollow glass microballoons (GMBs) are investigated with a laser velocimetry technique. It is shown that the addition from 0.5 to 13 wt. % GMB with the mean diameter of 70 μm does not qualitatively change the reaction zone structure of gelled NM, and it corresponds to the Zeldovich–von Neumann–Döring theory, predicting the formation of the von Neumann spike. The detonation parameters of the explosive mixture monotonically decrease—in particular, the ideal detonation velocity drops from 6.3 km/s for gelled NM to 3.7 km/s for its mixture with 13 wt. % GMB. The addition of GMB leads to a significant reduction in the critical detonation diameter, which decreases from 16.5 mm in gelled NM to 3.5 mm in the mixture with 8 wt. % GMB. The influence of polymethylmethacrylate concentration in the mixture of gelled NM with GMB on the value of critical diameter of the mixture is observed.

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Reaction zone structure and detonation parameters of nitromethane/polymethylmethacrylate and its mixture with microballoons

Cited by 5 publications

References 43 publications

Shock Initiation and Detonation Parameters of Hexanitrohexaazaisowurtzitane (CL‐20)

Shock Initiation and Detonation Parameters of Hexanitrohexaazaisowurtzitane (CL‐20)

Modifying explosive behavior with additives

Effect of charge diameter on detonation parameters in the mixture of gelled nitromethane/microballoons

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