Assessing safety conditions in underground excavations after a methane-air mixture explosion

Nalisko, М.М.; Соболев, Валерий Викторович; Rudakov, Dmytro; Bilan, N.V.

doi:10.1051/e3sconf/201912301008

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…To obtain the same pulse density, coatings of different thicknesses are required, i.e., using composites of different formulations, it is possible to change the exposure duration in a certain range. The pulse was determined using a pendulum [66,67] on the samples with a surface mass density (10−100 mg/cm 2 ) of the composite. The voltage oscillograms show that the plane front of a shock wave degenerates into the spherical one [68].…”

Section: Measurement Of the Lsec Explosion Pulsesmentioning

confidence: 99%

Profiled Detonation Waves in the Technologies of Explosion Treatment of Metals

Sobolev,

Skobenko,

Kononenko

et al. 2024

Metallofiz. Noveishie Tekhnol.

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A short review is represented concerning physicotechnical features of current technologies, plane-wave, converging cylindrical and spherical detonation waves used in physics and chemistry of high energy densities, physics of metals, materials science, machine building, and mining and metallurgical industry. The main drawbacks of existing technologies are shown, and attention is focused on the technical nature of the reasons limiting their application. Attention is paid to solving the problem of simultaneous initiation of detonation of the entire surface layer of a light-sensitive explosive, regardless of the shape of the surface. A physical and mathematical methodology for estimating shock-wave parameters of an explosive during initiation of detonation in it by explosion of the initiation layer of the charge of a lightsensitive explosive composite is proposed. Prospects of practical application of detonation (shock) waves of the specified profile formed by laser ignition of the surface of a light-sensitive explosive composite are discussed. Physicochemical potential of the system of laser initiation of detonation makes it possible to form any wave profiles and get pulses of the intensity from 0.1 to 1.0 kPa⋅s on the surfaces being more than 1 m 2 . Precision and safe system of laser initiation can be used during any types of blasting operations including the ones that cannot be implemented principally, while applying standard systems for initiating explosives and means of explosion.

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Section: Measurement Of the Lsec Explosion Pulsesmentioning

confidence: 99%

Profiled Detonation Waves in the Technologies of Explosion Treatment of Metals

Sobolev,

Skobenko,

Kononenko

et al. 2024

Metallofiz. Noveishie Tekhnol.

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“…A laserinduced flat detonation wave in explosive charge 7 was followed by explosion of the initiating layer that contained BC2 lightsensitive com posite 6 with a mass density of 300 mg/cm 2 and a coating thick ness about 2 mm (Fig. 1, b) [38][39][40]. A flat detonation front formed by explosive charge 7 accelerated striking metal plate 9.…”

Section: Udc 66901mentioning

confidence: 99%

Influence of mechanical and thermal treatments on microstructural transformations in cast irons and properties of synthesized diamond crystals

Соболев¹,

Губенко²,

Rudakov³

et al. 2020

Nauk. visn. nat. hirn. univ.

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Influence of MechAnIcAl AnD therMAl treAtMents on MIcrostructurAl trAnsforMAtIons In cAst IronsAnD propertIes of synthesIZeD DIAMonD crystAls purpose. To analyze how the structural transformations in the cast iron metal matrix near graphite inclusions influence the features of synthesis of metastable diamond crystal on diamond polycrystals (substrate) synthesized by shockwaves.Methodology. In experiments, we used the laserinduced detonation of explosive charges to create a flat shockwave front and employed chemical, microstructural, spectral and Xray phase analyzes. In particular, the features of chemical element distribu tion in cast iron phases, dislocation density in a solid solution, crystal lattice parameters, and others were studied.findings. It has been shown that solidphase autoepitaxy is a physically justified, experimentally proved and stably reproduc ible phenomenon. The accelerated transfer of carbon atoms to the surfaces of metastable diamond growing crystals in the kinetic mode is facilitated by a number of factors that cannot be quantified by numerically evaluated parameters. These include, first of all, the microstructure of the growing medium (cast iron matrix), carbon source, temperature and deformation fields that ensure transformation of polymorphic graphite to diamond with emerging gradient stress fields at the stages of forging, exposure to shock waves and thermal cycling. Defect redistribution in the crystal structure of the metal matrix and graphite inclusions plays a certain role at the mesoscale. It has been found that saturation with microstructural defects brings higher physicochemical activity to the system in the whole. originality. For the first time in world practice, diamond single crystals have been synthesized that contain the inclusions of polycrystalline diamond particles of shockwave origin inside the single crystal shell; this may indicate a general discreteness of natural diamond formation.practical value. The growth of single metastable crystal on polycrystalline diamond of shock wave synthesis is the most favor able in case of using austenitic gray cast iron with foliate graphite inclusions. The experimentally proved diamond growth in a solid medium under pressure and temperature within the range of graphite stability can be used to develop new lowenergy tech nologies for the synthesis of metastable diamond single crystals.

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Improvement of safety management system at the mining enterprises of Ukraine

Kobylianskyi¹,

Mуkhalchenko²

2020

Min. miner. depos.

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Assessing safety conditions in underground excavations after a methane-air mixture explosion

Cited by 4 publications

References 9 publications

Profiled Detonation Waves in the Technologies of Explosion Treatment of Metals

Profiled Detonation Waves in the Technologies of Explosion Treatment of Metals

Influence of mechanical and thermal treatments on microstructural transformations in cast irons and properties of synthesized diamond crystals

Improvement of safety management system at the mining enterprises of Ukraine

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