Abstract
This paper presents the results of measuring the thresholds of explosive decomposition of PETN–coal under the action of laser radiation pulses (\(\lambda\) = 1064 nm and \(\tau\) = 14 ns). Samples whose thickness is 1 mm and whose densities are 1.1 and 1.7 g/cm3 with inclusions of submicron particles of brown coal (750 nm) are investigated. Matrices in composites with densities of 1.1 and 1.7 g/cm3 are almost transparent for radiation. A minimum explosive threshold of 1.8 J/cm2 is reached with a concentration of inclusions of 0.5% (by weight). The explosion is adiabatic. Composites with a density of 1.1 g/cm3 have a scattering matrix. A minimum explosive threshold of 2.3 J/cm2is obtained for a concentration of inclusions of 1%. An extinction rate is estimated: \(k_{\rm ext}\) = 135 cm- 1. Radiation is absorbed at a depth of \(<\)0.1 mm. Explosive decomposition in an unirradiated section develops according to the shock-wave mechanism of explosive combustion.
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Aduev, B.P., Nurmukhametov, D.R., Belokurov, G.M. et al. Influence of the Density of PETN–Coal Composites on the Threshold Characteristics of Explosive Decomposition in Laser Initiation. Combust Explos Shock Waves 56, 231–236 (2020). https://doi.org/10.1134/S0010508220020148
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DOI: https://doi.org/10.1134/S0010508220020148