Abstract
The results of numerical ignition simulation of pentaerythritol tetranitrate (PETN), cyclotrimethylene trinitramine (RDX), cyclotetramethylene tetranitramine (HMX) and 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) by aluminium (Al) and molybdenum (Mo) films heated by nanosecond laser pulses in a three-layer system: glass–metal–explosive material (EM) are presented. Influence of metal film thickness on the time of EM ignition delay was considered. A non-linier dependence of time of delay of ignition of EM from thickness of a metal film is shown. The greatest critical thicknesses of Al and Mo metallic films at which ignition of EM is still possible were determined. It was established that the greater the thickness of the metal film and heat resistance of EM, the greater the heat reserve needed in EM ignition film. It was established that the ignition delay time of EM increases in the sequence of PETN, RDX, HMX and TATB.
Highlights
Experimental and theoretical studies on the numerical simulation of the ignition of explosive compositions have been associated primarily with the creation of lights detonators, whose noise immunity is much higher than that of electric detonators
Calculations have shown that the ignition of pentaerythritol tetranitrate (PETN), RDX, HMX and TATB occurs near the boundary of the metal film–explosive material (EM) (Figures 1–6)
It was established that the greater the thickness of the metal film and the thermal stability of EM, the more heat reserve in the film is needed for ignition of EM
Summary
Experimental and theoretical studies on the numerical simulation of the ignition of explosive compositions have been associated primarily with the creation of lights detonators, whose noise immunity is much higher than that of electric detonators. This is because the laser initiation is immune to electrical signals, which allows one to avoid accidental initiation of explosive material (EM). Organic EM in the impurity absorption region has an insignificant absorption coefficient. For example, they are practically transparent at the length of a neodymium λ ∼ 1.0 μm laser [1]. The initiation threshold of an explosive by a laser pulse is reduced by introducing light-absorbing particles into samples or by applying laser radiation-absorbing films on the explosive surface [2,4,10,14,15,18,19]
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