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Shock Initiation of the Triaminotrinitrobenzene‐Based Explosive JBO‐9021 Measured with a Photon Doppler Velocimeter
摘要： Triaminotrinitrobenzene (TATB) is an important insensitive high explosive because of its low shock sensitivity and high energy. The evolution of shock into the detonation of TATB requires academic attention and research. A multi-points laser interferometer termed a photon Doppler velocimeter and a rotating mirror streak camera were used to study the shock initiation of detonation in a pressed solid explosive formulation, JBO-9021, which contained 85 wt.% TATB, 10 wt.% HMX and 5 wt.% Kel-F binder. In conventional experiments, the test explosive was assembled by using several columniform explosives with different external diameters. A new device was designed to solve complex problems. This device comprised a wedge-shaped explosive sample and a transparent window, and by using this device, the particle-velocity histories of eight shock positions and the shockwave velocity could be obtained. A series of shock-initiation experiments on high explosive JBO-9021 was performed, and the explosive samples were initiated at different intensity input shocks by an explosive-driven attenuator. The photon Doppler velocimeter was used to detail the growth from an input shock to detonation, and the increase in particle velocity in unreacted JBO-9021 was also obtained in low-intensity shock-initiation experiments. The shock velocity was measured with a rotating mirror streak camera in one experiment. Hugoniot data for JBO-9021 in the form of a shock velocity versus a particle velocity and the initial shock pressure versus a distance-to-detonation relationship (Pop-plot) were obtained. Based on the experimental results, the shock-sensitivity characteristic of JBO-9021 was described.
关键词： Shock initiation,Hugoniot,TATB,Pop-plot,Photon Doppler velocimeter
更新于2025-09-23 15:19:57
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The Effect of Metal Film Thickness on Ignition of Organic Explosives with a Laser Pulse
摘要： 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.
关键词： TATB,Al film,simulation,explosive,laser ignition,HMX,Mo film,PETN,RDX
更新于2025-09-12 10:27:22
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Effect of Decomposition of CuO Film on Ignition of Organic Explosives by a Laser Pulse
摘要： This work presents experimental results of the PETN ignition in a three-layer system: glass – copper oxide (CuO) – explosive materials (EM) and results of numerical simulations of the ignition of PETN, RDX, HMX, and TATB with a CuO film heated by a YLS-150 fiber laser with a pulse duration of 20 ms. In the numerical simulations, the endothermic reaction of decomposition of the CuO film and decomposition reaction of EM were taken into account. It has been established that the endothermic effect of the CuO decomposition reaction increases the dynamic ignition delay time of EM. The expression for an estimation of width of a reaction layer in EM at heating by a constant heat stream is obtained. Calculations have shown that the dynamic threshold of ignition of organic explosives by laser pulse in a three-layer system (glass – CuO – EM) has a minimum for the thickness of the copper oxide film of 5 mm. The density of the critical ignition energy of an explosive laser pulse increases in the sequence of PETN, RDX, HMX, and TATB. The calculated dependence of the PETN dynamic ignition delay time on the thickness of the CuO film is consistent with the experimental data.
关键词： PETN,explosive,RDX,TATB,copper oxide,HMX,laser ignition,simulation
更新于2025-09-11 14:15:04