KINETIC REGULARITIES OF EXPLOSIVEDE COMPOSITION OF PETNCONTANIN GALUMINIUM, COBAL TANDNICKEL NANOPARTICLES

Abstract

The paper is devoted to the calculation of the main parameters of explosive decomposition of pentaerythritol tetranitrate (PETN) containing aluminium, cobalt and nickel nanosized particles in terms of the modernized ‘hot spot’ model. The following parameters were calculated – dependence of the nanoparticles absorptivity on their sizes in PETN matrix, space and time distribution of the temperature in ‘PETN – nanoparticle’ system initiated by the first and second harmonics of the YAG-Nd laser. The research showed that the particle’s diameter, corresponding to the absorption maximum, and the maximum peak value both depend on the irradiation wave length. For the first harmonic of the YAG-Nd laser the absorption maximum is observed in bigger nanoparticle sizes of aluminium, cobalt and nickel than for the second harmonic. At the same time the maximum peak value decreases considerably. The calculation of the minimal value of the critical energy density and the optimal nanoparticle sizes for each wave length was made. The results show that in all the examined inclusions critical energy density for the second harmonic is much smaller than for the first one. The results make it possible to predict the sensitivity of energetic materials to laser irradiation.

Keywords

• nanosized metals
• absorptivity
• simulation
• energetic materials