The Research Of Interaction Mechanism Between Laser And Energetic Materials

The interaction characteristics and mechanism of Nd³⁺:YAG laser and energetic material were studied in this dissertation. The main works and achievements are presented as follow:(1) Research on the ignition characteristics of B/KNO₃, Nickel Hydrazine Nitrate and Zr/KClO₄ of different mass ratio initiated by laser, i.e., ignition sensitivity, ignition delay time. The results show that the mass ratio could affect the characters of laser ignition of Zr/KC104 and have a best mass ratio. When the energy is small the delay time was decreased as the laser energy density, but when the laser energy came to a bigger degree the delay time was increased as the laser density induced by the ablation and plasma.(2) Research on the ablation of RDX, HNS, PETN and HMX initiated by laser. The ablated spot is observed by EMS. Research on the characteristics of RDX, HNS, PETN, HMX and boron and carbon in them initiated by laser. The studied result show that boron and carbon can advanced the absorption coefficient of RDX, HNS, PETN and HMX, and the energetic material in the confined state using a glass as a window for laser can improve the critical energy and shorten the delay time.(3) Research on the critical energy and delay time of B/KNO3 and B/KNO3 with 5% resin in open and confined state. The results show that resin and using a glass as a window can improve the critical energy and shorten the delay time.(4) A transient, one-dimensional and two-dimensional solid-phase model for laser ignition based on thermal mechanism is developed in the dissertation, It calculated the temperature history of laser ignition process when the main parameters of laser and the energetic material are varied and discusses the regularity of laser ignition. Comparing the results of calculation with the experimental results done by the predecessors shows the model being correct on the whole.(5) Laser ignition molten and ablation model are developed based on the former work. The results show that the temperature curve of molten model keep invariable when the surface temperature came to the molten point, and the temperature curve of ablation model will appear fluctuant.