Detonation driving energy release characteristics of laminated composite charge of DNTF-based aluminized explosivesbased on cylinder tests

To investigate the releasing characteristics of detonation-driving energy in a laminated composite charge, a meticulously prepared composite charge of two distinct types of 3,4-dinitrofurazanfuroxan (DNTF) based explosives with uniform layer thickness was employed. These explosives demonstrated a noticeable detonation velocity difference of 1.85 km/s, one with exceptionally high detonation velocity while the other with exceedingly high detonation heat. The trajectory of the detonation wave at the bus bar of the composite charge was observed using the GSJ streak camera to analyze the velocity change process of the detonation wave as it crossed the two explosives. Subsequently, a $\varnothing$25 mm cylinder test was conducted to assess the expansion velocity and specific kinetic energy of the copper tube in the corresponding area of each explosive by using the photon Doppler velocimeter (PDV). The rupture process of the copper tube was observed synchronically using a high-speed framing camera to gain further insights. Lastly, the interaction process between the two explosives was investigated based on the pressure-volume relationship of the detonation products for each explosive, and the main difference in the energy release process between the laminated composite charge and the single charge was carefullydetermined. The results demonstrated that both explosives within the laminated composite charge swiftly transition into a stable detonation state as the detonation waves propagate alternately. When the products expand, the interaction between the two explosives significantly alters the distribution characteristics of the detonation-driving energy. The loading area of the high detonation velocity explosive enlarges, leading to a decrease in the velocity of the copper tube, resulting in a 6.7% reduction in its specific kinetic energy compared to the simple high detonation velocity charge. Conversely, the loading area of the high detonation heat explosive reduces, causing an increase in the velocity of the copper tube, resulting in a 14.1% improvement in its specific kinetic energy compared to the simple high detonation heat charge. Additionally, the detonation products of the high detonation heat explosive are in a compressed state, which is advantageous for enhancing the reaction rate of its aluminum powder and is expected to further enhance the detonation driving capability of the laminated composite charge.