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In this paper, a launching system with a novel charge structure was proposed to improve the interior ballistic performance. According to the working characteristics of the novel launching system, a lumped‐parameter model was established. The parameters of the propellant and the interior ballistic characteristics of the launching system were obtained by experiments. According to the experimental results, the accuracy of the lumped‐parameter model was verified by code. The simulated results were in good agreement with the experimental results. Based on the lumped‐parameter model, the propellant parameters, such as the impetus, the burning rate, the web thickness, and the charge mass, were investigated to understand the interior ballistic performances of the launching system. An optimization method was proposed to design the propellant parameters of the launching system. The results show that the optimal scheme can increase the velocity of the projectile by 9.54 %. Compared with the traditional launching method, the velocity of the projectile is increased by 37.09 % while the peak pressure in the barrel has no change. [ABSTRACT FROM AUTHOR]

In order to improve the detonation performance of emulsion explosives, a new type of emulsion explosives with TiH2 powders is developed. The influences of the amount of sensitizers GMs and energetic additives TiH2 on explosion characteristics of emulsion explosives are studied to determine the optimum compositions. Underwater explosion and brisance testing experiments show that, compared to traditional GMs sensitized emulsion explosives, the shock wave specific impulse I and total energy E of GMs-TiH2 sensitized emulsion explosives are improved significantly, and the effect of TiH2 powders on improving the explosion power of emulsion explosives is better than that of Ti powders. The brisance of GMs-TiH2 emulsion explosives is 23.80 mm compression of lead block, 7.7 mm more than that of the emulsion explosives sensitized by GMs alone. Therefore, the hydrogen containing material TiH2 could be a promising energetic additive for developing high-power emulsion explosives. [ABSTRACT FROM AUTHOR]

In order to analyze the effect of aluminum fiber contents on the underwater explosion performance of RDX-based explosives, the pressure-time curves of composite explosives with different aluminum fiber contents are measured by underwater explosion experiments. Peak pressure, impulse, shock energy, and bubble energy were obtained by analyzing the curves. The results show that the peak pressures of composite explosives decrease with increasing aluminum fiber contents. The shock impulse of the 30 % aluminum fiber composite explosive is the highest in all composite explosives. The effects of the 20 % and 40 % composite explosives are nearly equal to that of the 30 % explosive, and the different values of shock impulse among them do not exceed 5 %. The specific shock energy of the 20 % aluminum fiber composite explosive is the highest in all composite explosives. The bubble energy and explosion energy of composite explosives increase with increasing aluminum fiber contents. [ABSTRACT FROM AUTHOR]

Magnesium hydride sensitized emulsion explosives can effectively reduce 'pressure desensitization' problems that traditional emulsion explosives encounter in utilization. Shockwave desensitization experiments and underwater explosion experiments show that, compared with traditional glass microspheres (GM) sensitized emulsion explosives, magnesium hydride sensitized emulsion explosives are better at resisting pressure desensitization. The microstructures of GM and magnesium hydride sensitized emulsion explosives before and after compression are studied with scanning electron microscopy, and the pressure desensitization resisting mechanism of magnesium hydride sensitized emulsion explosives is discussed. This work shows that reduction of 'hotspots' is the key factor of pressure desensitization of emulsion explosives through comparative research. [ABSTRACT FROM AUTHOR]