强约束固体炸药燃烧裂纹网络反应演化模型

A theoretical model for burning-crack networks is developed to characterize the non-shock initiation reaction growth behavior of solid explosives with strong confinement and give a quantification of reaction violence. The model is verified by comparing the calculated results with the experimental data. It is found that the stronger the confinement is, the faster the self-sustaining enhanced combustion is, and the more violent the reaction is for confinement failure. Moreover, the larger the charge size is, the longer the process of crack pressurization caused by gas flow and surface combustion at the initial reaction stage is, but the more violent the reaction is at the later self-sustaining enhanced combustion, and the greater the reaction degree is for confinement failure. The ignition intensity has no significant effect on the final reaction intensity of explosive charge. The results show that the theoretical burning-crack networks model is suitable for describing the effects of the intrinsic combustion rate of explosives, the confinement strength, the charge structure size, the air-gap volume and the pressure relief vent on the reaction growth of explosive charge, thus providing a theoretical method for the explosive safety design and the evaluation of explosives reaction violence.