A series of shock initiation experiments on the explosive PBXC03 (87 % HMX, 7 % TATB, and 6 % Viton by weight) with different particle sizes and porosities under various shock loadings have been performed, and it is found that the particle size and the porosity of the explosives have much influence on the shock initiation characteristics. That is, the smaller the particle size, the more difficult the explosive to be ignited but the faster the detonation grows once the explosive is ignited. It is also found that the detonation grows the fastest in the explosive with moderate porosity. Moreover, a modified mesoscopic reaction rate model based on the experimental results and the pore collapse hot‐spot ignition mechanism is developed, which allows for a separate reaction mechanism evaluation at different reaction stages for the shock initiation and detonation growth processes in the explosives. The calculated pressure‐time histories and Pop‐Plots for PBXC03 are founded to be all in good agreement with the experimental data. The modified mesoscopic reaction rate model shows its potentiality for quantitatively predicting the effects of the mesostructure of PBXs on the shock initiation and detonation growth processes with a high degree of confidence.

中文翻译：

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不同粒径和孔隙率的基于HMX的PBX炸药中的嵌入式锰规测量和冲击起爆建模

在不同的冲击载荷下，对具有不同粒径和孔隙率的PBXC03炸药（87％HMX，7％TATB和6％Viton重量）进行了一系列冲击引发实验，结果发现，炸药的孔隙度对冲击起爆特性有很大影响。即，粒径越小，炸药就越难被点燃，但是一旦炸药被点燃，爆炸的发展就越快。还发现，在具有中等孔隙率的炸药中，爆炸增长最快。此外，根据实验结果和孔隙塌陷热点点火机理，建立了改进的介观反应速率模型，这允许在爆炸物的冲击起爆和爆炸生长过程的不同反应阶段分别评估反应机理。计算得出的PBXC03的压力时间历史和波普图与实验数据完全吻合。改进的介观反应速率模型显示了其潜力，可以高度可信地定量预测PBX介观结构对冲击引发和爆轰生长过程的影响。