炸药燃烧产物驱动裂纹动态扩展耦合特性

为了研究炸药燃烧产物驱动基体中裂纹动态扩展的耦合特性,加深对武器装药意外点火后反应进入裂纹形成对流燃烧引发高烈度反应的机理性认识,采用热点火方式对某奥克托今(HMX)基(质量分数为95%)高聚物粘结炸药PBX预置缺口点火,采用数字高速摄影技术对炸药燃烧产物驱动裂纹动态扩展过程开展了实验研究。结果表明,由于高聚物粘结炸药(PBX)存在较强的细观非均匀性,同一种炸药的不同样品细观结构也不完全相同,导致其裂纹扩展路径存在差异(可能沿直线传播,也可能会发生偏转),但是在相同的约束条件和预应力下其扩展速度基本一致,本研究实验条件下,该PBX炸药裂纹扩展平均速度为146.7 m·s~(-1)。

Coupling Properties of Crack Penetration Driven by Explosive Burning Products

In order to investigate the characteristics of crack penetration in explosive bulk driven by burning products, and deepen the mechanism understanding on the process of high intensity reaction induced by burning products entering into cracks and forming convective burning under accidental ignition. The penetration of cracks in a HMX-based PBX (with a content of 95% for HMX) under thermal initiation at the preformed gap was photographed by the high-speed camera. Experimental results reveal that, due to the strong meso-heterogeneity of polymer bonded explosive (PBX), different samples of the same kind of explosive have different meso-structures, which results in the difference of crack propagation paths (which may propagate in a straight line or deflect)., Velocities of the crack penetration are nearly the same under same confinement and same pre-load stress. The average crack penetration velocity is about 146.7 m·s^-1 in the experimental condition of this research.