The experimental analyses of ignition and burning responses of mild‐impacted granular explosive, namely, cyclotrimethylene trinitramine (RDX) and cyclotetramethylene tetranitramine (HMX), were performed based on an optimized drop‐weight system equipped with a High‐Speed Camera (HSC). It has been found that jetting phenomena observed by HSC is the result of the energy released by gaseous products, which push the pulverized or melted explosives to splash radially. Jetting is the only and the most obvious difference between reactive and inert particles prior to combustion so that it can be regarded as the sign of ignition more accurately than other ways. For RDX sample, the molten phase plays an important role in the hot‐spots formation. After a piece of waxed paper is put on the glass anvil, the jetting of molten‐phase RDX will be limited due to the high‐roughness of waxed paper. Moreover, ignition growth to burning probability of RDX particles is increased compared with the non‐waxed paper case. Radial deformation velocity, jetting velocity, and flame propagation velocity have been estimated via image processing, making it possible to quantify the violence of mechanical deformation and chemical reaction.

中文翻译：

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轻冲击载荷作用下颗粒炸药（RDX / HMX）的点火和燃烧发展

对轻度撞击的粒状炸药即环三亚甲基三硝胺（RDX）和环四亚甲基四硝胺（HMX）的着火和燃烧响应进行了实验分析，该分析基于配备了高速摄像头（HSC）的优化滴重系统。已经发现，HSC观察到的喷射现象是气态产物释放的能量的结果，气态产物推动了粉碎或熔化的炸药径向飞溅。喷射是燃烧前反应性粒子与惰性粒子之间唯一，最明显的区别，因此，与其他方式相比，喷射可以更准确地视为着火的迹象。对于RDX样品，熔融相在热点形成中起着重要作用。在玻璃砧板上放上蜡纸后，由于蜡纸的高粗糙度，熔融相RDX的喷射将受到限制。而且，与无蜡纸相比，RDX颗粒的着火增长到燃烧可能性增加。径向变形速度，喷射速度和火焰传播速度已经通过图像处理进行了估计，从而可以量化机械变形和化学反应的剧烈程度。