活性破片引爆屏蔽装药机理研究

采用弹道实验对活性破片引爆屏蔽装药作用行为进行研究,且与同质量钨合金破片引爆能力进行对比,并基于AUTODYN-2D平台对破片冲击起爆屏蔽装药行为展开数值模拟研究,通过数值模拟与实验结果的对比得到活性破片引爆屏蔽装药机理.结果表明,10g活性破片在1 287m/s以上碰撞速度下,能可靠引爆设有10mm厚LY12硬铝或6mm厚A3钢面板的注装B炸药,而同质量钨合金破片在1 527m/s碰撞速度下,只能造成屏蔽装药碎裂而不能将其引爆.活性破片撞击金属面板后,自身在装药内部发生的剧烈化学反应是其引爆装药的主控机制,这显著降低了破片引爆屏蔽装药所需的动能.

Study on Initiation Mechanism of Reactive Fragment to Covered Explosive

The initiation behavior of covered explosives by reactive fragments was studied by ballistic experiments, and its initiating ability was compared with that to the explosive subjected to impact of the tungsten alloy fragment having the same mass as the reactive ones. The shock initiation behaviour of fragments to covered explosives has been simulated in the platform of AUTODYN-2D, and the initiation mechanism of reactive fragment was distinctly obtained by comparison of the numerical and experimental results. The research shows that the reactive fragment with a mass of 10g and a velocity above 1287m/s is able to initiate the Composition-B covered by a 10mm thick aluminum plate or a 6mm thick A3 steel plate. However, the tungsten alloy fragment only results in mechanical damage on the covered explosive and fails to initiate the Composition-B at an impact velocity of 1527m/s. The dominant initiation mechanism of reactive fragment to covered explosive is the violent chemical reaction of reactive materials inside the explosive, which decreases significantly the demand of kinetic energy for the fragment.