Research On Enhanced Initiation Behavior Of Reactive Material Fragment Impacting Covered Explosive

Reactive material fragment and its application on warhead are one of research focuses in air defense and anti-missile technology. Honored as a key technology for the next generation hit-to-catastrophically kill warhead, reactive materials have been intensively studied abroad and domestically in recent years.This dissertation focuses on the enhanced initiation behavior and mechanism of reactive material fragment impacting covered explosive through theoretical analysis, numerical simulation and experimental research combined. Firstly, numerical simulation of metal fragment impacting covered explosive is conducted on AUTODYN code. The influence of fragment and plate parameters on critical initiation velocity is obtained. On the basis of Powder-Burn model for describing impact-induced initiation, the influence of projectile/target interaction conditions on deflagration efficiency and remained mass of reactive material fragment perforating plate is simulated. The characteristics of deflagration chemical energy release for reactive materials and the distribution of temperature and pressure within the explosive are obtained. Based on one-dimensional shock wave theory, an enhanced initiation model for reactive material fragment impacting covered explosive is developed, by which the influence of projectile/target condition on initiation effect is obtained. Moreover, ballistic impact experiment investigating enhanced initiation behavior of reactive materials impacting covered explosive are also performed. Experimental results show a good fit with theoretical analysis and simulations. The enhanced initiation mechanism is discussed.