Enhanced Ignition Behavior Of Reactive Material Fragment Impacting Fuel-Filled Tank

Significantly different from the traditional inert metal fragment,reactive material fragment is an extremely efficient damage enhancement technology that incorporates the defeat mechanisms of kinetic energy and chemical energy. Thus,the reactive materials play a key role in research of the hit-to-kill warhead,and has been one of the cutting-edge research.Through theoretical analysis,numerical simulations and ballistic experiment,the enhanced damage effects of reactive fragment on full-filled fuel tank, including tank rupture and aviation kerosene ignition was investigated. On account of the hydrodynamic theory and impact-induced initiation and energy release behavior of reactive materials,an analytical model for initiation and destruction behavior of the reactive material on full-filled fuel tank is developed. The process of reactive material penetrating and destroying fuel tank was simulated by using LS-DYNA code to investigate the mechanical behavior. A preliminary regulation of the influence factors such as length to diameter ratio,impact velocity and wall thickness of the fuel tank,in the mechanical behavior of the structure damage were obtained by summarizing and analyzing the simulation results. Furthermore,the enhanced ignition and damage effects of reactive fragment by its chemical energy release and explosion effects on full-filled fuel tank were verified by ballistic experments. In terms of the fuel ignition criterion, the master mechanism of enhanced ignition effects was revealed,and the fuel ignition probabilities were derived. All in all, the research achievements have significant reference value on the development of air defense warhead.