MESOSCALE STUDY ON EXPLOSION-INDUCED FORMATION OF REACTIVE GRANULAR JET

The formation process of reactive materials shaped charge is investigated by numerical simulation. In order to study the mesoscale mechanism of PTFE/Al composite reactive jet forming, a meso-discrete model of PTFE/Al reactive liner with different particle size distribution of aluminum particles is established based on the principle of random delivery. The Euler algorithm is used to carry out the mesoscale numerical simulation of PTFE/Al reactive jet forming. The results show that the PTFE/Al reactive liner form the high velocity jet driven by the explosion load. The velocity of PTFE phase and aluminum phase in the jet is different to a certain extent, and the content of aluminum particles appears an increasing trend along the head to slug of the jet. The particle size distribution of aluminum particles has a significant effect on PTFE/Al reactive liner jet forming. On the one hand, when the particle size difference of aluminum particles is 400μm, the head velocity and jet length of the reactive jet are the largest. At the same time, the decrease of particle size difference of aluminum particles will increase the area of high pressure area inside the reactive jet. On the other hand, under the same particle size difference, the area of high pressure area decreases and the degree of particle breakage decreases if the content of large particle size aluminum particles increases, while the content of high-temperature aluminum particles at the front end of the reactive jet increases if the content of small-sized aluminum particles increases.