Simulation of Exploding Foil Initiator Flyers Driving Detonation

Flyers are the key components that determine the detonation ability of Exploding Foil Initiators (EFI). The incident attitude and velocity of the flyer are the decisive factors affecting the initiation of explosives. This work utilizes a new simulation method to simulate the impact detonation process of flyers. Here we simulate the process of flyers being cut and accelerated, impacting explosives and explosives being detonated. It is possible to obtain the orientation and dynamic velocity changes of the flyer during its motion and the propagation process of detonation waves in explosives. The results provide detailed flyer morphology during the operation of the EFI and pressure changes in explosives. The results indicate that during the formation process of 10 μm and 20 μm flyers, the flip will occur. Additionally, 20 μm and 25 μm flyers can detonate HNS-IV, while 10 μm and 30 μm flyers can not detonate HNS-IV.