The Structure Design And Performance Study Of Explosive Foil Initiator

Exploding foil initiation system used in a variety of strategic and tactical weapons is an insensitive initiation device which develops towards integration and miniaturization. In this paper, we have studied the explosive foil initiation system in two aspects:the pulse power supply and the slapper detonator in order to improve the energy utilization rate of the system and reduce the threshold voltage of initiation of slapper detonator. The main research contents of this paper are as follows:With the selection of major devices and the designing of inverter circuit, feedback circuit and rectifying circuit, we have made a pulse power supply prototype with adjustable voltage. In the initiating circuit containing the pulse power supply, the inductance value is maintained at 65nH, the resistance decreases with the increase of charging voltage, the output efficiency is the highest in 1.8kV, and the prototype can initiation of HNS-IV successfully, which can meet the requirements of the experiment.Cu film and Cu/Al/Ni and Al/Ni/Cu composite films were prepared on ceramic substrates by magnetron sputtering technique.Pulse laser micro machining technology was used to etching the shape of the exploding bridge to avoid the complex process of traditional mask technology. After exploring experiment to determine the reasonable laser processing parameters and technological process, we have made the square, the annular and the parallel type exploding foil bridge successfully.By electrical explosion experiment and initiating of HNS-IV experiment, we found that the annular bridge has the best of electrical exploding performance in the low voltage range (less than 1600V), but its ability of initiating of HNS-IV is less than the square bridge foil. In the Cu/Al/Ni composite film, the addition of Al/Ni layer enhances the output capability of the bridge foil, and reduces the threshold value of the slapper detonators with whose initiation energy is 0.2J.Using LS-DYNA finite element software, the process of the polyimide film with different thickness, diameter and hitting posture initiating of HNS-IV is simulated. The influence of different states of the flying plate on the speed threshold of the shock initiation of the HNS-IV is obtained.