AN EXPLODING FOIL INITIATOR SYSTEM

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Authors
  1. Nappert, L.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Detonators commonly used to initiate the explosive train resident in all weapon systems contain sensitive explosives. Therefore, a physical barrier between the detonator and the rest of the explosive train or a misalignment of the explosive components is maintained until arming to prevent the hazard of inadvertent warhead initiation. A new kind of detonator, the exploding foil initiator (EFI) also known as a slapper detonator, directly initiates secondary explosives and consequently requires no physical barrier or misalignment of the explosive components. This greatly simplifies the design of explosive trains by replacing physical barriers with electronic barriers (semiconductor switches). EFI technology was studied at DREV the last few years in order to gain a detailed understanding of the physical mechanisms involved in EFI operation. The EFI system described in this report evolved directly from this study. It is made up of a capacitor discharge circuit (CDC) constructed from a 0.1uF capacitor that could be charged to 3.5 kV. This CDC is used to explode 0.250-mm-wide copper foils that accelerate 0.025-mm-thick polyimide flyer plates to sufficient velocity to promptly detonate pressed pellets of fine-grained hexanitrostilbene (HNS) explosive powder. The experimental performance of the EFI system is compared with the predicted performance of modeling equations implemented in a computer software. The 50% detonation voltage was determined by using the Bruceton procedure and the
Keywords
Exploding foil initiators;Slapper detonators;Flying plate generators
Report Number
DREV-9502 — Technical Report
Date of publication
01 Mar 1996
Number of Pages
48
DSTKIM No
96-02403
CANDIS No
498223
Format(s):
Document Image stored on Optical Disk;Hardcopy

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