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http://dx.doi.org/10.6108/KSPE.2017.21.5.080

An Experimental Study on Performance of a Miniaturized Exploding Foil Initiator using VISAR  

Yu, Hyeonju (Department of Mechanical and Aerospace Engineering, Seoul National University)
Jang, Seung-gyo (The 4th R&D Institute - 1st Directorate, Agency for Defense Development)
Kim, Kyu-Hyoung (Energetic Material and Pyrotechnics Department, Hanwha Research Institute of Technology)
Yoh, Jai-ick (Department of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.21, no.5, 2017 , pp. 80-87 More about this Journal
Abstract
The performance of a pyrotechnic device that consists of donor/acceptor pair separated by a bulkhead relies on shock attenuation characteristics of the gap material and shock sensitivity of the donor and acceptor explosives. In this research, a micro Kapton flyer was accelerated by an exploding foil initiator (EFI) to figure out shock sensitivity of hexanitrostilbene (HNS) to impact. The averaged shock pressure and duration imparted to the explosive by flyer impact are measured by using a velocity interferometer for any reflector (VISAR) and impedance matching technique. Consequently, this research shows the possibility to determine the critical flyer velocity for initiating the miniaturized pyrotechnic unit by determining the relations between the impact velocity, the amplitude and width of impact loading.
Keywords
Shock Initiation; Pyrotechnic; EFI; VISAR; Flyer Impact;
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