Measurements of the DDT process in exploding bridgewire detonators

Eric S. Martin, Keith A. Thomas, Steven A. Clarke, James E. Kennedy, D. Scott Stewart

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The deflagration-to-detonation transition (DDT) of low density (0.88 g/cc) PETN during exploding bridgewire (EBW) initiation has been studied using laser interferometry and streak photography. Cutback experiments using VISAR have confirmed a 1.0 mm run-distance to detonation in this low density PETN powder. In a detonation system using a combination of low and high density powders, an apparent center of initiation (COI) analysis of streak data has yielded a surprisingly similar result. This data suggested that a compaction of low density powder to near theoretical maximum density (TMD) may occur before the onset of detonation, which is consistent with work done previously. These experiments show this is not the case and COI analysis reveals a non-ideal initial propagation front. Additionally, data show that although function time increases significantly with decreasing firing voltage, the apparent COI changes very little. This indicates that the detonation criterion is not dependent upon the rate of deflagration, but on a volume of material that must be burned in a confined space to create the critical pressure needed at the compaction front.

Original languageEnglish (US)
Title of host publicationSHOCK COMPRESSION OF CONDENSED MATTER - 2005
Subtitle of host publicationProceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
Pages1093-1096
Number of pages4
DOIs
StatePublished - 2006
EventSHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter - Baltimore, MD, United States
Duration: Jul 31 2005Aug 5 2005

Publication series

NameAIP Conference Proceedings
Volume845 II
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherSHOCK COMPRESSION OF CONDENSED MATTER - 2005: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
CountryUnited States
CityBaltimore, MD
Period7/31/058/5/05

Keywords

  • DDT
  • Detonation
  • Exploding bridgewire
  • Initiation
  • PETN

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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