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Deflagration-to-detonation transition in granular HMXGranular HMX of three degrees of fineness was packed into heavy-walled steel tubes closed at both ends. Ignition was obtained at one end using an intimate mixture of finely divided titanium and boron as an igniter that produced heat with little gas. The distance to detonation was determined by examination of the resulting tube fragments. By inserting tightly-fitted neoprene diaphragms periodically into the HMX column, it was shown that the role of convective combustion was limited to the initial stage of the deflagration to detonation (DDT) process. Experiments in which various combinations of two of the three types of HMX were loaded into the same tube showed that heating by adiabatic shear of explosive grains was an essential factor in the final buildup to detonation. A description of the DDT process is developed in which conductive burning is followed in turn by convective burning, bed collapse with plug formation, onset of accelerated burning at the front of the plug through heating by intercrystalline friction and adiabatic shear, and intense shock formation resulting in high-order detonation.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Campbell, A. W.
(Los Alamos Scientific Lab. NM, United States)
Date Acquired
August 11, 2013
Publication Date
December 1, 1980
Publication Information
Publication: NASA, Washington The 1980 JANNAF Propulsion Systems Hazards Subcomm. Meeting, Vol. 1
Subject Category
Inorganic And Physical Chemistry
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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