Accession Number : AD0449749


Title :   TRANSITION FROM SLOW BURNING TO DETONATION: ROLE OF CONFINEMENT, PRESSURE LOADING, AND SHOCK SENSITIVITY.


Descriptive Note : Progress rept.,


Corporate Author : NAVAL ORDNANCE LAB WHITE OAK MD


Personal Author(s) : Price, Donna ; Wehner, J Francis ; Roberson, George E


Report Date : 14 Sep 1964


Pagination or Media Count : 37


Abstract : Use of a high speed framing camera as well as ionization probes and strain gages in the Macek DDT experiment has produced quantitative information about the transition phenomena. It is shown that inertia of the containing walls plays a large part in the confinement of the burning pentolite. Thus, no wall motion can be detected photographically for about 30 microseconds after a pressure of one kbar is reached in the burning area. When wall motion does occur, it is at a radial velocity of 0.23 mm/microseconds or less, and results in a ballooning and pressure rupture of the tube; maximum distortion is about 8 mm from the ignition point. Plastic deformation of the tube up to a radial increase of 2 mm appears symmetric, and rupture does not occur until after steady-point of ignition. The critical pressure for initiation of detonation appears to be reached in the burning area prior to rupture. (Author)


Descriptors :   *EXPLOSIVES , DETONATIONS , BURNING RATE , CONFINEMENT(NUCLEAR REACTORS) , PRESSURE , PENTOLITE , SENSITIVITY , HIGH SPEED CAMERAS , IONIZATION GAGES , STRAIN GAGES


Distribution Statement : APPROVED FOR PUBLIC RELEASE