DETONABILITY LIMITS OF LIQUID EXPLOSIVES IN POROUS MEDIA

Authors
  1. Lee, J.H.
  2. Frost, D.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN);McGill Univ, Montreal QUE (CAN) Dept of Mechanical Engineering;Institute of Chemical Physics, Chernokolovka (USSR)
Abstract
The characteristics of the propagation of a detonation in chemically sensitized nitromethane in a dense porous medium are investigated. By introducing liquid NM + 15% (by weight) DETA into a densely packed bed of spherical glass beads, a highly heterogeneous explosive mixture is obtained. The average bead size is varied from 66 mu m to 2.4 mm in diameter. The critical (i.e. failure) charge diameter of this mixture is systematically measured in unconfined charges over a wide range of bead sizes. Velocity measurements are also made for the various charges. It is found that there exists a critical bead size above which the critical diameter decreases with increasing bead size and below which it decreases with decreasing bead size. This result indicates an abrupt change in the mechanism of propagation at the critical bead size. Velocity measurements further support this by emphasizing the different behavior above and below the critical point.
Report Number
DRES-CR-93-24 — Contract Report (Final)
Date of publication
20 Jul 1993
Number of Pages
23
DSTKIM No
93-04563
CANDIS No
135317
Format(s):
Hardcopy;Originator's fiche received by DSIS

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