Detonation in a heterogeneous explosive with a relatively sparse concentration of reaction centers (“hot spots”) is investigated experimentally. The explosive system considered is nitromethane gelled with PMMA and with glass microballoons (GMB’s) in suspension. The detonation velocity is measured as a function of the characteristic charge dimension (diameter or thickness) in both axisymmetric and two‐dimensional geometries. The use of a unique, annular charge geometry (with the diameter of the annulus much greater than the annular gap thickness) permits quasi‐two‐dimensional detonations to be observed without undesirable lateral rarefactions that result from a finite aspect ratio. The results confirm the prior findings of Gois et al. (1996) which show that, for a low concentration of GMB’s, detonation propagation does not exhibit the expected 2:1 scaling from axisymmetric to planar geometries. This reinforces the idea that detonation in highly nonideal explosives is not governed exclusively by global front curvature.
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28 December 2009
SHOCK COMPRESSION OF CONDENSED MATTER 2009: Proceedings of the American Physical Society Topical Group on Shock Compression of Condensed Matter
28 June–3 July 2009
Nashville (Tennessee)
Research Article|
December 28 2009
MEASUREMENT OF DETONATION VELOCITY FOR A NONIDEAL HETEROGENEOUS EXPLOSIVE IN AXISYMMETRIC AND TWO‐DIMENSIONAL GEOMETRIES
Andrew Higgins
Andrew Higgins
Dept. Mechanical Engineering, McGill University, Montreal, Quebec, H3A 2K6, CANADA
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AIP Conf. Proc. 1195, 193–196 (2009)
Citation
Andrew Higgins; MEASUREMENT OF DETONATION VELOCITY FOR A NONIDEAL HETEROGENEOUS EXPLOSIVE IN AXISYMMETRIC AND TWO‐DIMENSIONAL GEOMETRIES. AIP Conf. Proc. 28 December 2009; 1195 (1): 193–196. https://doi.org/10.1063/1.3295101
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