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Threshold Energy: A Dimensional Extension of the Critical Energy for Jet Attack Application
Author(s) -
Peugeot F.,
Quidot M.
Publication year - 1998
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/(sici)1521-4087(199808)23:4<188::aid-prep188>3.0.co;2-n
Subject(s) - explosive material , range (aeronautics) , thermodynamics , jet (fluid) , projectile , mechanics , physics , chemistry , materials science , composite material , organic chemistry , quantum mechanics
The critical energy criterion ( E c ) developed by Walker and Wasley is widely used to determine the response of explosive submitted to flyer plate impacts. As it has been shown previously to be limited in the pressure range over which it applies, in the number of explosive formulations which appear to obey it and in the range of projectiles covered by it, we have modified twice this criterion. The first modification, taking into account a trend toward lower minimum energy with increasing pressure (pressure fluence) enables it to be applied to explosives previously found to be outside the original criterion and to extend the pressure range. The second modification taking into account a trend toward higher minimum energy with decreasing impact surface area (impact surface dependence) is a bidimensional extension of the critical energy concept. The threshold energy per unit area thus defined allows to predict the shock initiation limits of bare explosives (PBX and cast formulations) impacted by shaped charge jets.