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On the Break‐Up of Shaped Charge Jets
Author(s) -
Haugstad B.
Publication year - 1983
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/prep.19830080407
Subject(s) - shaped charge , jet (fluid) , radius , perturbation (astronomy) , mechanics , wavelength , physics , plasticity , constant (computer programming) , classical mechanics , mathematics , thermodynamics , optics , chemistry , quantum mechanics , programming language , computer security , organic chemistry , computer science , explosive material
It is shown from dimensional arguments that the semi‐empirical jet break‐up formula of Hirsch (1) is consistent with physical models characterized by ideal plasticity (yield stress σ 0 ), the material initial density (ϱ 0 ), strain rate (η 0 ), and jet radius (r 0 ). Similar arguments applied to a one‐dimensional jet stretching model yields the existence of a maximum unstable perturbation wavelength, and fixes its value to within a numerical constant. Within the class of physical models considered the plastic velocity appearing in the Hirsch formula, the incremental velocity between successive fragments of a particulated jet, and the velocity (σ 0 /ϱ 0 ) 1/2 are all related, as originally conjectured by Hirsch.