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Processing Characteristics of Gun Propellants
Author(s) -
Baker F. S.,
Carter R. E.
Publication year - 1982
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.19820070602
Subject(s) - propellant , extrusion , rheometer , materials science , rheology , composite material , shear (geology) , sigma , yield (engineering) , analytical chemistry (journal) , chemistry , physics , chromatography , organic chemistry , quantum mechanics
Using especially modified torque and capillary extrusion rheometers the rheological behaviour of a typical triple‐base gun propellant has been examined as a function of such processing variables as temperature, solvent content, time taken to incorporate, filler content and filler shape. Propellant doughs flow according to the law \documentclass{article}\pagestyle{empty}\begin{document}$ \sigma -\sigma _0 = {\rm K}\dot \gamma ^{\rm n} $\end{document} where σ is the shear stress applied to the dough to maintain a shear rate of γ, σ 0 is the yield stress at which flow commences, K is the consistency index and n is the flow behaviour index. Variations in these constants as a function of the above mentioned variables are presented and their implications discussed. Resultant changes in the physical properties of the dried extruded propellant also are monitored.