Processing Characteristics of Gun Propellants

✍ Scribed by F. S. Baker; R. E. Carter

• Publisher: John Wiley and Sons
• Year: 1982
• Tongue: English
• Weight: 690 KB
• Volume: 7
• Category: Article
• ISSN: 0721-3115
• DOI: 10.1002/prep.19820070602

✦ Synopsis

Abstract

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.