Flow of RX-08-FK high-energy paste in a capillary rheometer
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)
- Mason Hanger--Silas Mason Company, Inc., Pantex Plant, Amarillo, Texas 79177 (United States)
The flow of RX-08-FK, a mostly organic, high-energy, paste-extrudable explosive containing about 75{percent} suspended solids, was experimentally studied. The paste was forced through long capillary tubes in a specially designed, double-piston rheometer at temperatures ranging from {minus}54 to +74{degree}C, and at nominal shear rates at the tube walls from 50 to 40000 s{sup {minus}1}. Paste was preconditioned for many hours to achieve the desired experimental temperature and the rheometer itself was enclosed in a preconditioned temperature-controlled chamber. We found the paste to be pseudoplastic with significant yield stress and entrance effects. The results of 176 runs at temperatures of {minus}35{degree}C and higher were fitted by an empirical model much like the {ital original} model suggested by Herschel and Bulkley, modified to include a factor correcting the stress for the substantial entrance loss experienced with this paste. The observed stresses at {minus}54{degree}C were substantially higher and less shear dependent than those extrapolated from the above model; these differences may relate to the fact that the glass-transition temperature of RX-08-FK is approximately {minus}60{degree}C. {copyright} {ital 1997 Society of Rheology.}
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 544550
- Journal Information:
- Journal of Rheology, Vol. 41, Issue 3; Other Information: PBD: May 1997
- Country of Publication:
- United States
- Language:
- English
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