A new experimental technique was developed to directly observe the onset of shock initiation in powder mixtures contained in recovery capsules over time scales ranging from hundreds of nanoseconds to at least hundreds of milliseconds. Simultaneously with a thermocouple embedded in the test mixture to monitor bulk temperature changes, a photomultiplier tube detected light emissions produced by the reacting sample. A window/optic fiber system was developed that remained intact and did not move during the experiment. A polycarbonate window was placed into a steel recovery capsule, which was held solidly in place in a steel anvil designed to protect the fiber optic and to prevent motion of the window. Samples of as-blended 5Ti+3Si powders and ball-milled mixtures 5Ti+3Si were tested in this setup. In all experiments, a weak light emission peak was observed upon shock passage followed by much more intense light beginning a few milliseconds to a few hundreds of milliseconds later. The intense light emissions occurred at approximately the same time as a bulk temperature increase measured with the thermocouple. These results suggest that only a very small fraction of the sample was initiated by the shock.
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29 March 2012
SHOCK COMPRESSION OF CONDENSED MATTER - 2011: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
26 June–1 July 2011
Chicago, Illinois
Research Article|
March 29 2012
Experimental technique for direct observation of onset of reaction in shocked powder mixtures
Francois-Xavier Jetté;
Francois-Xavier Jetté
817 Sherbrooke St. W.,
Canada
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Sam Goroshin;
Sam Goroshin
McGill University, Dept. of Mech. Eng., Montreal,
Canada
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Andrew Higgins;
Andrew Higgins
McGill University, Montréal, QC, Canada H3A 2K6,
Canada
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David Frost;
David Frost
McGill University, Department of Mechanical Engineering, Montréal,
Canada
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Julian Lee
Julian Lee
Defense Research and Development Canada, Suffield, AL, CA,
Canada
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AIP Conf. Proc. 1426, 426–429 (2012)
Citation
Francois-Xavier Jetté, Sam Goroshin, Andrew Higgins, David Frost, Julian Lee; Experimental technique for direct observation of onset of reaction in shocked powder mixtures. AIP Conf. Proc. 29 March 2012; 1426 (1): 426–429. https://doi.org/10.1063/1.3686309
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