Mutz, Andrew H. and Vreeland, Thad, Jr. (1993) Thermoelectric measurements of energy deposition during shock-wave consolidation of metal powders of several sizes. Journal of Applied Physics, 73 (10). pp. 4862-4868. ISSN 0021-8979 http://resolver.caltech.edu/CaltechAUTHORS:MUTjap93
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The degree of shock energy localization within individual particles and between neighboring particles of different size was explored during shock-wave consolidation of spherical metal powders. The thermoelectric voltage generated by the passage of a shock wave through a copper powder-constantan powder interface was recorded. The sizes of the copper and constantan powders were varied between mean diameters of 40 and 98 µm. Shock-wave pressures of 5 GPa were applied by flyer plate impact, and the resulting voltage versus time signals were collected with a 10 ns time resolution. In order to analyze the signals, a simulation of the thermocouple system was developed to account for the effects of multiple particle interactions and a slightly nonplanar copper-constantan interface. The resulting simulated voltage versus time signals are a good match for the observed signals when the size ratio of the copper and constantan particles is less than a factor of 2, and reveal the preferential deposition of energy in smaller particles at the expense of larger particles within the size range examined. The amount of energy localized near particle surfaces was found to be a majority of all the energy, with a significant minority deposited throughout the particle bulk.
|Additional Information:||Copyright © 1993 American Institute of Physics (Received 8 April 1992; accepted 19 January 1993)|
|Subject Keywords:||METALS; POWDERS; ENERGY DEPOSITION; SHOCK WAVES; VERY HIGH PRESSURE; THERMOELECTRICITY; TEMPERATURE MEASUREMENT; SEEBECK EFFECT|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Archive Administrator|
|Deposited On:||15 Jun 2006|
|Last Modified:||26 Dec 2012 08:55|
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