An outstanding challenge in developing a complete equation of state for materials at elevated pressure and temperature is a robust method of determining the bulk temperature state under dynamic conditions. In metals, the determination of bulk temperature states by optical pyrometry is complicated by the small optical depth and thermal conduction effects. These effects lead to observed temperatures differing by 20% or more from the bulk temperature state. In this work, we show the presence of thermal conduction effects in temperature measurements of tin and iron coatings during dynamic compression experiments. We demonstrate that tin, in contrast to iron, coatings can fail to converge to a bulk temperature source over the time scale of the experiment, requiring the experimenter to modify assumptions, design, or analysis. This work bounds thermal transport at shocked conditions.
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7 January 2021
Research Article|
January 05 2021
Comparing temperature convergence of shocked thin films of tin and iron to a bulk temperature source
David A. Brantley
;
David A. Brantley
a)
Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
a)Author to whom correspondence should be addressed: brantley3@llnl.gov
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Ryan S. Crum;
Ryan S. Crum
Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
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Minta C. Akin
Minta C. Akin
Lawrence Livermore National Laboratory
, Livermore, California 94550, USA
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a)Author to whom correspondence should be addressed: brantley3@llnl.gov
J. Appl. Phys. 129, 015903 (2021)
Article history
Received:
August 21 2020
Accepted:
December 10 2020
Citation
David A. Brantley, Ryan S. Crum, Minta C. Akin; Comparing temperature convergence of shocked thin films of tin and iron to a bulk temperature source. J. Appl. Phys. 7 January 2021; 129 (1): 015903. https://doi.org/10.1063/5.0026053
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