Specifically Prescribed Dynamic Thermodynamic Paths and Resolidification Experiments

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We describe here a series of dynamic compression experiments using impactors with specifically prescribed density profiles. Building upon previous impactor designs, we compose our functionally graded density impactors of materials whose densities vary from about 0.1 g/cc to more than 15 g/cc. These impactors, whose density profiles are not restricted to be monotonic, can be used to generate prescribed thermodynamic paths in the targets. These paths include quasi-isentropes as well as combinations of shock, rarefraction, and quasi-isentropic compression waves. The time-scale of these experiments ranges from nanoseconds to several microseconds. Strain-rates in the quasi-isentropic compression experiments vary from approximately 10{sup ... continued below

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Nguyen, J; Orlikowski, D; Streitz, F; Holmes, N & Moriarty, J November 19, 2003.

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We describe here a series of dynamic compression experiments using impactors with specifically prescribed density profiles. Building upon previous impactor designs, we compose our functionally graded density impactors of materials whose densities vary from about 0.1 g/cc to more than 15 g/cc. These impactors, whose density profiles are not restricted to be monotonic, can be used to generate prescribed thermodynamic paths in the targets. These paths include quasi-isentropes as well as combinations of shock, rarefraction, and quasi-isentropic compression waves. The time-scale of these experiments ranges from nanoseconds to several microseconds. Strain-rates in the quasi-isentropic compression experiments vary from approximately 10{sup 4}s{sup -1} to 10{sup 6}s{sup -1}. We applied this quasi-isentropic compression technique to resolidify water where ice is at a higher temperature than the initial water sample. The particle velocity of quasi-isentropically compressed water exhibits a two-wave structure and sample thickness scales consistently with water-ice phase transition time. Experiments on resolidification of molten bismuth are also promising.

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PDF-file: 8 pages; size: 0.6 Mbytes

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  • Journal Name: Shock Compression of Condensed Matter

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  • Report No.: UCRL-JRNL-201169
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 883825
  • Archival Resource Key: ark:/67531/metadc875473

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  • November 19, 2003

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 12:25 p.m.

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Nguyen, J; Orlikowski, D; Streitz, F; Holmes, N & Moriarty, J. Specifically Prescribed Dynamic Thermodynamic Paths and Resolidification Experiments, article, November 19, 2003; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc875473/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.