High-Pressure Tailored Compression: Controlled Thermodynamic Paths

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We have recently carried out novel and exploratory dynamic experiments where the sample follows a prescribed thermodynamic path. In typical dynamic compression experiments, the samples are thermodynamically limited to the principal Hugoniot or quasi-isentrope. With recent developments in the functionally graded material impactor, we can prescribe and shape the applied pressure profile with similarly-shaped, non-monotonic impedance profile in the impactor. Previously inaccessible thermodynamic states beyond the quasi-isentropes and Hugoniot can now be reached in dynamic experiments with these impactors. In the light gas-gun experiments on copper reported here, we recorded the particle velocities of the Cu-LiF interfaces and employed hydrodynamic ... continued below

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Nguyen, J H; Orlikowski, D; Streitz, F H; Moriarty, J A & Holmes, N C October 21, 2005.

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We have recently carried out novel and exploratory dynamic experiments where the sample follows a prescribed thermodynamic path. In typical dynamic compression experiments, the samples are thermodynamically limited to the principal Hugoniot or quasi-isentrope. With recent developments in the functionally graded material impactor, we can prescribe and shape the applied pressure profile with similarly-shaped, non-monotonic impedance profile in the impactor. Previously inaccessible thermodynamic states beyond the quasi-isentropes and Hugoniot can now be reached in dynamic experiments with these impactors. In the light gas-gun experiments on copper reported here, we recorded the particle velocities of the Cu-LiF interfaces and employed hydrodynamic simulations to relate them to the thermodynamic phase diagram. Peak pressures for these experiments were on the order of megabars, and the time-scales ranged from nanoseconds to several microseconds. The strain rates of the quasi-isentropic experiments are approximately 10{sup 4} s{sup -1} to 10{sup 6} s{sup -1} in samples with thicknesses up to 5 mm. Though developed at a light-gas gun facility, such shaped pressure-profiles are also feasible in principle with laser ablation or magnetic driven compression techniques allowing for new directions to be taken in high pressure physics.

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PDF-file: 15 pages; size: 0.5 Mbytes

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  • Journal Name: Journal of Applied Physics, N/A, no. 2, July 15, 2006, pp. 023508

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  • Report No.: UCRL-JRNL-216464
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 898044
  • Archival Resource Key: ark:/67531/metadc886767

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 21, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 12:37 p.m.

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Nguyen, J H; Orlikowski, D; Streitz, F H; Moriarty, J A & Holmes, N C. High-Pressure Tailored Compression: Controlled Thermodynamic Paths, article, October 21, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc886767/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.