Modeling Dynamic Ductility: An Equation of State for Porous Metals

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Enhanced heating from shock compression of a porous material can potentially suppress or delay cracking of the material on subsequent expansion. In this paper we quantify the expected enhanced heating in an experiment in which a sector of a thin cylindrical shell is driven from the inside surface by SEMTEX high explosive ({approx}1 {micro}s FWHM pressure pulse with peak pressure {approx}21.5 GPa). We first derive an analytical equation of state (EOS) for porous metals, then discuss the coupling of this EOS with material elastic-plastic response in a 2D hydrocode, and then discuss the modeling of the HE experiment with both ... continued below

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Colvin, J July 27, 2007.

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Enhanced heating from shock compression of a porous material can potentially suppress or delay cracking of the material on subsequent expansion. In this paper we quantify the expected enhanced heating in an experiment in which a sector of a thin cylindrical shell is driven from the inside surface by SEMTEX high explosive ({approx}1 {micro}s FWHM pressure pulse with peak pressure {approx}21.5 GPa). We first derive an analytical equation of state (EOS) for porous metals, then discuss the coupling of this EOS with material elastic-plastic response in a 2D hydrocode, and then discuss the modeling of the HE experiment with both fully dense and 10% porous Ta and a Bi/Ta composite. Finally, we compare our modeling with some recent experimental data.

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PDF-file: 6 pages; size: 4.2 Mbytes

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  • Presented at: American Physical Society Topical Conference on Shock Compression of Condensed Matter (APS/SCCM), Kohala Coast, HI, United States, Jun 25 - Jun 29, 2007

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  • Report No.: UCRL-CONF-233170
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 921169
  • Archival Resource Key: ark:/67531/metadc898482

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  • July 27, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 8:20 p.m.

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Colvin, J. Modeling Dynamic Ductility: An Equation of State for Porous Metals, article, July 27, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc898482/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.