Atomistic modeling of shock-induced void collapse in copper

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Nonequilibrium molecular dynamics (MD) simulations show that shock-induced void collapse in copper occurs by emission of shear loops. These loops carry away the vacancies which comprise the void. The growth of the loops continues even after they collide and form sessile junctions, creating a hardened region around the collapsing void. The scenario seen in our simulations differs from current models that assume that prismatic loop emission is responsible for void collapse. We propose a new dislocation-based model that gives excellent agreement with the stress threshold found in the MD simulations for void collapse as a function of void radius.

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Davila, L P; Erhart, P; Bringa, E M; Meyers, M A; Lubarda, V A; Schneider, M S et al. March 9, 2005.

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Nonequilibrium molecular dynamics (MD) simulations show that shock-induced void collapse in copper occurs by emission of shear loops. These loops carry away the vacancies which comprise the void. The growth of the loops continues even after they collide and form sessile junctions, creating a hardened region around the collapsing void. The scenario seen in our simulations differs from current models that assume that prismatic loop emission is responsible for void collapse. We propose a new dislocation-based model that gives excellent agreement with the stress threshold found in the MD simulations for void collapse as a function of void radius.

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PDF-file: 13 pages; size: 0.8 Mbytes

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  • Journal Name: Applied Physics Letters, vol. 86, N/A, April 18, 2005, pp. 1619021-1619023

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  • Report No.: UCRL-JRNL-210851
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 897980
  • Archival Resource Key: ark:/67531/metadc888677

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  • March 9, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 8, 2016, 2:29 p.m.

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Davila, L P; Erhart, P; Bringa, E M; Meyers, M A; Lubarda, V A; Schneider, M S et al. Atomistic modeling of shock-induced void collapse in copper, article, March 9, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc888677/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.