Molecular dynamics simulation of materials response to high strain-rate loading

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A molecular dynamics (MD) analysis of conservation of momentum through a shock front is presented. The MD model uses a non-traditional boundary condition that allows simulation in the reference frame of the shock front. Higher order terms proportional to gradients in the density are shown to be non-negligible at the shock front. The simulation is used to study the sequence of thermodynamic states during shock loading. Melting is observed in the simulations, though above the thermodynamic melt curve as is common in homogeneous simulations of melting. High strain-rate tensile loading is applied to the growth of nanoscale voids in copper. ... continued below

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988 Kilobytes pages

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Belak, J July 22, 1999.

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A molecular dynamics (MD) analysis of conservation of momentum through a shock front is presented. The MD model uses a non-traditional boundary condition that allows simulation in the reference frame of the shock front. Higher order terms proportional to gradients in the density are shown to be non-negligible at the shock front. The simulation is used to study the sequence of thermodynamic states during shock loading. Melting is observed in the simulations, though above the thermodynamic melt curve as is common in homogeneous simulations of melting. High strain-rate tensile loading is applied to the growth of nanoscale voids in copper. Void growth is found to occur by plasticity mechanisms with dislocations emerging from the void surface. [molecular dynamics, shock loading, conservation of momentum, shock melting, void growth]

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988 Kilobytes pages

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  • International Conference on High Pressure Science and Technology, Honolulu, HI (US), 07/25/1999--07/30/1999

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  • Report No.: UCRL-JC-133964
  • Report No.: DP0101031
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 13797
  • Archival Resource Key: ark:/67531/metadc626516

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  • July 22, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 2:48 p.m.

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Belak, J. Molecular dynamics simulation of materials response to high strain-rate loading, article, July 22, 1999; California. (digital.library.unt.edu/ark:/67531/metadc626516/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.