Left-right loading dependence of shock response of (111)//(112) Cu bicrystals: Deformation and spallation

Q An and WZ Han and SN Luo and TC Germann and DL Tonks and WA Goddard, JOURNAL OF APPLIED PHYSICS, 111, 053525 (2012).

DOI: 10.1063/1.3692079

We investigate with molecular dynamics the dynamic response of Cu bicrystals with a special asymmetric grain boundary (GB), (111)//(112) < 110 >, and its dependence on the loading directions. Shock loading is applied along the GB normal either from the left or right to the GB. Due to the structure asymmetry, the bicrystals demonstrate overall strong left-right loading dependence of its shock response, including compression wave features, compression and tensile plasticity, damage characteristics (e. g., spall strength), effective wave speeds and structure changes, except that spallation remains dominated by the GB damage regardless of the loading directions. The presence or absence of transient microtwinning also depends on the loading directions. (C) 2012 American Institute of Physics. http://dx.doi.org/10.1063/1.3692079

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