Surface eigen-displacement and surface Poisson's ratios of solids
TY Zhang and H Ren and ZJ Wang and S Sun, ACTA MATERIALIA, 59, 4437-4447 (2011).
Theoretical analysis and molecular dynamics simulations were conducted to study systematically surface eigen-displacement and surface Poisson's ratios of solids, which play essential roles in surface energy, surface strain and surface stress. Face-centered cubic (0 0 1) Au thin films were taken as typical examples to illustrate the physical picture. The surface eigen-displacement is a critical surface strain at the equilibrium state after normal relaxation and thus an intrinsic surface property. Surface Poisson's ratios are also intrinsic surface properties. Combining surface eigen-displacement and surface Poisson's ratios with surface eigen-stress and surface tangential elastic constants lays foundations of surface elasticity of solids. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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