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国际多尺度计算工程期刊

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ISSN 打印: 1543-1649

ISSN 在线: 1940-4352

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DETERMINATION OF NONLOCAL CONSTITUTIVE EQUATIONS FROM PHONON DISPERSION RELATIONS

卷 9, 册 6, 2011, pp. 623-634
DOI: 10.1615/IntJMultCompEng.2011002688
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摘要

All materials exhibit wave dispersion at "small" wavelengths leading to non-linearities in experimentally determined dispersion curves. Classical local elasticity fails to predict these non-linearities. Nonlocal continuum mechanics allows for the prediction of the elastic behavior over a considerably wider range of lengthscales. Starting from ab initio lattice dynamics calculations we determine the elastic constants and the phonon dispersion relation for silicon. We verify our results using inelastic neutron scattering data. Next we develop the theoretical and numerical framework to construct nonlocal constitutive equations for longitudinal and transverse acoustic modes.

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