Anisotropic stress correlations in two-dimensional liquids
Abstract
In this paper we demonstrate the presence of anisotropic stress correlations in the simulated 2D liquids. Whereas the temporal correlation of macroscopic shear stress is known to contribute to viscosity via the Green-Kubo formula, the general question regarding angular dependence of the spatial correlation among atomic level stresses in liquids without external shear has not been explored. Besides the apparent anisotropicity with well-defined symmetry, we found that the characteristic length of shear stress correlation depends on temperature and follows the power law, suggesting divergence around the glass transition temperature. The anisotropy of the stress correlations can be explained in terms of the inclusion model by Eshelby, based upon which we suggest that the mismatch between the atom and its nearest neighbor cage produces the atomic level stress as well as the long-range stress fields.
- Authors:
-
- Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. of Neutron Science and Dept. of Physics and Astronomy
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. of Neutron Science and Dept. of Physics and Astronomy; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1185850
- Alternate Identifier(s):
- OSTI ID: 1180869
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
- Additional Journal Information:
- Journal Volume: 91; Journal Issue: 3; Journal ID: ISSN 1539-3755
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Liquids
Citation Formats
Wu, Bin, Iwashita, Takuya, and Egami, Takeshi. Anisotropic stress correlations in two-dimensional liquids. United States: N. p., 2015.
Web. doi:10.1103/PhysRevE.91.032301.
Wu, Bin, Iwashita, Takuya, & Egami, Takeshi. Anisotropic stress correlations in two-dimensional liquids. United States. https://doi.org/10.1103/PhysRevE.91.032301
Wu, Bin, Iwashita, Takuya, and Egami, Takeshi. Sun .
"Anisotropic stress correlations in two-dimensional liquids". United States. https://doi.org/10.1103/PhysRevE.91.032301. https://www.osti.gov/servlets/purl/1185850.
@article{osti_1185850,
title = {Anisotropic stress correlations in two-dimensional liquids},
author = {Wu, Bin and Iwashita, Takuya and Egami, Takeshi},
abstractNote = {In this paper we demonstrate the presence of anisotropic stress correlations in the simulated 2D liquids. Whereas the temporal correlation of macroscopic shear stress is known to contribute to viscosity via the Green-Kubo formula, the general question regarding angular dependence of the spatial correlation among atomic level stresses in liquids without external shear has not been explored. Besides the apparent anisotropicity with well-defined symmetry, we found that the characteristic length of shear stress correlation depends on temperature and follows the power law, suggesting divergence around the glass transition temperature. The anisotropy of the stress correlations can be explained in terms of the inclusion model by Eshelby, based upon which we suggest that the mismatch between the atom and its nearest neighbor cage produces the atomic level stress as well as the long-range stress fields.},
doi = {10.1103/PhysRevE.91.032301},
journal = {Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics},
number = 3,
volume = 91,
place = {United States},
year = {Sun Mar 01 00:00:00 EST 2015},
month = {Sun Mar 01 00:00:00 EST 2015}
}
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