We construct a linear response theory of applying shear deformations from boundary walls in the film geometry in Kubo’s theoretical scheme. Our method is applicable to any solids and fluids. For glasses, we assume quasi-equilibrium around a fixed inherent state. Then, we obtain linear-response expressions for any variables including the stress and the particle displacements, even though the glass interior is elastically inhomogeneous. In particular, the shear modulus can be expressed in terms of the correlations between the interior stress and the forces from the walls. It can also be expressed in terms of the inter-particle correlations, as has been shown in the previous literature. Our stress relaxation function includes the effect of the boundary walls and can be used for inhomogeneous flow response. We show the presence of long-ranged, long-lived correlations among the fluctuations of the forces from the walls and the displacements of all the particles in the cell. We confirm these theoretical results numerically in a two-dimensional model glass. As an application, we describe emission and propagation of transverse sounds after boundary wall motions using these time-correlation functions. We also find resonant sound amplification when the frequency of an oscillatory shear approaches that of the first transverse sound mode.
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28 March 2019
Research Article|
March 27 2019
Theory of applying shear strains from boundary walls: Linear response in glasses
Akira Onuki
;
Akira Onuki
1
Department of Physics, Kyoto University
, Kyoto 606-8502, Japan
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Takeshi Kawasaki
Takeshi Kawasaki
2
Department of Physics, Nagoya University
, Nagoya 464-8602, Japan
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J. Chem. Phys. 150, 124504 (2019)
Article history
Received:
November 19 2018
Accepted:
March 04 2019
Citation
Akira Onuki, Takeshi Kawasaki; Theory of applying shear strains from boundary walls: Linear response in glasses. J. Chem. Phys. 28 March 2019; 150 (12): 124504. https://doi.org/10.1063/1.5082154
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