Stress Fluctuations in Glass‐Forming Systems: Elastic Response and Long‐Range Correlations - Archive ouverte HAL
Article Dans Une Revue Macromolecular Symposia Année : 2022

Stress Fluctuations in Glass‐Forming Systems: Elastic Response and Long‐Range Correlations

Liudmyla Klochko
Jorg Baschnagel
Joachim Wittmer
Alexander Semenov

Résumé

The dynamics of two model glass-formers (3D oligomer melt and 2D polydisperse colloidal system) are analyzed using MD simulations. It is found that the standard deviation of the shear modulus shows a striking peak near the glass transition T g , which is explained with a quantitative theory. The simulation data well below T g suggest that static multi-point correlations of local stress are long-range. The obtained correlation functions of time-dependent and wavevector-resolved stress for the 2D system are in excellent agreement with the developed theory indicating that the frozen-in stress inhomogeneities in the glassy state are correlated according to a power law.
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Dates et versions

hal-03839795 , version 1 (04-11-2022)

Identifiants

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Liudmyla Klochko, Jorg Baschnagel, Joachim Wittmer, Alexander Semenov. Stress Fluctuations in Glass‐Forming Systems: Elastic Response and Long‐Range Correlations. Macromolecular Symposia, 2022, 405 (1), pp.2100215. ⟨10.1002/masy.202100215⟩. ⟨hal-03839795⟩
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