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Updated: May 10, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Heterogeneous relaxation dynamics in amorphous materials under cyclic loading.

Nikolai V Priezjev¹

¹Department of Mechanical Engineering, Michigan State University, East Lansing, Michigan 48824, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|June 18, 2013

Summary

This study uses molecular dynamics to explore how amorphous glassy materials deform under shear strain. Increased strain amplitude leads to particle clustering and dynamic facilitation, revealing complex material behavior.

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Area of Science:

Condensed Matter Physics
Materials Science
Computational Chemistry

Background:

Amorphous glassy materials exhibit complex dynamics, particularly under external stress.
Understanding heterogeneous dynamics is crucial for predicting material properties and failure.
Oscillatory shear strain is a common method to probe material response.

Purpose of the Study:

To investigate heterogeneous dynamics in amorphous glassy materials under oscillatory shear strain.
To quantify structural relaxation and dynamical heterogeneity.
To analyze the effect of strain amplitude on particle mobility and clustering.

Main Methods:

Three-dimensional binary Lennard-Jones mixture simulations below the glass transition temperature.
Quantification using self-overlap order parameter and dynamic susceptibility.
Analysis of mean square displacement, particle hopping, and dynamic facilitation.

Main Results:

At low strain amplitudes, materials show subdiffusive behavior and reversible deformation.
Higher strain amplitudes induce a transition to diffusive regimes with intermittent particle displacements.
Mobile particles form clusters that grow with increasing strain amplitude.
Dynamic facilitation becomes more pronounced at larger strain amplitudes.

Conclusions:

Oscillatory shear strain significantly alters dynamics in amorphous glasses.
Strain amplitude controls the transition from reversible to irreversible deformation.
Particle clustering and dynamic facilitation are key mechanisms governing material response under stress.