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Related Experiment Video

Updated: Jun 2, 2026

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Linear response theory for hard and soft glassy materials.

Eran Bouchbinder¹, J S Langer

¹Chemical Physics Department, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters

|May 13, 2011

Summary

Hard and soft glassy materials show similar rheological behaviors due to a shear-transformation-zone theory. This theory incorporates thermal-activation barriers, explaining universal properties observed in experiments.

Area of Science:

Materials Science
Condensed Matter Physics
Rheology

Background:

Hard and soft glassy materials display similar linear rheological behaviors despite differing physics.
Understanding the universal properties of these materials is crucial for materials science and condensed matter physics.

Purpose of the Study:

To explain the nearly universal linear rheological behaviors observed in both hard and soft glassy materials.
To extend the shear-transformation-zone theory to incorporate thermal-activation barriers and predict material properties.

Main Methods:

Utilized a shear-transformation-zone theory of amorphous plasticity.
Extended the theory to include a broad distribution of internal thermal-activation barriers.
Employed nonequilibrium, effective-temperature thermodynamics to predict barrier-height distributions.

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Main Results:

The extended shear-transformation-zone theory naturally explains the universal rheological properties.
The theory predicts a loss modulus G''(ω) with a peak at the alpha relaxation rate.
A power law decay of the form ω(-ζ) was predicted for higher frequencies, matching experimental data.

Conclusions:

The proposed theoretical framework successfully unifies the understanding of hard and soft glassy material rheology.
The findings provide a quantitative agreement with experimental observations, validating the role of thermal-activation barriers.