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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

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Thermally activated intermittent flow in amorphous solids.

Daniel James Korchinski¹, Jörg Rottler¹

¹Department of Physics and Astronomy and Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC V6T 1Z1, Canada. djkorchi@phas.ubc.ca.

|September 25, 2024

Summary

This study reveals that standard rheological flow laws for amorphous solids break down under intermittent flow conditions. A new thermal activation stress scale governs flow behavior in this regime, necessitating a re-evaluation of slow shearing effects.

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Area of Science:

Condensed Matter Physics
Materials Science
Rheology

Background:

Amorphous solids exhibit complex flow behavior under shear.
Existing rheological models often assume continuous flow, which may not apply universally.

Purpose of the Study:

To analyze the steady-state shear rheology of amorphous solids, particularly focusing on thermally activated processes.
To identify how rheological flow laws change in the intermittent flow regime.

Main Methods:

Application of mean field theory.
Utilizing a mesoscale elastoplastic model.
Analysis of thermally activated amorphous solids under shear.

Main Results:

Continuous flow is described by established laws (e.g., Herschel-Bulkley) at high temperatures and driving rates.
Intermittent flow, characterized by serrated behavior, requires a revised understanding.
A thermal activation stress scale, x_a(T, γ̇), unifies the effects of temperature and driving rate on flow stress and event sizes.

Conclusions:

Standard rheological laws are insufficient for intermittent flow in amorphous solids.
The identified thermal activation stress scale provides a universal descriptor for this regime.
Further investigation into the rheology of slowly sheared amorphous matter below the glass transition is warranted.