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Banding and polarization in driven multistable materials.

Sheng Huang¹, Daniel Hexner¹

¹Faculty of Mechanical Engineering, Technion, Haifa 32000, Israel.

The Journal of Chemical Physics

|December 1, 2025

Summary

This summary is machine-generated.

This study reveals how disordered networks behave under periodic strain, showing distinct behaviors at different strain levels. A continuous transition is observed, with instabilities changing from localized to banded patterns.

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Area of Science:

Physics
Materials Science
Complex Systems

Background:

Disordered networks exhibit complex behaviors analogous to glasses, including energy landscapes and memory effects.
Periodic strain applied to these networks can induce unique dynamic responses.
Understanding these responses is crucial for materials with applications in flexible electronics and energy storage.

Purpose of the Study:

To investigate the dynamic response of a disordered network of bistable bonds under periodic strain.
To characterize the transition between different dynamic regimes (limit cycle vs. erratic motion).
To identify the nature of instabilities and propose a new order parameter.

Main Methods:

Computational modeling of a disordered network of bistable bonds.
Application of periodic strain with varying amplitudes.
Analysis of system dynamics, energy landscape, and instability patterns.

Main Results:

At small strain amplitudes, the system converges to a limit cycle.
At large strain amplitudes, the system exhibits erratic motion without convergence.
A continuous transition is observed with diverging timescales and distinct instability behaviors (finite correlation vs. diagonal bands).
A new order parameter, the polarization of instabilities, is proposed for the low-strain regime.

Conclusions:

The study elucidates the distinct dynamic regimes and the nature of the transition in strained disordered networks.
The proposed order parameter offers a new way to understand the system's behavior below the transition.
Findings provide insights into the physics of disordered materials under mechanical stress.