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Related Experiment Video

Updated: Jun 10, 2025

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Memory of shear flow in soft jammed materials.

H A Vinutha¹, Manon Marchand², Marco Caggioni³

¹Department of Physics, Institute for Soft Matter Synthesis and Metrology, Georgetown University, Washington, DC, USA.

|October 17, 2024

Summary

Yield stress fluids exhibit memory effects due to flow-induced particle rearrangements. These changes in particle motion and packing during flow dictate how the fluid relaxes and retains stress after flow stops.

Keywords:

correlated dynamics flow cessation memory of flow soft jammed materials yield stress fluid

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Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering

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Published on: February 6, 2014

Area of Science:

Rheology
Soft Matter Physics
Computational Materials Science

Background:

Yield stress fluids exhibit a memory effect where prior flow conditions influence subsequent stress relaxation.
Understanding the microscopic origins of this memory is crucial for predicting fluid behavior.

Purpose of the Study:

To investigate the microscopic mechanisms behind the memory effect in yield stress fluids.
To link flow conditions to stress relaxation dynamics and residual stress magnitudes.

Main Methods:

Combined experimental techniques with large-scale computer simulations.
Studied jammed suspensions of soft repulsive particles.
Performed spatiotemporal analysis of particle motion.

Main Results:

Flow induces spatially correlated nonaffine displacements, forming domains that store stress imbalance information.
Particle packing reorganizes to minimize flow resistance, contributing to stress relaxation.
A correlation exists between particle displacement patterns during flow and upon cessation.

Conclusions:

Flow acts as a 'training' process, encoding information in particle displacements and packing.
This encoded memory governs the stress relaxation and residual stress in yield stress fluids.
The study reveals the microscopic basis for memory phenomena in these complex fluids.