Soft granular matter

TL;DR

This paper investigates how small forces affect soft gel systems with embedded hard particles, proposing methods to visualize deformations caused by these forces.

Contribution

It introduces a theoretical framework for understanding local deformations in soft gels due to embedded particles and suggests visualization techniques.

Findings

Deformation scales with particle weight and gel softness.

Proposes particle image velocimetry (PIV)-like techniques for visualization.

Provides quantitative predictions of deformation patterns.

Abstract

We consider a dilute system of small hard beads or hard fibers immersed in a very soft gel able to withstand large elastic deformations. Because of its low to very low shear modulus, this system is very sensitive to small forces. We calculate the local deformation induced by a constant volume force, the inclusion weight. We explain how this deformation could be put in evidence by using techniques similar to the PIV method (particle image velocimetry) used to show complex velocity fields in transparent fluids.