Network topology in soft gels: hardening and softening materials

TL;DR

This study uses 3D simulations to explore how the network topology in soft gels influences their nonlinear mechanical behavior, revealing how connectivity can tune responses from softening to hardening and brittleness.

Contribution

It demonstrates the direct link between network topology and large-strain mechanical responses in soft gels, offering insights for designing smart materials.

Findings

Network connectivity can induce strain-softening, hardening, or brittleness.

Topology controls the nonlinear rheological response before yielding.

Insights aid in designing materials with tailored mechanical properties.

Abstract

The structural complexity of soft gels is at the origin of a versatile mechanical response that allows for large deformations, controlled elastic recovery and toughness in the same material. A limit to exploiting the potential of such materials is the insufficient fundamental understanding of the microstructural origin of the bulk mechanical properties. Here we investigate the role of the network topology in a model gel through 3D numerical simulations. Our study links the topology of the network organization in space to its non-linear rheological response preceding yielding and damage: our analysis elucidates how the network connectivity alone could be used to modify the gel mechanics at large strains, from strain-softening to hardening and even to a brittle response. These findings provide new insight for smart material design and for understanding the non-trivial mechanical response of a potentially wide range of technologically relevant materials.