# Soft grain compression: beyond the jamming point

## TL;DR

This study investigates the behavior of highly strained soft granular systems beyond the jamming point, revealing a material-dependent crossover in local strain behavior using detailed experimental measurements.

## Contribution

It provides new experimental insights into the deep jammed state of soft granular matter, emphasizing the role of local strain fields across different materials.

## Key findings

- Identification of a crossover in material behavior deep in the jammed state
- Strain field as a reliable observable for jamming transition analysis
- Material-dependent variations in local strain statistics

## Abstract

We present the experimental studies of highly strained soft bidisperse granular systems made of hyperelastic and plastic particles. We explore the behavior of granular matter deep in the jammed state from local field measurement from the grain scale to the global scale. By mean of digital image correlation and accurate image recording we measure for each compression step the evolution of the particle geometries and their right Cauchy-Green strain tensor fields. We analyze the evolution of the usual macroscopic observables (stress, packing fraction, coordination, fraction of non-rattlers, \textit{etc}.) along the compression process through the jamming point and far beyond. We also analyze the evolution of the local strain statistics and evidence a crossover in the material behavior deep in the jammed state. We show that this crossover depends on the particle material. We argue that the strain field is a reliable observable to describe the evolution of a granular system through the jamming transition and deep in the dense packing state whatever is the material behavior.