Experimental validation of a micromechanically-based compaction law for soft/hard grain mixtures

TL;DR

This study experimentally validates a micromechanical compaction law for soft/hard grain mixtures, revealing linear regimes and a transition point, with results applicable to broader polydisperse granular systems.

Contribution

The paper extends and experimentally validates a micromechanical compaction model for soft/hard granular mixtures, identifying transition regimes and the effect of mixture proportions.

Findings

Validation of the compaction model beyond the jamming point

Identification of two linear regimes with a crossover strain

Linear variation of laws with hard particle proportion up to 80%

Abstract

In this letter, we report on an experimental study which analyzes the compressive behavior of 2D bidisperse granular assemblies made of soft (hyperelastic) and hard grains in varying proportions ($\kappa$). By means of a recently developed uniaxial compression set-up \cite{vu2019_pre} and using advanced Digital Image Correlation (DIC) method, we follow, beyond the jamming point, the evolution of the main mechanical observables, from the global scale down to the strain field inside each deformable grain. First, we experimentally validate and extend to the uni-axial case a recently proposed micro-mechanical compaction model linking the evolution of the applied pressure $P$ to the packing fraction $\phi$ \cite{cantor2020_prl}. Second, we reveal two different linear regimes depending on whether the system is above or below a cross-over strain unraveling a transition from a discrete to a continuous-like system. Third, the evolution of these linear laws are found to vary linearly with $\kappa$, up to a saturation point around $\kappa=80$\% of hard particles. These results provide a comprehensive experimental and theoretical framework that can now be extended to a more general class of polydisperse soft granular systems.