Compression-driven jamming in porous cohesive aggregates

Abstract

I investigate the compression-driven jamming behavior of two-dimensional porous aggregates composed of cohesive, frictionless disks. Three types of initial aggregates are prepared using different aggregation procedures, namely, reaction-limited aggregation (RLA), ballistic particle-cluster aggregation (BPCA), and diffusion-limited aggregation (DLA), to elucidate the influence of aggregate morphology. Using distinct-element-method simulations with a shrinking circular boundary, I numerically obtain the pressure as a function of the packing fraction $\varphi$. For the densest RLA and the intermediate BPCA aggregates, a clear jamming transition is observed at a critical packing fraction ${\varphi }_{\mathrm{J}}$, below which the pressure vanishes and above which a finite pressure emerges; the transition is less distinct for the most porous DLA aggregates. The jamming threshold depends on the initial structure and, when extrapolated to infinite system size, approaches ${\varphi }_{\mathrm{J}}=0.765\pm 0.004$ for RLA, $0.727\pm 0.004$ for BPCA, and $0.602\pm 0.023$ for DLA, where the errors denote the standard error. Above ${\varphi }_{\mathrm{J}}$, the pressure follows $P\approx A{(\varphi -{\varphi }_{\mathrm{J}})}^2$, which implies that the bulk modulus $K$ of jammed aggregates is proportional to $\varphi -{\varphi }_{\mathrm{J}}$. Rigid-cluster analysis of jammed aggregates shows that the average coordination number within the largest rigid cluster increases linearly with $\varphi -{\varphi }_{\mathrm{J}}$. Taken together, these relations suggest that the elastic response of compressed porous aggregates is analogous to that of random spring networks.

Accepted for publication in Soft Matter

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