Micromechanics of contact-bound cohesive granular materials in confined compression

Bhat K I, M and Hurley, RC and Murthy, TG (2024) Micromechanics of contact-bound cohesive granular materials in confined compression. In: Physical Review E, 109 (5).

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Abstract

The mechanical behavior of granular materials results from interparticle interactions, which are predominantly frictional. With the presence of even very small amounts of cohesion this frictional interparticle behavior significantly changes. In this study, we introduce trace amounts of cohesive binder between the intergranular contacts in a sample of quartz particles and apply one-dimensional (1D) compression loading. X-ray computed tomography is performed in situ during 1D compression. We make observations at three different length scales. At the macroscopic or ensemble scale, we track the evolution of the porosity, particle size and the stress-strain response during this compression. At the microstructure or interparticle scale, we compute the directional distribution of contacts and the particles. We also track the evolution of the fabric chains with continued compression. We also evaluate particle rotations, displacements, contact twist, rotation, and sliding. We show through our experiments that even a small amount of cohesion (as low as 1 by weight) significantly changes the response at multiple length scales. This interparticle cohesion suppresses the fragmentation of grains, alters force transmission and changes the structure of the ensemble. © 2024 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review E
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to American Physical Society
Keywords:	Association reactions; Computerized tomography; Friction; Particle size; Textures, Compression loading; Confined compression; Inter-particle interaction; Intergranular contacts; Interparticles; Mechanical behavior; One-dimensional; Quartz particles; Trace amounts; X-ray computed tomography, Granular materials
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	29 Jul 2024 05:09
Last Modified:	29 Jul 2024 05:09
URI:	http://eprints.iisc.ac.in/id/eprint/85188

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