Measuring and upscaling micromechanical interactions in a cohesive granular material

Hemmerle, A., Yamaguchi, Y., Makowski, M., Bäumchen, O. and Goehring, L. ORCID: 0000-0002-3858-7295, 2021. Measuring and upscaling micromechanical interactions in a cohesive granular material. Soft Matter, 17 (23), pp. 5806-5814. ISSN 1744-683X

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Abstract

The mechanical properties of a disordered heterogeneous medium depend, in general, on a complex interplay between multiple length scales. Connecting local interactions to macroscopic observables, such as stiffness or fracture, is thus challenging in this type of material. Here, we study the properties of a cohesive granular material composed of glass beads held together by soft polymer bridges. We characterise the mechanical response of single bridges under traction and shear, using a setup based on the deflection of flexible micropipettes. These measurements, along with information from X-ray microtomograms of the granular packings, then inform large-scale discrete element model (DEM) simulations. Although simple, these simulations are constrained in every way by empirical measurement and accurately predict mechanical responses of the aggregates, including details on their compressive failure, and how the material's stiffness depends on the stiffness and geometry of its parts. By demonstrating how to accurately relate microscopic information to macroscopic properties, these results provide new perspectives for predicting the behaviour of complex disordered materials, such as porous rock, snow, or foam.

Item Type: Journal article
Publication Title: Soft Matter
Creators: Hemmerle, A., Yamaguchi, Y., Makowski, M., Bäumchen, O. and Goehring, L.
Publisher: Royal Society of Chemistry (RSC)
Date: 21 June 2021
Volume: 17
Number: 23
ISSN: 1744-683X
Identifiers:
NumberType
10.1039/d1sm00458aDOI
1446312Other
Rights: © The Royal Society of Chemistry 2021. RSC Read and Publish agreement with NTU. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/).
Divisions: Schools > School of Science and Technology
Record created by: Lee Houghton
Date Added: 17 Jun 2021 10:25
Last Modified: 17 Jun 2021 10:25
URI: http://irep.ntu.ac.uk/id/eprint/43111

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