A cohesive granular material with tunable elasticity

Hemmerle, A., Schröter, M. and Goehring, L. ORCID: 0000-0002-3858-7295, 2016. A cohesive granular material with tunable elasticity. Scientific Reports, 6, p. 35650. ISSN 2045-2322

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By mixing glass beads with a curable polymer we create a well-defined cohesive granular medium, held together by solidified, and hence elastic, capillary bridges. This material has a geometry similar to a wet packing of beads, but with an additional control over the elasticity of the bonds holding the particles together. We show that its mechanical response can be varied over several orders of magnitude by adjusting the size and stiffness of the bridges, and the size of the particles. We also investigate its mechanism of failure under unconfined uniaxial compression in combination with in situ x-ray
microtomography. We show that a broad linear-elastic regime ends at a limiting strain of about 8%, whatever the stiffness of the agglomerate, which corresponds to the beginning of shear failure. The possibility to finely tune the stiffness, size and shape of this simple material makes it an ideal model system for investigations on, for example, fracturing of porous rocks, seismology, or root growth in cohesive porous media.

Item Type: Journal article
Publication Title: Scientific Reports
Creators: Hemmerle, A., Schröter, M. and Goehring, L.
Publisher: Springer Nature
Date: 24 October 2016
Volume: 6
ISSN: 2045-2322
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. © The Author(s) 2016.
Divisions: Schools > School of Science and Technology
Record created by: Jill Tomkinson
Date Added: 27 Oct 2016 11:31
Last Modified: 09 Jun 2017 14:07
URI: https://irep.ntu.ac.uk/id/eprint/28963

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