Failure processes of cemented granular materials

Yamaguchi, Y., Biswas, S., Hatano, T. and Goehring, L. ORCID: 0000-0002-3858-7295, 2020. Failure processes of cemented granular materials. Physical Review E, 102 (5): 052903. ISSN 2470-0045

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The mechanics of cohesive or cemented granular materials is complex, combining the heterogeneous responses of granular media, like force chains, with clearly defined material properties. Here, we use a discrete element model (DEM) simulation, consisting of an assemblage of elastic particles connected by softer but breakable elastic bonds, to explore how this class of material deforms and fails under uniaxial compression. We are particularly interested in the connection between the microscopic interactions among the grains or particles and the macroscopic material response. To this end, the properties of the particles and the stiffness of the bonds are matched to experimental measurements of a cohesive granular media with tunable elasticity. The criterion for breaking a bond is also based on an explicit Griffith energy balance, with realistic surface energies. By varying the initial volume fraction of the particle assembles we show that this simple model reproduces a wide range of experimental behaviors, both in the elastic limit and beyond it. These include quantitative details of the distinct failure modes of shear-banding, ductile failure and compaction banding or anti-cracks, as well as the transitions between these modes. The present work, therefore, provides a unified framework for understanding the failure of porous materials such as sandstone, marble, powder aggregates, snow and foam.

Item Type: Journal article
Publication Title: Physical Review E
Creators: Yamaguchi, Y., Biswas, S., Hatano, T. and Goehring, L.
Publisher: American Physical Society (APS)
Date: 13 November 2020
Volume: 102
Number: 5
ISSN: 2470-0045
Rights: ©2020 American Physical Society.
Divisions: Schools > School of Science and Technology
Record created by: Linda Sullivan
Date Added: 17 Nov 2020 10:58
Last Modified: 31 May 2021 15:13

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