Failure in granular materials based on acoustic tensor: a numerical analysis

Giuseppina Recchia, Hongyang Cheng, Vanessa Magnanimo, Luigi La Ragione

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Abstract

We investigate localization in granular material with the support of numerical simulations based upon DEM (Distinct Element Method). Localization is associated with a discontinuity in a component of the incremental strain over a plane surface through the condition of the determinant of the acoustic tensor to be zero. DEM simulations are carried out on an aggregate of elastic frictional spheres, initially isotropically compressed and then sheared at constant pressure p0. The components of the stiffness tensor are evaluated numerically in stressed states along the triaxial test and employed to evaluate the acoustic tensor in order to predict localization. This occurs in the pre-peak region, where the aggregate hardens under the circumstance to be incrementally frictionless: it is a regime in which the tangential force does not change as the deformation proceedes and, consequently, the deviatoric stress varies only with the normal component of the contact force.
Original languageEnglish
Title of host publicationPowders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
DOIs
Publication statusPublished - 7 Jun 2021
Event9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021 - Virtual Conference, Argentina
Duration: 5 Jul 20216 Aug 2021
Conference number: 9
https://www.powdersandgrains.org/

Publication series

NameEPJ Web of Conferences
Volume249

Conference

Conference9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021
Abbreviated titlePowders and Grains 2021
Country/TerritoryArgentina
CityVirtual Conference
Period5/07/216/08/21
Internet address

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