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Granular Matter

, Volume 15, Issue 2, pp 221–235 | Cite as

Micromechanical analysis of second order work in granular media

  • Nejib HaddaEmail author
  • François Nicot
  • Franck Bourrier
  • Luc Sibille
  • Farhang Radjai
  • Félix Darve
Original Paper

Abstract

This paper examines instabilities in granular materials from a microscopic point of view through numerical simulations conducted using a discrete element method on two three-dimensional specimens. The detection and the tracking of grain scale deformation mechanisms constitute the key point for a better understanding the failure process and puzzling out what lies behind the vanishing of the macroscopic second order work. For this purpose, the second order work from microscopic variables, involving contact force and branch vector, was introduced and tracked numerically. Then, all contacts depicting negative values of the second order work were deeply investigated, especially their spatial distribution (homogeneity, agglomeration, dispersion\(\ldots \)) within the specimen according to the density of the granular assembly and to the loading direction. A set of comparisons has been considered in this context in order to highlight how a specimen is populated with such contacts whether it is loaded along a direction included within the plastic tensorial zone or along a direction for which the specimen is likely to behave elastically (elastic tensorial zone). Moreover, these comparisons concerned also loading directions within the cone of instability so that links between the vanishing of both microscopic and macroscopic second order works can be established and the local mechanisms responsible for failure occurrence may be figured out.

Keywords

Microscopic variables Grain scale Second order work Granular material Discrete element method Homogeneity Spatial distribution Instability 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Nejib Hadda
    • 1
    Email author
  • François Nicot
    • 1
  • Franck Bourrier
    • 1
  • Luc Sibille
    • 2
  • Farhang Radjai
    • 3
  • Félix Darve
    • 4
  1. 1.IrsteaGrenobleFrance
  2. 2.Institut de Recherche en Génie Civil et Mécanique CNRS, LUNAM UniversitéNantesFrance
  3. 3.Laboratoire de Mécanique et de Génie CivilUniversité de MontpellierMontpellierFrance
  4. 4.Laboratoire Sols Solides Structures RisquesUJF-INPG-CNRSGrenobleFrance

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