Rotationssymmetrisches ebenes Flie�en eines granularen Modellmaterials

Bogdanova-Bontcheva, N.; Lippmann, H.

doi:10.1007/bf01172830

Cited by 40 publications

(9 citation statements)

References 14 publications

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“…Significant grain rotations, accompanied by dilatancy, are observed within the interfacial layer for both CPS (Fig.3b, 3c) and CVS (Fig.4b, 4c). This matches the experimental observations of Bogdanova- Bontcheva and Lippmann (1975), Löffelmann (1989) and Kashida and Uesugi (1987). As deformation localizes, Cosserat rotation almost stops developing outside the interfacial layer.…”

Section: Development Of Interfacial Layersupporting

confidence: 91%

Behaviour of interfacial layer along granular soil-structure interfaces

Huang¹,

Bauer²,

Sloan³

2003

Structural Engineering and Mechanics

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As shear occurs along a soil-structure interface, a localized zone with a thickness of several grain diameters will develop in soil along the interface, forming an interfacial layer. In this paper, the behaviour of a soil-structure interface is studied numerically by modelling the plane shear of a granular layer bounded by rigid plates. The mechanical behaviour of the granular material is described with a micro-polar hypoplastic continuum model. Numerical results are presented to show the development of shear localization along the interface for shearing under conditions of constant normal pressure and constant volume, respectively. Evolution of the resistance on the surface of the bounding plate is considered with respect to the influences of grain rotation.

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Section: Development Of Interfacial Layersupporting

confidence: 91%

Behaviour of interfacial layer along granular soil-structure interfaces

Huang¹,

Bauer²,

Sloan³

2003

Structural Engineering and Mechanics

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“…References [1][2][3]). Within the localized zones, very sharp strain gradients, pronounced volume changes, strain softening and discrete particle rotations can be observed [4,5].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations of shear localization in a micro‐polar hypoplastic material

Huang¹,

Bauer²

2003

Num Anal Meth Geomechanics

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SUMMARYIn this paper a micro-polar continuum approach is proposed to model the essential properties of cohesionless granular materials like sand. The model takes into account the influence of particle rotations, the mean grain size, the void ratio, the stresses and couple stresses. The constitutive equations for the stresses and couple stresses are incrementally non-linear and based on the concept of hypoplasticity. For plane strain problems the implementation of the model in a finite element program is described. Numerical studies of the evolution of micro-polar effects within a granular strip under plane shearing are presented. It is shown that the location and evolution of shear localization is strongly influenced by the initial state and the micro-polar boundary conditions. For large shearing the state quantities tend towards a stationary state for which a certain coupling between the norm of the stress deviator and the norm of the couple stress tensor can be derived.

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“…The use of the Cosserat continuum allows describing phenomena that run at the level of individual grains, such as shear-bands occurring within granular bodies [27] or interfacial bands, occurring at shear interfaces between hard, coherent material and granular material [5,39,43]. Considering the complex behaviour exhibited by fully developed shear-bands [41,16] and based on a number of studies [9,28,2], Vardoulakis [42] proposed the idea of the post-failure activation of a rolling-contact yield mechanism as the main mechanism for strength softening and energy dissipation.…”

Section: Take Down Policymentioning

confidence: 99%

“…(2) l k (5) therefore the relative rotation and relative velocity of grain (2) with respect to grain (1) at the contact point are…”

Section: Grain Contact Energeticsmentioning

confidence: 99%

Sliding and rolling dissipation in Cosserat plasticity

Papanicolopulos

Veveakis

2011

Granular Matter

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Based on micromechanical considerations at the level of grain contacts and taking into account the way in which kinematic and static quantities are "transported" between grain surface and grain centre, we identify appropriate measures related to energy dissipation due to rolling and sliding between grains, within both a discrete and a Cosserat continuum description. This allows us, within the framework of Cosserat plasticity, to identify appropriate invariants and formulate simple forms of the respective yield surfaces. The resulting model is shown to be a multiple-yield-surface generalisation of the model by Mühlhaus and Vardoulakis (Géotechnique, 1987). By introducing separate and clearly identified rolling-and sliding-resistance parameters, the model allows for separate activation of the respective dissipative mechanisms. Keywords Cosserat continuum • plasticity • granular micromechanics • sliding • rolling • energy dissipation 1 Introduction When describing a granular medium, we usually associate each particle with its centre. It is clear, however, that it is at the contacts between particles that all interesting phenomena take place. As stated by Cole & Peters [9] ".. . the relationship between the contact motions and resisting forces define the micro-scale properties of the medium". The contact between particles may include both sliding and rolling. Earlier studies of granular media silently assumed that almost all energy dissipation takes place at slid-ERC grant agreement n o 228051

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Rotationssymmetrisches ebenes Flie�en eines granularen Modellmaterials

Cited by 40 publications

References 14 publications

Behaviour of interfacial layer along granular soil-structure interfaces

Behaviour of interfacial layer along granular soil-structure interfaces

Numerical investigations of shear localization in a micro‐polar hypoplastic material

Sliding and rolling dissipation in Cosserat plasticity

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