A micro finite-element model for soil behaviour

Nadimi, Sadegh; Fonseca, J.

doi:10.1680/jgeot.16.p.147

Cited by 14 publications

(15 citation statements)

References 46 publications

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“…The material parameters used in the simulation are listed in Table 1. An explicit integration scheme was employed so that the same procedure can be used to simulate an assembly of grains (Nadimi & Fonseca, 2017). The properties of hard contact behaviour -that is, all the force is transmitted through the contact -were defined between the two contacting bodies.…”

Section: Behaviour Of a Single Spherementioning

confidence: 99%

“…The micro finite-element (μFE) model (Nadimi & Fonseca, 2017) was developed with the aim of providing a more realistic representation of the physics of granular behaviour by incorporating the actual particle morphology and contact topology of real soil into deformable numerical grains. One advantage of representing grains as deformable bodies is the possibility of introducing plasticity at the grain-scale.…”

Section: Introductionmentioning

confidence: 99%

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A micro finite-element model for soil behaviour: numerical validation

Nadimi

Fonseca

2018

Géotechnique

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This is the published version of the paper.This version of the publication may differ from the final published version. A micro finite-element (μFE) model capable of handling arbitrary shapes and deformable grains has been developed by the authors. The basis of this μFE model is to use a virtualised soil fabric obtained from micro computed tomography (μCT) of real sand to simulate grain-to-grain interaction in a framework of combined discrete-finite-element method. By incorporating grain deformation into the model, the contact response emerges from the interaction of contacting bodies and each irregular contact area will produce a unique response. A detailed numerical description of grain morphology and contact topology of a natural sand and the subsequent simulation are presented in the original paper. The present study focuses on the numerical validation of the constitutive contact behaviour against existent theories, for a single sphere and an assembly of spheres. The ability of the model to simulate elastic-plastic behaviour making use of the deformability of the grains is demonstrated. The unloading-reloading behaviour associated with the geometrical arrangement of the grains for a granular assembly under triaxial compression is examined in terms of energy dissipation quantities. Permanent repository link:

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Section: Behaviour Of a Single Spherementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A micro finite-element model for soil behaviour: numerical validation

Nadimi

Fonseca

2018

Géotechnique

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“…The microstructure of the sample prior to loading, obtained from the µCT images, was virtualized to be used to numerically simulate the 1D compression test [9]. The first step consisted of meshing the individual grains using a refinement of the constrained Delaunay triangulation implemented in Matlab [10].…”

Section: Numerical Modellingmentioning

confidence: 99%

Image-Based Modelling of Shelly Carbonate Sand for Foundation Design of Offshore Structures

Fonseca

Nadimi

Kong

2018

Lecture Notes in Civil Engineering

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“…The importance of grain shape in force transmission has been highlighted in a number of studies (e.g. [1,20,25]) and several attempts have been made to include grain shape in DEM simulations (e.g. [4,14]).…”

Section: Introductionmentioning

confidence: 99%

Effect of particle roughness on the bulk deformation using coupled boundary element and discrete element methods

et al. 2019

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Particles slide and roll on each other when a granular medium is sheared. Consequently, the tribological properties, such as inter-particle friction and adhesion, play a major role in influencing their bulk failure and rheology. Although the influence of roughness on adhesion and friction of contacting surfaces is known, the incorporation of the surface roughness in the numerical modelling of granular materials has received little attention. In this study, the boundary element method (BEM), which is widely used for simulating the mechanics of interacting surfaces, is coupled with discrete element method (DEM) and the bulk deformation of granular materials is analysed. A BEM code, developed in-house, is employed to calculate the normal force-displacement behaviour for rough contact deformations, based on which a contact model is proposed. This is an efficient and relatively fast method of calculating the contact mechanics of rough surfaces. The resulting model is then implemented in the simulations by DEM to determine the effect of micro-scale surface roughness on the bulk compression of granular materials. This study highlights the importance of the effect of surface characteristics on contact behaviour of particles for the case of shallow footing and provides an efficient approach for modelling the flow behaviour of a large number of rough particles. Keywords Contact mechanics • Numerical modelling • Discrete element method • Boundary element method List of symbols A c Area of contact E Elastic modulus E * Effective contact elastic modulus H Hardness N Total number of nodes in the domain φ Coefficient of friction p s 1 , s 2 Applied contact pressure r Rigid body movement of two rough surfaces in normal direction R Radius of sphere s 1 , s 2 Coordinate of area that pressure is applied S q Root mean squared height u z (x,y) Material deformation F N Load in the normal direction (x, y) Coordinate in which surface deformation is obtained Z 1 , Z 2 The surface profiles of the two rough particles α, β Roughness parameters ν Poisson's ratio

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A micro finite-element model for soil behaviour

Abstract: This is the published version of the paper.This version of the publication may differ from the final published version. Permanent repository link:http://openaccess.city.ac.uk/18100/ Link to published version: http://dx

Cited by 14 publications

References 46 publications

A micro finite-element model for soil behaviour: numerical validation

A micro finite-element model for soil behaviour: numerical validation

Image-Based Modelling of Shelly Carbonate Sand for Foundation Design of Offshore Structures

Effect of particle roughness on the bulk deformation using coupled boundary element and discrete element methods

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