Single-Grain Virtualization for Contact Behavior Analysis on Sand

Nadimi, Sadegh; Fonseca, J.

doi:10.1061/(asce)gt.1943-5606.0001740

Cited by 9 publications

(4 citation statements)

References 32 publications

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“…This aspect is significant for modelling grain-to-grain contact interaction in an assembly. In fact, contact response has a strong dependency on the grain shape as demonstrated in Nadimi & Fonseca (2017) for a series of tests on both silica and carbonate grains. Michalowski, et al (2017) also showed through single grain experiments that contact response for natural grains does not follow a Hertzian response due to the effect of shape.…”

Section: Introductionmentioning

confidence: 92%

A micro finite-element model for soil behaviour: experimental evaluation for sand under triaxial compression

et al. 2020

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This paper evaluates the ability of a combined discrete-finite element approach to replicate the experimental response of a dry sand under triaxial compression. The numerical sample was created by virtualising the fabric of a Martian regolith-like sand sample obtained from an in-situ test using X-ray micro Computed Tomography and physical properties of the grains obtained from laboratory data were used as input. The boundary and contact conditions were defined according to the experimental test. A key feature of the model is the use of deformable thinshell elements to represent the numerical membrane, which allows for a realistic failure mode and volumetric deformation. The macroscopic response of the numerical simulation is shown to compare well with the experiment. The contact regions are identified based on their ability to transmit stress and the evolution of the contact normals is shown to correlate well with the macro stress evolution. The computed stress fields within each grain are used to identify the load bearing grains in the assembly, contributing new insights beyond the commonly reported force chains.

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Section: Introductionmentioning

confidence: 92%

A micro finite-element model for soil behaviour: experimental evaluation for sand under triaxial compression

et al. 2020

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“…The stress distribution and fracture behaviour of the Brazilian disc under different arc loading angles have been investigated experimentally and numerically [39]. The results indicated that the Brazilian test with curved loading caused the stress concentration to be lower at the loading ends, but cannot promise that cracks initiate from the disc centre due to the ununiformed stress distribution at curved contact [25].…”

Section: Introductionmentioning

confidence: 99%

Modelling fracturing process using cohesive interface elements: theoretical verification and experimental validation

Zhang

Nadimi

Eissa

et al. 2023

Construction and Building Materials

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“…The Hertz-Mindlin model, which is used in many DEM studies, assumes that the contacting particles are smooth. While this model can capture key elements of contact mechanics, it is now clear that surface roughness has a measurable influence on the force-displacement relationship, particularly for normal loading and small deformation levels [2][3][4][5]. Several studies have emphasised the importance of roughness on the macroscopic soil stiffness (e.g.…”

Section: Introductionmentioning

confidence: 99%

Numerical modelling of rough particle contacts subject to normal and tangential loading

et al. 2019

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Our understanding of the mechanics of contact behaviour for interacting particles has been developed mostly assuming that surfaces are smooth. However, real particles of interest in engineering science are generally rough. While recent studies have considered the influence of roughness on the normal force-displacement relationship, surface roughness was quantified using only a single scalar measure, disregarding the topology of the surface. There are some conflicting arguments concerning the effect of roughness on the tangential or shear force-displacement relationship. In this study, optical interferometry data are used to generate the surface topology for input into a 3D finite element model. This model is used to investigate the sensitivity of the normal force-displacement response to the surface topology by considering different surfaces with similar overall roughness values. The effect of surface roughness on the tangential force-displacement relationship and the influence of loading history are also explored. The results indicate that quantifying roughness using a single value, such as the root mean square height of roughness, S q , is insufficient to predict the effect of roughness upon stiffness. It is also shown that in the absence of interlocking, rough particle surfaces exhibit a lower frictional resistance in comparison with equivalent smooth surfaces.

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Single-Grain Virtualization for Contact Behavior Analysis on Sand

Cited by 9 publications

References 32 publications

A micro finite-element model for soil behaviour: experimental evaluation for sand under triaxial compression

A micro finite-element model for soil behaviour: experimental evaluation for sand under triaxial compression

Modelling fracturing process using cohesive interface elements: theoretical verification and experimental validation

Numerical modelling of rough particle contacts subject to normal and tangential loading

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