3D experimental quantification of fabric and fabric evolution of sheared granular materials using synchrotron micro-computed tomography

Imseeh, Wadi H.; Druckrey, Andrew M.; Alshibli, Khalid A.

doi:10.1007/s10035-018-0798-x

Cited by 51 publications

(22 citation statements)

References 56 publications

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“…The measurement of inter-granular forces (c) is still not possible in assemblies of natural granular materials, but recent developments show promising results on small assemblies of synthetic materials [46,47,48,49]. Some studies reported on the measurement of granular fabric [50,17], but without studying the metrology of the tools that were used for the measurements. In the present paper, the results of the study on individual contacts [21] have been related and applied to an evolving assembly of thousands of particles.…”

Section: Discussionmentioning

confidence: 99%

A benchmark strategy for the experimental measurement of contact fabric

Wiebicke

Andò

Šmilauer³

et al. 2019

Granular Matter

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Section: Discussionmentioning

confidence: 99%

A benchmark strategy for the experimental measurement of contact fabric

Wiebicke

Andò

Šmilauer³

et al. 2019

Granular Matter

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“…Recently, synchrotron X-ray micro-computed tomography was used to acquire 3D images during in-situ conventional triaxial compression experiments on four granular materials with different particle surface morphologies but having a uniform PSD [72]. It was found that under compression tests, the fabric, defined based on contact normal vectors, reached a steady fabric norm and its direction evolved to loading direction at critical state.…”

Section: Influence Of Particle Shape and Psd On Critical State Fabricmentioning

confidence: 99%

“…More advanced techniques, such as spheropolygons and spheropolytopes methods proposed by Torres [74] can be applied to consider complex-shaped particles in the simulations. In addition, as the CSL location in the e-p' plane is found to be sensitive to the fines content, produced due to particle breakage [23,72,75], more wider range of…”

mentioning

confidence: 99%

The influence of particle-size distribution on critical state behavior of spherical and non-spherical particle assemblies

et al. 2018

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This paper presents an investigation into the effects of particle-size distribution on the critical state behavior of granular materials using Discrete Element Method (DEM) simulations on both spherical and non-spherical particle assemblies. A series of triaxial test DEM simulations examine the influence of particle-size distribution (PSD) and particle shape, which were independently assessed in the analyses presented. Samples were composed of particles with varying shapes characterized by overall regularity (OR) and different PSDs. The samples were subjected to the axial compression through different loading schemes: constant volume, constant mean effective stress, and constant lateral stress. All samples were sheared to large strains to ensure that a critical state was reached. Both the macroscopic and microscopic behaviors in these tests are discussed here within the framework of the anisotropic critical state theory (ACST). It is shown that both OR and PSD may affect the response of the granular assemblies in terms of the stress-strain relations, dilatancy, and critical state behaviors. For a given PSD, both the shear strength and fabric norm decrease with an increase in OR. The critical state angle of shearing resistance is highly dependent on particle shape. In terms of PSD, uniformly distributed assemblies mobilize higher shear strength and experience more dilative responses than specimens with a greater variation of particle sizes. The position of the critical state line in the e-p' space is also affected by PSD. However, the effects of PSD on critical strength and evolution of fabric are negligible. These findings highlight the importance of particle shape and PSD that should be included in the development of constitutive models for granular materials.

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“…The importance of fabric anisotropy on the mechanical behavior of sands, such as strength, permeability, and compressibility, was demonstrated by numerous experimental studies and discrete element method (DEM) studies. Some typical works included Tatsuoka [1], Azami et al [2] , Lade [3], Yang et al [4], Hosseininia [5], Fonseca et al [6,7], Zhao and Guo [8,9], Imseeh et al [10], and Mahbub and Haque [11]. Soil fabric can be described by spatial orientations of directional parameters, such as particle long axes, contact normals, and branch vectors as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…However, these methods cannot characterize fabric anisotropy in three-dimensional (3D) soil specimen. A number of studies such as Fonseca et al [6,7], Alam et al [15], Imseeh et al [10], and Mahbub and Haque [11] used X-ray CT to investigate effects of 3D fabric on strength and compressibility of sands in triaxial tests and oedometer tests. However, to date, there was a lack of studies characterizing fabric anisotropy in air-pluviated sand specimen in loose and dense conditions.…”

Section: Introductionmentioning

confidence: 99%

Characterizing Fabric Anisotropy of Air-Pluviated Sands

Sun

Zheng

et al. 2019

E3S Web Conf.

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Sand particles depositing through air generally align their largest dimensions in horizontal plane, forming a cross anisotropic fabric. Therefore, sands display varying strength, permeability, compressibility with directions. This study characterizes fabric anisotropy in loose and dense air-pluviated sand specimens scanned by X-ray Computed Tomography (X-ray CT) using a series of image processing techniques. The principal component analysis, three-dimensional watershed analysis, and Delaunay triangulation technique are used to compute directional parameters, including particle long axes, contact normals, and branch vectors, and scalar parameters, including index void ratios, coordination number, and average branch vector length. The particle long axes and branch vectors displayed preferred horizontal directions while the contact normals displayed preferred vertical directions. The dense specimen has smaller index void ratios, larger coordination number, and smaller average branch vector length than the loose specimen.

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3D experimental quantification of fabric and fabric evolution of sheared granular materials using synchrotron micro-computed tomography

Cited by 51 publications

References 56 publications

A benchmark strategy for the experimental measurement of contact fabric

A benchmark strategy for the experimental measurement of contact fabric

The influence of particle-size distribution on critical state behavior of spherical and non-spherical particle assemblies

Characterizing Fabric Anisotropy of Air-Pluviated Sands

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