Mechanism governing surface stress generation

Taghavi, Nazita

doi:10.31274/etd-180810-3254

Cited by 3 publications

(4 citation statements)

References 24 publications

(28 reference statements)

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“…The so-called bubble-pack algorithm [7] was used to construct the ellipsoidal particles in this work. According to the algorithm, the closed surface of the non-spherical particle was first constructed with triangular meshes of various sizes.…”

Section: Simulation Methods and Conditionsmentioning

confidence: 99%

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Numerical investigation on effect of particle aspect ratio on the dynamical behaviour of ellipsoidal particle flow

Hossain¹,

Zhu²,

Yu³

2021

J. Phys.: Condens. Matter

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Flow of ellipsoidal particles in a modal shear cell was investigated at the microdynamic level based on discrete element method simulations. In a stress-controlled double-shear condition, the flow was studied by varying the aspect ratio of ellipsoidal particles and comparing with the flow of spherical particle assembly in terms of some key properties, including particle alignment, linear velocity, angular velocity, porosity, contact force and contact energy. It was found that particle elongation impacts the rotational displacement around the axis perpendicular to the shear direction, which causes that the ellipsoidal particles with higher elongation are more aligned with the direction of the shear velocity, with more uniform force network. This then affects other particle properties. The fluctuation of linear velocity and the angular velocity decreases with an increase in particle aspect ratio, although the particle elongation does not significantly affect the flow velocity gradient. There is a reduction in both normal and tangential forces per contact with an increase of particle elongation. Due to the variation of the particle alignment with elongation, the standard deviation of the contact energies increases and then reduces when an increase in particle aspect ratio occurs, and on contrary, the porosity has an opposite variation trend.

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Section: Simulation Methods and Conditionsmentioning

confidence: 99%

“…Various methods have been proposed. Some of the popular methods are the voxelization method [5], geometric method [6] and spherical particle clumping method [7]. The numerical study of non-spherical particles has been conducted at various static and quasistatic conditions [8], as well as complex scenario of flow [6].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on effect of particle aspect ratio on the dynamical behaviour of ellipsoidal particle flow

Hossain¹,

Zhu²,

Yu³

2021

J. Phys.: Condens. Matter

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“…A 3D triangulated mesh enclosing a volume was then reconstructed for each particle after estimating the normal vectors to the surface at each point of the cloud with the software MeshLab [20], to provide a reference geometrical description which could then be used to create a virtual model of each particle for the DEM simulations. The clump technique was chosen, specifically the "bubblepack" algorithm proposed by [21] and implemented in the commercial software [22]. Clumps are collections of overlapping spheres with no internal contacts.…”

Section: Sample Reconstruction As a Dem Modelmentioning

confidence: 99%

DEM study of an “avatar” railway ballast with real particle shape, fabric and contact mechanics

Tolomeo

McDowell

2023

Granular Matter

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In this paper we show DEM simulations of static and cyclic large triaxial tests on a sample of railway ballast. The sample is reconstructed from X-Ray tomography images of an untested laboratory sample, recovered by impregnation with an epoxy resin. Measurements of both shape and fabric are carried out; the sample shows a high anisotropy of particle orientations due to the preparation procedure and a high shape heterogeneity. A DEM model is then generated using clumps to model single particles, preserving the shape of each particle and the fabric of the sample. Results of static and cyclic simulations are shown and compared with previous simulations on numerically generated samples, showing the importance of an accurate representation of the whole range of particle shapes, as well as confirming the effect of particle anisotropy on the mechanical response. Graphical Abstract

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“…and McDowell [14], Taghavi [17], and Zheng and Hryciw [5]. The sphere cluster method has been widely used in DEM codes such as Itasca PFC 2D/3D [17], LIGGGHTS [18], and YADE [19].…”

Section: Introductionmentioning

confidence: 99%

Simulation of realistic soil behavior in geotechnical tests using physics engine technique

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Mechanism governing surface stress generation

Cited by 3 publications

References 24 publications

Numerical investigation on effect of particle aspect ratio on the dynamical behaviour of ellipsoidal particle flow

Numerical investigation on effect of particle aspect ratio on the dynamical behaviour of ellipsoidal particle flow

DEM study of an “avatar” railway ballast with real particle shape, fabric and contact mechanics

Simulation of realistic soil behavior in geotechnical tests using physics engine technique

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