Discrete element modeling of inherently anisotropic granular assemblies with polygonal particles

Hosseininia, Ehsan Seyedi

doi:10.1016/j.partic.2011.11.015

Cited by 50 publications

(20 citation statements)

References 35 publications

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“…Such reduction indicates that the particles tend to rotate and that the particles inclination is in such a way that they carry applied loads. A detailed comparison of the degree of particle rotation among anisotropic assemblies is given by Seyedi Hosseininia [27]. According to Figures 12b and 13b, the principal direction of contact vector anisotropy of both normal and tangential components remains almost constant in each sample and is equal to the bedding angle ().…”

Section: Inherently-anisotropic Assembliesmentioning

confidence: 99%

“…A brief review of the numerical procedure used in the simulations can be found in the references Sitharam et al [56] and Seyedi Hosseininia [27] for circular and polygonal particles, respectively. In what follows, a brief review of the modeling features of the 2D samples is explained here.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Since the diameter of the specimen is large enough with respect to the average particle diameter ) 40 30 / (  particle sample D D , the effect of particle size on test results can be ignored. All the specimens are generated according to the predefined particle size distribution in such a way that the particles are placed in the specimen randomly in condition that they should not be overlapped (see [27] for more information). The assemblies with elongated particles have the same particle frequency distribution, which is characterized by the uniformity coefficient ) / ( Accordingly, the specimen deforms under such biaxial loading condition and the circular form turns into an elliptical one, which is elongated horizontally (Figure 5b).…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…The values of DEM parameters used in the simulations are the same as those mentioned in the reference by Seyedi Hosseininia [27]. The only difference relates to the value of the inter- …”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The technical term 'fabric' describes spatial arrangement of particles, voids, and associated contacts. Based on experimental [e.g., 23,24,25] as well as numerical studies [e.g., 26,27,28], micromechanical investigations reveal that reciprocal mechanisms of generation and collapse of column-like microstructures among particles can explain the shear strength mobilization and deformational behavior of the aggregate media during the loading process.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A micromechanical study on the stress rotation in granular materials due to fabric evolution

Hosseininia

2015

Powder Technology

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Section: Inherently-anisotropic Assembliesmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

“…The values of DEM parameters used in the simulations are the same as those mentioned in the reference by Seyedi Hosseininia [27]. The only difference relates to the value of the inter- …”

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A micromechanical study on the stress rotation in granular materials due to fabric evolution

Hosseininia

2015

Powder Technology

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Constitutive modeling of inherent anisotropy in a strain space multiple mechanism model for granular materials

Ueda

Iai

2018

Num Anal Meth Geomechanics

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Summary Consideration of fabric anisotropy is crucial to gaining an improved understanding of the behavior of granular materials. This paper presents a constitutive model to describe the sand behavior associated with fabric anisotropy within a framework of a strain space multiple mechanism model. In the proposed model, a second‐order fabric tensor is extended by incorporating a new function that represents the effect of inherent (or initial fabric) anisotropy, along with three additional parameters: two of them, a1 and a2, control the degree of anisotropy, and the second mode of inherent anisotropy can be expressed by introducing the parameter a2 as well as the first mode by the parameter a1. The third parameter, θ0, expresses the principal direction of inherent anisotropy (eg, the normal vector direction of bedding planes relative to horizontal axis). The formulation of the dilative component of dilatancy (ie, positive dilatancy) is also extended to consider the effect of inherent anisotropy based on the interlocking mechanism. Experimental data on the complex anisotropic responses of Fraser River sand and Toyoura sand under monotonic loading is used to validate this model. The proposed model is shown to successfully capture anisotropic responses, which become contractive or dilative depending on different principal‐stress directions, with a single set of anisotropy parameters; thus, the model is considered to possess the capability to simulate the anisotropic behaviors of granular materials. In addition to different loadings on the same fabric, the effects of different fabric anisotropies upon the sand behavior under the same loadings are also investigated.

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Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

Pan

Zhang

Wang

2022

Num Anal Meth Geomechanics

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The shape of particles can have a great impact on the mechanical behavior of granular material, which is not only limited to general shape measures such as sphericity and roundness, but also applies for small scale measures such as surface asperities. In this study, triaxial tests on 3D printed particles and DEM tests show that small surface asperities on spherical particles can contribute significantly to the peak strength and dilatancy of granular material, which cannot be reflected by simply altering the traditional contact parameters in DEM. Using polydispersed particles with artificially designed surface asperities in the form of bumps for laboratory and DEM triaxial tests, both macro and micro scale behavior of granular material are analyzed to reveal the influence of these small surface asperities. The result shows that surface asperities can change the coordination number, anisotropy, and normal contact force on the micro scale, increasing the interlocking between particles and restricting particle rotation, which leads to the increase of peak strength and dilatancy on the macro scale. Although the commonly adopted approach of introducing rolling resistance to reflect shape influence can help to enhance the simulation of stress‐strain relationship, especially for particles with relatively small artificial asperities, the micro scale influence of rolling resistance and surface asperities are found to be different as the size of the asperities increase.

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Discrete element modeling of inherently anisotropic granular assemblies with polygonal particles

Cited by 50 publications

References 35 publications

A micromechanical study on the stress rotation in granular materials due to fabric evolution

A micromechanical study on the stress rotation in granular materials due to fabric evolution

Constitutive modeling of inherent anisotropy in a strain space multiple mechanism model for granular materials

Influence of small particle surface asperities on macro and micro mechanical behavior of granular material

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