Shear of granular materials composed of ellipses

Wang, Dong; Zheng, Hu; Ji, Yuan; Barés, Jonathan; Behringer, Robert

doi:10.1007/s10035-019-0965-8

Cited by 11 publications

(8 citation statements)

References 32 publications

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“…Subsequent studies found geometric entanglement in staple-shaped particles, which entangle in a manner consistent with a random contact model [6]. Packings of granular staples, star-shaped, both rigid and flexible rods, and z-shaped particles have also exhibited tensile strength [20], with relevance for aleatory design [21] and strengthening granular materials under strain [22][23][24]. Banana-shaped or bent-core rods are of broad interest to the liquid crystal community because of their rich liquid crystalline phase-space [2,[25][26][27].…”

Section: Introductionmentioning

confidence: 82%

Excluded area of superellipse sector particles

Kornick

Brzinski

2021

Phys. Rev. E

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Superellipse sector particles (SeSPs) are segments of superelliptical curves that form a tunable set of hard-particle shapes for granular and colloidal systems. SeSPs allow for continuous parameterization of corner sharpness, aspect ratio, and particle curvature; rods, circles, rectangles, and staples are examples of shapes SeSPs can model. We measure the excluded area of SeSPs as a function of opening aperture size, beginning with the special case of semi-circular particles and then generalizing to more angular shapes. The excluded area decreases sigmoidally with increasing opening aperture, with sharper SeSP corners resulting in a sharper decrease. Whether two particles can be placed without overlap depends on both the center-of-mass separation and relative orientation. Radial correlation plots of the allowed configurations reveal circular regions centered at each of the particle's two endpoints that indicate configurations of mutually-entangled particle interactions. Simultaneous entanglement with both endpoints is geometrically impossible; the overlap of these two regions therefore represents an excluded area in which no particles can be placed regardless of orientation. The regions' distinct boundaries indicates a translational frustration with implications for the dynamics of particle rearrangements (e.g. under shear). Representing translational and rotational degrees of freedom as a hypervolume, we find a topological change that suggests geometric frustration arises a phase transition in this space. Together, this work offers a path towards a unified theory for particle shape-control of bulk material properties.

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Section: Introductionmentioning

confidence: 82%

Excluded area of superellipse sector particles

Kornick

Brzinski

2021

Phys. Rev. E

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“…One conventional shape descriptor for the shape anisotropy feature is aspect ratio [7,8], which is the ratio of the length over the width of a particle. Te infuence of aspect ratio on the shear behaviour of granular materials has been investigated in previous studies [1][2][3][8][9][10]. Te results show that the shear strength of granular assemblies would be strongly enhanced with the increase in aspect ratio due to the possible attribution of a better ability of the elongated particles to interlock [1,2,8,10,11].…”

Section: Introductionmentioning

confidence: 88%

“…For example, the preferred direction of the long axis of particles is horizontal when the cohesionless soil with elongated or fattened particles deposits under gravity, and this condition would lead to the anisotropy feature of the deposited soil. Anisotropy is an important feature and imposes a notable infuence on the mechanical behaviour of granular packings, which has been attracting much research interest in the feld of powder and soil engineering [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Combined Influence of Particle Shape and Fabric on the Shear Behaviour of Granular Materials

Liu

Zhang

et al. 2022

Advances in Materials Science and Engineering

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The anisotropy feature is an important characteristic of granular materials in natural life and is caused by two facts: the anisotropy feature of particle shape, such as an elongated or flattened shape, and the anisotropy feature of the packing fabric, such as the preferable orientation of particle alignment. The discrete element method has been commonly used in the study of meso-mechanics of granular materials and is in our study to simulate the direct shear test with particles of various aspect ratios under different initial orientation alignment conditions for assessing the coupled influence of anisotropy from particle shape and fabric of particle packings on the shear behaviour of granular materials. Analysis results show that anisotropy from the particle shape has the most significant influence on the shear behaviour of a granular packing when the packing has the initial anisotropy fabric of an orientational alignment perpendicular to the shear direction. Moreover, the initial fabric anisotropy of a granular packing has an increasing influence with the rise in anisotropy of particle shape. A combined anisotropic factor is finally introduced to reflect the coupled influence of the shape anisotropy of particles and the fabric anisotropy of particle packings.

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“…e sediment will undergo complex movements, namely, sedimentation and suspension, which leads to channel sedimentation, estuarial and coastal changes, water pollution, and other ecological problems [14][15][16][17][18]. ese problems must be considered and solved in hydraulic engineering [19], coastal engineering, port, and waterway engineering in coastal and estuarial areas. Due to incoming tides and waves, sediment is generally formed in tidal estuary and wave dominated estuary on the landward side [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

The Properties of the Tide Current and Sediment at a Port of Southern China

Shen

Xie²,

Song

2022

Advances in Materials Science and Engineering

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Environmental factors of projects in the sea area, such as tidal current characteristics and sediment transport patterns, play a decisive role in the safe operation of the harbor. Based on the observation data of tide level, tidal current, suspended sediment, and surface sediment in the Port of Shenquan, this paper focuses on the study of the characteristics of tidal current and sediment of projects in the sea area. According to the measured tide hydrograph, it can be concluded that the tide in the Port of Shenquan is irregular diurnal, and the flow of rising and falling tides is basically rectilinear. The velocity of the neap tide is higher than that of spring tide, which is mainly related to the strong winds and waves. The sand source is limited, and the sediment concentration in the water is very low. The hourly sediment concentration in each station fluctuates within a narrow range, independent of hourly velocity change. The sediment is coarse and fine, with a distribution pattern of coarse near shore, fine in deep water, coarse in East and West, and fine in the middle, and the sorting coefficient of sediment is medium to well.

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Shear of granular materials composed of ellipses

Cited by 11 publications

References 32 publications

Excluded area of superellipse sector particles

Excluded area of superellipse sector particles

Combined Influence of Particle Shape and Fabric on the Shear Behaviour of Granular Materials

The Properties of the Tide Current and Sediment at a Port of Southern China

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