2020
DOI: 10.1103/physreve.101.062903
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Yielding, rigidity, and tensile stress in sheared columns of hexapod granules

Abstract: Granular packings of nonconvex or elongated particles can form freestanding structures like walls or arches. For some particle shapes, such as staples, the rigidity arises from interlocking of pairs of particles, but the origins of rigidity for noninterlocking particles remains unclear. We report on experiments and numerical simulations of sheared columns of "hexapods," particles consisting of three mutually orthogonal sphero-cylinders whose centers coincide. We vary the length-to-diameter aspect ratio, α, of … Show more

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Cited by 19 publications
(23 citation statements)
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“…An exception is made for the particle aspect ratio [defined as the ratio of the overall length of a particle L to the diameter of the protruding arms d p (Fig. 3)] which was used by other works [21,22] to describe star-shaped particles. To aid the comparison between our work and the works reported in Refs.…”
Section: Cluster Particlesmentioning
confidence: 99%
See 1 more Smart Citation
“…An exception is made for the particle aspect ratio [defined as the ratio of the overall length of a particle L to the diameter of the protruding arms d p (Fig. 3)] which was used by other works [21,22] to describe star-shaped particles. To aid the comparison between our work and the works reported in Refs.…”
Section: Cluster Particlesmentioning
confidence: 99%
“…To aid the comparison between our work and the works reported in Refs. [21,22] the relationship between the particle aspect ratio and the particle sphericity is given in the Supplemental Material [43].…”
Section: Cluster Particlesmentioning
confidence: 99%
“…Besides spheres, other particle shapes as for example ellipsoids [7], polyhedra [8][9][10][11][12] or spherocylinders [13] have attracted the interest of researchers. Studies on packing problems in 3D included also non-convex particles like stars or hexapods [14][15][16]. The practical relevance of the latter type of objects may be found in construction industry and architecture [17,18], when one is looking for a material that forms stable aggregates of a desired shape, but on the other hand can be disassembled again with little efforts for a structural redesign.…”
Section: Introductionmentioning
confidence: 99%
“…In the past two decades, advances in technologies that can mass-produce grains of well defined shapes (e.g., 3D printing 17,18 and laser cutting 19 ) and computational tools that can efficiently model aspherical grains [20][21][22][23] have enabled numerous studies of granular materials with nonspherical grains. Many studies have characterized the mechanics and dynamics of elongated grains, such as plates or rods with varying aspect ratio [24][25][26][27][28][29][30][31][32][33][34][35][36][37] ; grains with concavities, such as staple-like grains or hexapods 17,18,[38][39][40][41] ; and angular grains, such as tetrahedra or pentagons 17,18,23,33,[42][43][44][45][46] .…”
Section: Introductionmentioning
confidence: 99%
“…Grain-scale interactions between nonspherical grains can differ significantly from the interactions that can arise between spherical grains. For instance, the presence of flat edges or significant elongation of grains introduces rotational resistance for individual grains experiencing force-bearing edge-edge (or faceface) contacts 23,[42][43][44]46,47 , and concave particles can interlock and support tensile stresses 39,40 . Microscopic interactions associated with various grain shapes have been shown to influence macroscopic properties of granular materials in many contexts, including the shear strength 13,17,18,39,43 and structural characteristics of jammed packings 23,26,28,30,30,33,35,36,44,[48][49][50][51][52][53][54][55][56] , the dynamical organization of anisotropic grains in driven granular media 27,29,31,37,57 , the rheology of dense granular flows 19,58 , the flow and clogging dynamics of granular materials driven through restricted apertures 27,34,[59][60][61] , ...…”
Section: Introductionmentioning
confidence: 99%