Mechanical behavior of mixtures of circular and rectangular 2D particles

Charalampidou, Elli-Maria Christodoulos; Combe, Gaël; Viggiani, Gioacchino; Lanier, J.

doi:10.1063/1.3180054

Cited by 11 publications

(11 citation statements)

References 11 publications

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“…Since the experiments of Oda [3] performed on assemblies of oval cross-sectional rods, several studies have been reported and rather recent results suggest that assemblies of non-spherical particles exhibit higher shear strength than sphere packings and may approach unusually high packing fractions [2,4,5,6]. However, such results are often limited to a specific shape parameter, such as angularity with polygonal particles [7,8,9], elongation with ellipsoids or elongated faceted particles [10,11,12,13,14,15], or nonconvexity [16,17,18]. Moreover the effect of each of these parameters is experimentally difficult to investigate in a systematic way.…”

Section: Introductionmentioning

confidence: 87%

A benchmark for particle shape dependence

Combe¹,

Nouguier‐Lehon²,

Azéma³

et al. 2013

AIP Conference Proceedings

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A study on the effect of particle shape and fragmentation on the mechanical behavior of granular materials using discrete element method AIP Conference Proceedings 1542, 915 (2013) Abstract. Particle shape is a major parameter for the space-filling and strength properties of granular materials. For a systematic investigation of shape effect, a numerical benchmark test was set up within a collaborative group using different numerical methods and particles of various shape characteristics such as elongation, angularity and nonconvexity. Extensive 2D shear simulations were performed in this framework and the shear strength and packing fraction were compared for different shapes. We show that the results may be analyzed in terms of a low-order shape parameter η describing the degree of distortion from a perfectly circular shape. In particular, the shear strength is an increasing function of η with nearly the same trend for all shapes, the differences being of second order compared to η. We also observe a nontrivial behavior of packing fraction which, for all our simulated shapes, increases with η from the random close packing fraction for disks, reaches a peak considerably higher than that for disks, and subsequently declines as η is further increased. Finally, the analysis of contact forces for the same value of η leads to very similar statistics regardless of our specific particle shapes.

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Section: Introductionmentioning

confidence: 87%

A benchmark for particle shape dependence

Combe¹,

Nouguier‐Lehon²,

Azéma³

et al. 2013

AIP Conference Proceedings

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“…1, located in 3SR Laboratory in Grenoble, France. The apparatus was used and described numerous times (Joer et al [6]; Calvetti et al [1]; Sibille and Froiio [11]; Hall et al [5]; Lirer et al [7]; Charalampidou et al [3]). 1γ2ε is able to impose different plane stress loading conditions on 2D analogue Schneebeli material (Schneebeli [10]).…”

Section: Experimental Programmentioning

confidence: 99%

Particle Shape Effect on Macroscopic Behaviour of Underground Structures: Numerical and Experimental Study

Szarf

Combe

Villard

2015

Studia Geotechnica Et Mechanica

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The mechanical performance of underground flexible structures such as buried pipes or culverts made of plastics depend not only on the properties of the structure, but also on the material surrounding it. Flexible drains can deflect by 30% with the joints staying tight, or even invert. Large deformations of the structure are difficult to model in the framework of Finite Element Method, but straightforward in Discrete Element Methods. Moreover, Discrete Element approach is able to provide information about the grain-grain and grain-structure interactions at the microscale. This paper presents numerical and experimental investigations of flexible buried pipe behaviour with focus placed on load transfer above the buried structure. Numerical modeling was able to reproduce the experimental results. Load repartition was observed, being affected by a number of factors such as particle shape, pipe friction and pipe stiffness.

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“…Shear tests have been performed in the 1γ2ε apparatus, which is essentially a plane stress version of the directional shear cell developed for testing soils (see [1,9,10] for details). Results from only one such test are discussed herein, although the results are consistent throughout the entire campaign.…”

Section: Shear Testmentioning

confidence: 99%