Cohesive granular texture

“…In other words, the grains keep together to form a self-sustained structure in the absence of confining stresses. In general, various loading histories such as consolidation or differential particle swelling can induce self-stresses in a cohesive packing [19,40]. In our system, the self-stresses appear during relaxation.…”

Section: Bi-percolating Structure Of Self-stressesmentioning

confidence: 95%

“…However, in contrast to cohesionless media, the distribution of weak compressive forces is affected by tensile forces [19]. In wet granular media in the pendular state, the tensile action of capillary bonds bridging the gaps between neighboring particles gives rise to a network of self-equilibrated forces [20].…”

Section: Introductionmentioning

confidence: 99%

Force transmission in dry and wet granular media

et al. 2009

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We compare the probability density functions of normal forces in dry and wet granular systems from 3D simulations by molecular dynamics and contact dynamics methods. While the strong forces are characterized by a decreasing exponential distribution, we show that in the range of weak forces the force distribution in a dry granular packing is sensitive to the anisotropy of the packing and the shape of the particles. By means of a model of capillary cohesion, implemented as a force law expressing the capillary force as a function of water volume and the distance between particles, we find that distributions are exponential for both compressive and tensile forces. The particle pressures are shown to form a bi-percolating structure.

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“…The high volume fraction of the particles in cemented granular materials leads to a microstructure dominated by a network of contacting particles (jamming) as in cohesionless granular media [12,22,35,23]. In this respect, cemented granular materials differ from dilute particle-reinforced composites where the particles are interposed by the matrix.…”

Section: Introductionmentioning

confidence: 99%

“…Experiments and numerical simulations indicate that the adherence between the particles and matrix controls to a large extent the toughness and crack patterns of cemented granular materials [27,40,18,29,30,32]. However, due to the bulk action of the matrix, these materials are more complex than cohesive granular media with surface adhesion such as fine powders [16,15,23,3,8,9]. In particular, the mechanical behavior (stiffness, tensile strength and creep resistance) depends on load transfer between the matrix and the particles [10,28,39].…”

Section: Introductionmentioning

confidence: 99%

Failure of cemented granular materials under simple compression: experiments and numerical simulations

2009

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We investigate the strength and failure properties of a model cemented granular material under simple compressive deformation. The particles are LECA beads coated by a controlled volume fraction of silicone. The beads are mixed with a joint seal paste (the matrix) and moulded to obtain dense cemented granular samples of cylindrical shape. Several samples are prepared for different volume fractions of the matrix, controlling the porosity, and silicone coating upon which depends the effective particle-matrix adhesion. Interestingly, the compressive strength is found to be an affine function of the product of the matrix volume fraction and effective particle-matrix adhesion. On the other hand, it is shown that particle damage occurs beyond a critical value of the contact debonding energy. The experiments suggest three regimes of crack propagation corresponding to no particle damage, particle abrasion and particle fragmentation, respectively, depending on the matrix volume fraction and effective particle-matrix adhesion. We also use a sub-particle lattice discretization method to simulate cemented granular materials in 2D. The numerical results for crack regimes and the compressive strength are in excellent agreement with the experiments.

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Cohesive granular texture

Cited by 26 publications

References 13 publications

Additive Decomposition of Shear Strength in Cohesive Granular Media from Grain-Scale Interactions

Additive Decomposition of Shear Strength in Cohesive Granular Media from Grain-Scale Interactions

Force transmission in dry and wet granular media

Failure of cemented granular materials under simple compression: experiments and numerical simulations

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