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• W1559420101 abstract "Abstract : Molecular dynamics simulations are applied to the study of the constitutive law for dense flows of cohesive grains.We focus on a simple cohesive model in which the important parameters are the tensile strength and the frictioncoefficient in contacts. The study of plane shear flows highli ghts a simple dependence of the macroscopic internalfriction law on both the shear state and the cohesion intensity. Such state variables boil down to two dimensionlessparameters, the inertial number and the cohesion number, which respectively compare the inertia of grains and theattractive forces with the applied confining forces. In the c ase of a gravity-driven flow down a slope, the cohesionnumber increases near the free surface, where cohesion-enhanced friction leads to plug flow. Key-words :Flow ; Granular ; Cohesion1 IntroductionDense flows of cohesionless grains have a rich rheological be havior highlighted by several stud-ies motivated by fundamental issues as well as practical needs (see for example the review byGdr Midi , 2004). However, granular materials outside the laboratory often present significantinterparticular cohesive forces due to different physical origins : van der Waals forces for smallenough grains, as in clays and powders Rietema (1991) or within the third body in tribologyIordanoff et al. (2002), capillary forces between the humid grains of unsaturated soils or wetsnow, and solid bridges in sintered powders or when liquid menisci freeze. The possible influ-ence of cohesive forces on dense granular flows has been large ly ignored so far. The presentnumerical study addresses this issue with a model cohesive granular material, in which the ten-sile strength of intergranular contacts – a common feature of cohesive granular materials – playsa central role. Section 2 describes the simulated systems are defines the dimensionless numbers,whiah are used as control parameters. Homogeneous plane shear flows, as studied in Sec. 3,give a direct access to the constitutive law involving the cohesion number. Its validity is thenchecked for flows down inclines, and we end with a brief conclu sion (Sec. 4)." @default.
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• W1559420101 date "2007-08-27" @default.
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• W1559420101 title "Behavior of model cohesive granular materials in the dense flow regime" @default.
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