title: Force fabric and macroscopic friction in two-dimensional granular materials.
abstract: We study the relationship between the local grain-grain friction and the force texture in a granular pile to its macroscopic emergent frictional values. We account for the force geometrical properties by a model that assumes the existence of slide planes that define macroscopic friction angles. The model depends on the measured angular distribution of contact forces and a single parameter, to be fitted, that is a function of the roughness of the slide plane. The model is tested by a state-of-the-art model of a two-dimensional granular pile built by depositing grains under gravity and submitted to an external uniaxial stress.
authors.affiliation: Laboratorio de Física Estadística de Sistemas Desordenados, Centro de Física, Instituto Venezolano de Investigaciones Científicas, Apartado 21827, Caracas 1020 A, Venezuela.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Medina
authors.forename: Xavier
authors.initials: X
authors.lastname: García
authors.forename: Vanessa
authors.initials: V
authors.lastname: Urdaneta