Self-stresses and Crack Formation by Particle Swelling in Cohesive Granular MediaReport as inadecuate




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1 PMMG - Physique et Mécanique des Milieux Granulaires LMGC - Laboratoire de Mécanique et Génie Civil 2 LMGC - Laboratoire de Mécanique et Génie Civil

Abstract : We present a molecular dynamics study of force patterns, tensile strength and crack formation in a cohesive granular model where the particles are subjected to swelling or shrinkage gradients. Non-uniform particle size change generates self-equilibrated forces that lead to crack initiation as soon as strongest tensile contacts begin to fail. We find that the coarse-grained stresses are correctly predicted by an elastic model that incorporates particle size change as metric evolution. The tensile strength is found to be well below the theoretical strength as a result of inhomogeneous force transmission in granular media. The cracks propagate either inward from the edge upon shrinkage and outward from the center upon swelling.

Keywords : rupture granular media porous media cohesion shrinkage swelling





Author: Moulay Saïd El Youssoufi - Jean-Yves Delenne - Farhang Radjai -

Source: https://hal.archives-ouvertes.fr/



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