%0 Journal Article
%T Scaling behavior of cohesive self-gravitating aggregates
%+ Laboratoire de Mécanique et Génie Civil (LMGC)
%+ Physique et Mécanique des Milieux Divisés (PMMD)
%+ University of Colorado [Boulder]
%A Azéma, Emilien
%A Sánchez, Paul
%A Scheeres, Daniel, J.
%< avec comité de lecture
%@ 2470-0045
%J Physical Review E
%I American Physical Society (APS)
%V 98
%N 3
%8 2018-09
%D 2018
%R 10.1103/PhysRevE.98.030901
%K Granular Asteroid
%K DEM
%K Scaling
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph]
%Z Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph]Journal articles
%X By means of extensive three-dimensional contact dynamics simulations, we analyze the strength properties and microstructure of a granular asteroid, modeled as a self-gravitating cohesive granular aggregate composed of spherical particles, and subjected to diametrical compression tests. We show that, for a broad range of system parameters (shear rate, cohesive forces, asteroid diameter), the behavior can be described by a modified inertial number that incorporates interparticle cohesion and gravitational forces. At low inertial numbers, the behavior is ductile with a well-defined stress peak that scales with internal pressure with a prefactor 0.9. As the inertial number increases, both the prefactor and fluctuations around the mean increase, evidencing a dynamical crisis resulting from the destabilizing effect of particle inertia. From a micromechanical description of the contact and force networks, we propose a model that accounts for solid fraction, local stress, particle connectivity, and granular texture. In the limit of small inertial numbers, we find a very good agreement of the theoretical estimate of compressive strength, evidencing the major role of these structural parameters for the modeled aggregates.
%G English
%2 https://hal.science/hal-01873746/document
%2 https://hal.science/hal-01873746/file/Art_Az%C3%A9ma_al_Phys.Rev.E_2018.pdf
%L hal-01873746
%U https://hal.science/hal-01873746
%~ CNRS
%~ LMGC
%~ MIPS
%~ UNIV-MONTPELLIER
%~ UM-2015-2021