Compaction of granular materials composed of deformable particles

Thanh Hai Nguyen (1, 2, 3) , Saeid Nezamabadi (2, 3) , Jean-Yves Delenne (4) , Farhang Radjai (5, 2, 3)

1 University of Science and Technology
2 LMGC - Laboratoire de Mécanique et Génie Civil
3 PMMD - Physique et Mécanique des Milieux Divisés
4 UMR IATE - Ingénierie des Agro-polymères et Technologies Émergentes
5 MSE 2 - Multiscale Material Science for Energy and Environment

In soft particle materials such as metallic powders the particles can undergo large deformations without rupture. The large elastic or plastic deformations of the particles are expected to strongly affect the mechanical properties of these materials compared to hard particle materials more often considered in research on granular materials. Herein, two numerical approaches are proposed for the simulation of soft granular systems: (i) an implicit formulation of the Material Point Method (MPM) combined with the Contact Dynamics (CD) method to deal with contact interactions, and (i) Bonded Particle Model (BPM), in which each deformable particle is modeled as an aggregate of rigid primary particles using the CD method. These two approaches allow us to simulate the compaction of an assembly of elastic or plastic particles. By analyzing the uniaxial compaction of 2D soft particle packings, we investigate the effects of particle shape change on the stress-strain relationship and volume change behavior as well as the evolution of the microstructure.

Mots clés: mechanical characteristic; strain

Mots clés: déformation mécanique; propriété mécanique; produit granulaire; comportement élastique

Domaines: Sciences du Vivant [q-bio]

Thanh Hai Nguyen, Saeid Nezamabadi, Jean-Yves Delenne, Farhang Radjai. Compaction of granular materials composed of deformable particles. International Conference on Micromechanics of Granular Media (Powders & Grains), Jul 2017, Montpellier, France. ⟨10.1051/epjconf/201714005013⟩. ⟨hal-01595248⟩