How fines content affects granular plasticity of under-filled binary mixtures

In recent years, binary mixtures have been the subject of numerous experimental and numerical studies. However, few attempts made on investigating effect fines content (fc) non-associated plasticity mixtures, which is significant for constitutive modelling such material. Thanks to 2D DEM simulations, this study aims provide an understanding how fc affects character flow rule resulting material instability in mixtures. For under-filled materials (where coarse grains constitute most load-bearing skeleton), fine help stabilize granular assembly (1) by limiting macroscopic plastic deformations, results strain hardening, (2) reducing contractive microstructure reorganizations, reduces gap between associated directions. Fines influences direction but has no influence normal yield surface. Eventually, perspectives mesoscale mechanisms are given highlight role geometrical mechanical properties materials.