Abstract
We study the bulk properties of isotropic and anisotropic granular assemblies using discrete element simulations and experiments. The focus is on the influence of the microstructure on the elastic properties of the aggregate. By studying three selected examples, namely assemblies of monodisperse glass beads, bidisperse mixtures in size and soft-stiff bimodal mixtures, we show that the effective moduli of a dense granular assembly can be manipulated by properly combining material characteristics and system properties.
Highlights
Granular materials behave differently from usual solids or fluids and show peculiar mechanical properties like dilatancy, history dependence or ratcheting due to their intrinsically discrete nature
We present a set of examples, namely monodisperse granular assemblies under difference stress paths, bidisperse mixtures with different size and bimodal mixtures made of soft-stiff particles We show that the bulk properties of the material can be controlled by indirectly tuning the microstructure, where increasing complexity offers more degree of freedom
As further step toward complexity, we look at how the elastic properties properties of a monodisperse, isotropic granular assembly vary in the case of a bidisperse mixture, with the main focus on the bulk modulus
Summary
Granular materials behave differently from usual solids or fluids and show peculiar mechanical properties like dilatancy, history dependence or ratcheting due to their intrinsically discrete nature. Collective deformations of many grains can lead to re-arrangements on a larger scale, (non-affine), which brings change to structure. While the former local contact creation or destruction is closely related to the compressive and tensile directions of strain, the latter phenomenon is at the origin of the interesting behavior of granular media. We present a set of examples, namely monodisperse granular assemblies under difference stress paths, bidisperse mixtures with different size and bimodal mixtures made of soft-stiff particles We show that the bulk properties of the material can be controlled by indirectly tuning the microstructure, where increasing complexity offers more degree of freedom. For the tangential component we incorporate a bilinear relationship with elastic displacement followed by Coulomb sliding with friction coefficient μ (details are given in [12])
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