Abstract: The frictional collapse of an assembly of equisized spheres is studied by a discrete element model. The macroscopic constitutive response is determined as a function of the level of Coulomb ...

Abstract: A novel mesoscale granular continuum model is derived by homogenizing the mechanical behavior of six particles in contact forming an octahedron structure. The elastic behavior at the particle contacts is simulated in ...

Abstract: This paper discusses the triaxial testing of a ballast material and a subballast material, which are noncohesive, granular materials typically used for construction of a railway track substructure. Both static and cyclic ...