The particle size ratio (PSR) is an important parameter for binary granular materials, which may affect the microstructure and macro behaviors of materials. However, effect on assemblies with different arrangements still unclear. To explore further clarify PSR in packing structures, three types numerical samples regular, layered, random are designed. Numerical results show that has significant ...

We show that near densest packing the perturbations of the hexagonal close packed (hcp) structure yield higher entropy than perturbations of any other densest packing. The difference between the various structures shows up in the correlations between motions of nearest neighbors. In the hcp structure random motion of each sphere impinges slightly less on the motion of its nearest neighbors than...