Effect of size polydispersity on the structural and vibrational characteristics of two-dimensional granular assemblies

摘要: Two-dimensional disordered granular assemblies composed of 2048 polydispersed frictionless disks are simulated using the discrete element method. The height first peak pair correlation function, g1, local and global bond orientational parameters ψ6l ψ6g, fluctuations these decrease with increasing polydispersity s, implying transition from a polycrystalline state to an amorphous in system. As s increases, position boson ωBP shifts towards lower frequency intensity D(ωBP)/ωBP indicating that strength controlled by Moreover, inverse ωBP/D(ωBP), shear modulus G, basin curvature SIS all have similar dependence on vibrational density states at low frequencies likely originates curvature.