منابع مشابه
Critical Exponents for Granular Phase Transitions
The solid–fluid phase transition of a granular material shaken horizontally is investigated numerically. We find that it is a first-order phase transition and propose two order parameters, namely the averaged kinetic energy and the averaged granular temperature, to determine the fluidization point precisely. It scales as amplitude times square of the frequency of the external vibration. Using t...
متن کاملPhase transitions far from equilibrium in wet granular matter
The phase diagram of vertically agitated wet granular matter is presented, both experimentally and by simulation. We observe two phase transitions, one of which is driven by the applied force (acceleration), the other by injected energy (velocity of container walls). All observed features can be traced down to the hysteretic nature of capillary bridge formation and rupture. Other details of the...
متن کاملHyperstaticity and loops in frictional granular packings
The hyperstatic nature of granular packings of perfectly rigid disks is analyzed algebraically and through numerical simulation. The elementary loops of grains emerge as a fundamental element in addressing hyperstaticity. Loops consisting of an odd number of grains behave differently than those with an even number. For odd loops, the latent stresses are exterior and are characterized by the sum...
متن کاملNonlinear elastic stress response in granular packings.
We study the nonlinear elastic response of a two-dimensional material to a localized boundary force, with the particular goal of understanding the differences observed between isotropic granular materials and those with hexagonal anisotropy. Corrections to the classical Boussinesq result for the stresses in an infinite half space of a linear, isotropic material are developed in a power series i...
متن کاملAngularly anisotropic correlation in granular packings.
We present an x-ray microtomography study of the three-dimensional structural correlations in monodisperse granular packings. By measuring an orientation-dependent pair correlation function, we find that the local structure shows an angularly anisotropic orientation correlation. The correlation is strongest along the major axis of the local Minkowski tensor of the Voronoi cell. It turns out tha...
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ژورنال
عنوان ژورنال: Physica A: Statistical Mechanics and its Applications
سال: 1996
ISSN: 0378-4371
DOI: 10.1016/0378-4371(95)00433-5