منابع مشابه
Microscopic origin of granular ratcheting.
Numerical simulations of assemblies of grains under cyclic loading exhibit "granular ratcheting:" a small net deformation occurs with each cycle, leading to a linear accumulation of deformation with cycle number. We show that this is due to a curious property of the most frequently used models of the particle-particle interaction: namely, that the potential energy stored in contacts is path dep...
متن کاملRatcheting of granular materials.
We investigate the quasistatic mechanical response of soils under cyclic loading using a discrete model of randomly generated convex polygons. This response exhibits a sequence of regimes, each one characterized by a linear accumulation of plastic deformation with the number of cycles. At the grain level, a quasiperiodic ratchetlike behavior is observed at the contacts, which excludes the exist...
متن کاملFinite Element Modeling of Rate-Dependent Ratcheting in Granular Materials
The present paper introduces a comprehensive model capable of describing the behavior of granular materials under cyclic loading. Its main thrust is the introduction of the “Chicago” law in a continuum approach to account for the ratcheting effects. It also emphasizes the rate-dependency as a dissipative mechanism which acts independently or jointly with the ratcheting effect. Non-associated pl...
متن کاملMicroscopic Origin of Cholesteric Pitch
We present a microscopic analysis of the instability of the nematic phase to chirality when molecular chirality is introduced perturbatively. We show that for central-force interactions the previously neglected short–range biaxial correlations play a crucial role in determining the cholesteric pitch. We propose a pseudoscalar strength which quantifies the chirality of a molecule.
متن کاملMicroscopic model for granular stratification and segregation
– We study segregation and stratification of mixtures of grains differing in size, shape and material properties poured into two-dimensional silos using a microscopic lattice model for surface flows of grains. The model incorporates the dissipation of energy in collisions between rolling and static grains and an energy barrier describing the geometrical asperities of the grains. We study the ph...
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ژورنال
عنوان ژورنال: Physical Review E
سال: 2008
ISSN: 1539-3755,1550-2376
DOI: 10.1103/physreve.77.031304