Search results for "Granular media"
showing 2 items of 2 documents
An automated procedure for computing the packing properties of dense and locked sands by image analysis of thin sections
2014
The macroscopic mechanical behaviour of dense sands originates to a great extent from their microstructural characteristics such as the coordination number, the grain contact and the packing density indexes. The study of intergranular contacts and the reckoning of these indexes may be carried out on planar images of the grains either by means of time-consuming visual inspection assisted by CAD or by automatic image analysis. An innovative method for the automatic determination of microstructural characteristics of sands based on image analysis of thin section is proposed. Tests performed on a locked sand show that the proposed method is much more effective, convenient and faster than the us…
Correlation Functions and Finite–Size Effects in Granular Media
2014
A model is considered, where the local order parameter is an n–component vector. This model allows us to calculate correlation functions, describing the correlations between local order parameter at different spatial coordinates. The longitudinal and transverse Fourier–transformed two–point correlation functions \(G_{\parallel }(\mathbf{k})\) and \(G_{\perp }(\mathbf{k})\) in presence of an external field h are considered in some detail. In the thermodynamic limit, these correlation functions exhibit the so-called Goldstone mode singularities below certain critical temperature at an infinitesimal external field \(h = +0\). The actual model can be applied to granular media, in which case it …