Emergence of Shear Bands in Confined Granular Systems: Singularity of the q-Statistics
AbstractThe statistics of grain displacements probability distribution function (pdf) during the shear of a granular medium displays an unusual dependence with the shear increment upscaling as recently evinced (see “experimental validation of a nonextensive scaling law in confined granular media”). Basically, the pdf of grain displacements has clear nonextensive (q-Gaussian) features at small scales, but approaches to Gaussian characteristics at large shear window scales—the granulence effect. Here, we extend this analysis studying a larger system (more grains considered in the experimental setup), which exhibits a severe shear band fault during the macroscopic straining. We calculate the pdf of grain displacements and the dependency of the q-statistics with the shear increment. This analysis has shown a singular behavior of q at large scales, displaying a non-monotonic dependence with the shear increment. By means of an independent image analysis, we demonstrate that this singular non-monotonicity could be associated with the emergence of a shear band within the confined system. We show that the exact point where the q-value inverts its tendency coincides with the emergence of a giant percolation cluster along the system, caused by the shear band. We believe that this original approach using Statistical Mechanics tools to identify shear bands can be a very useful piece to solve the complex puzzle of the rheology of dense granular systems. View Full-Text
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Viallon-Galinier, L.; Combe, G.; Richefeu, V.; Picardi Faria Atman, A. Emergence of Shear Bands in Confined Granular Systems: Singularity of the q-Statistics. Entropy 2018, 20, 862.
Viallon-Galinier L, Combe G, Richefeu V, Picardi Faria Atman A. Emergence of Shear Bands in Confined Granular Systems: Singularity of the q-Statistics. Entropy. 2018; 20(11):862.Chicago/Turabian Style
Viallon-Galinier, Léo; Combe, Gaël; Richefeu, Vincent; Picardi Faria Atman, Allbens. 2018. "Emergence of Shear Bands in Confined Granular Systems: Singularity of the q-Statistics." Entropy 20, no. 11: 862.
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