Scale separation in granular packings: stress plateaus and fluctuations

It is demonstrated, by numerical simulations of a 2D assembly of polydisperse disks, that there exists a range (plateau) of coarse-graining scales for which the stress tensor field in a granular solid is nearly resolution independent, thereby enabling an "objective" definition of this fiel...

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Veröffentlicht in:	Physical review letters 2006-04, Vol.96 (16), p.168001-168001, Article 168001
Hauptverfasser:	Goldenberg, C, Atman, A P F, Claudin, P, Combe, G, Goldhirsch, I
Format:	Artikel
Sprache:	eng
Schlagworte:	Algorithms Computer Simulation Condensed Matter Physics Porosity Soft Condensed Matter Stress, Mechanical
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container_end_page	168001
container_issue	16
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container_title	Physical review letters
container_volume	96
creator	Goldenberg, C Atman, A P F Claudin, P Combe, G Goldhirsch, I
description	It is demonstrated, by numerical simulations of a 2D assembly of polydisperse disks, that there exists a range (plateau) of coarse-graining scales for which the stress tensor field in a granular solid is nearly resolution independent, thereby enabling an "objective" definition of this field. Expectedly, it is not the mere size of the system but the (related) magnitudes of the gradients that determine the widths of the plateaus. Ensemble averaging (even over "small" ensembles) extends the widths of the plateaus to subparticle scales. The fluctuations within the ensemble are studied as well. Both the response to homogeneous forcing and to an external compressive localized load (and gravity) are studied. Implications to small solid systems and constitutive relations are briefly discussed.
doi_str_mv	10.1103/physrevlett.96.168001
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subjects	Algorithms Computer Simulation Condensed Matter Physics Porosity Soft Condensed Matter Stress, Mechanical
title	Scale separation in granular packings: stress plateaus and fluctuations
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