
The packing of elastic bodies has emerged as a paradigm for the study of macroscopic disordered systems. However, progress is hampered by the lack of controlled experiments. Here we consider a model experiment for the isotropic two-dimensional confinement of a rod by a central force. We seek to measure how ordered is a folded configuration and we identify two key quantities. A geometrical characterization is given by the number of superposed layers in the configuration. Using temporal modulations of the confining force, we probe the mechanical properties of the configuration and we define and measure its effective compressibility. These two quantities may be used to build a statistical framework for packed elastic systems.
4 pages, 5 figures
Condensed Matter - Materials Science, Statistical Mechanics (cond-mat.stat-mech), Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, and strings 61.43.-j -Disordered solids, 510, [PHYS.COND.CM-SM] Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], 46.32.+x -Static buckling and instability 46.70.Hg -Membranes, rods, [NLIN.NLIN-AO] Nonlinear Sciences [physics]/Adaptation and Self-Organizing Systems [nlin.AO], Soft Condensed Matter (cond-mat.soft), [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], [NLIN.NLIN-AO]Nonlinear Sciences [physics]/Adaptation and Self-Organizing Systems [nlin.AO], Condensed Matter - Statistical Mechanics
Condensed Matter - Materials Science, Statistical Mechanics (cond-mat.stat-mech), Materials Science (cond-mat.mtrl-sci), FOS: Physical sciences, Condensed Matter - Soft Condensed Matter, and strings 61.43.-j -Disordered solids, 510, [PHYS.COND.CM-SM] Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], 46.32.+x -Static buckling and instability 46.70.Hg -Membranes, rods, [NLIN.NLIN-AO] Nonlinear Sciences [physics]/Adaptation and Self-Organizing Systems [nlin.AO], Soft Condensed Matter (cond-mat.soft), [PHYS.COND.CM-SM]Physics [physics]/Condensed Matter [cond-mat]/Statistical Mechanics [cond-mat.stat-mech], [NLIN.NLIN-AO]Nonlinear Sciences [physics]/Adaptation and Self-Organizing Systems [nlin.AO], Condensed Matter - Statistical Mechanics
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