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Relaxation Mechanisms in the Unfolding of Thin Sheets and M. Adda-Bedia2
 

Summary: Relaxation Mechanisms in the Unfolding of Thin Sheets
B. Thiria1
and M. Adda-Bedia2
1
Laboratoire de Physique et Me´canique des Milieux He´te´roge`nes, CNRS-ESPCI-UPMC Paris 6,
Universite´ Paris-Diderot, 10 rue Vauquelin, 75005 Paris, France
2
Laboratoire de Physique Statistique, Ecole Normale Supe´rieure, UPMC Paris 6, Universite´ Paris-Diderot, CNRS,
24 rue Lhomond, 75005 Paris, France
(Received 10 March 2011; published 8 July 2011)
When a thin sheet is crumpled, creases form in which plastic deformations are localized. Here we study
experimentally the relaxation process of a single fold in a thin sheet subjected to an external strain. The
unfolding process is described by a quick opening at first and then a progressive slow relaxation of the
crease. In the latter regime, the necessary force needed to open the folded sheet at a given displacement is
found to decrease logarithmically in time, allowing its description through an Arrhenius activation
process. We accurately determine the parameters of this law and show its general character by performing
experiments on both Mylar and paper sheets.
DOI: 10.1103/PhysRevLett.107.025506 PACS numbers: 62.40.+i, 46.32.+x, 46.35.+z, 68.55.Àa
The physics of folding displays interesting phenomena
in connection with mechanical and geometrical properties

  

Source: Adda-Bedia, Mokhtar - Laboratoire de Physique Statistique, Département de Physique, École Normale Supérieure

 

Collections: Physics