We study the elasticity of random stiff fiber networks. The elastic response of the fibers is characterized by a central force stretching stiffness as well as a bending stiffness that acts transverse to the fiber contour. Previous studies have shown that this model displays an anomalous elastic regime where the stretching mode is fully frozen out and the elastic energy is completely dominated by the bending mode. We demonstrate by simulations and scaling arguments that, in contrast to the bending dominated elastic energy, the equally important elastic forces are to a large extent stretching dominated. By characterizing these forces on microscopic, mesoscopic and macroscopic scales we find two mechanisms of how forces are transmitted in the network. While forces smaller than a threshold Fc are effectively balanced by a homogeneous background medium, forces larger than Fc are found to be heterogeneously distributed throughout the sample, giving rise to highly localized force chains known from granular media.
Force distributions and force chains in random stiff fiber networks. Publishing Authors By Initials
Force distributions and force chains in random stiff fiber networks. Journal Published:
PUBLICATION TYPE: Research Support, Non-U.S. Gov
Journal: The European physical journal. E, Soft matter
VOLUME: 24
Page Numbers: 47-53
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ISSN: 1292-8941
DAY: 3
MONTH: 09
YEAR: 2007
Force distributions and force chains in random stiff fiber networks. Information
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LANGUAGE: eng
NlmUniqueID: 101126530
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Grant and Affiliation Information for Force distributions and force chains in random stiff fiber networks.
AFFILIATION: Arnold Sommerfeld Center for Theoretical Physics and Center for NanoScience, Department of Physics, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 München, Germany. claus.heussinger@physik.lmu.de
Country: France
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MEDLINETA: Eur Phys J E Soft Matter
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