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Untangling the Mechanics and Topology in the Frictional Response of Long Overhand Elastic Knots

Author(s)
Audoly, B.; Khalid Jawed, Mohammad; Dieleman, Peter; Reis, Pedro Miguel
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DownloadPhysRevLett.115.118302.pdf (1.097Mb)
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Abstract
We combine experiments and theory to study the mechanics of overhand knots in slender elastic rods under tension. The equilibrium shape of the knot is governed by an interplay between topology, friction, and bending. We use precision model experiments to quantify the dependence of the mechanical response of the knot as a function of the geometry of the self-contacting region, and for different topologies as measured by their crossing number. An analytical model based on the nonlinear theory of thin elastic rods is then developed to describe how the physical and topological parameters of the knot set the tensile force required for equilibrium. Excellent agreement is found between theory and experiments for overhand knots over a wide range of crossing numbers.
Date issued
2015-09
URI
http://hdl.handle.net/1721.1/98481
Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering; Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Jawed, M. K., P. Dieleman, B. Audoly, and P. M. Reis. "Untangling the Mechanics and Topology in the Frictional Response of Long Overhand Elastic Knots." Phys. Rev. Lett. 115, 118302 (September 2015). © 2015 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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