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Micromechanical Origin of Plasticity and Hysteresis in Nestlike Packings

Yashraj Bhosale1,*, Nicholas Weiner2,*, Alex Butler2, Seung Hyun Kim1, Mattia Gazzola1,3,4,†, and Hunter King2,5,‡

  • 1Mechanical Sciences and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 2School of Polymer Science and Polymer Engineering, University of Akron, Akron, Ohio 44325, USA
  • 3National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 4Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
  • 5Department of Biology, University of Akron, Akron, Ohio 44325, USA

  • *These two authors contributed equally to this work.
  • †To whom correspondence should be addressed. mgazzola@illinois.edu
  • ‡To whom correspondence should be addressed. hking@uakron.edu
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Phys. Rev. Lett. 128, 198003 – Published 13 May, 2022

DOI: https://doi.org/10.1103/PhysRevLett.128.198003

Abstract

Disordered packings of unbonded, semiflexible fibers represent a class of materials spanning contexts and scales. From twig-based bird nests to unwoven textiles, bulk mechanics of disparate systems emerge from the bending of constituent slender elements about impermanent contacts. In experimental and computational packings of wooden sticks, we identify prominent features of their response to cyclic oedometric compression: nonlinear stiffness, transient plasticity, and eventually repeatable velocity-independent hysteresis. We trace these features to their micromechanic origins, identified in characteristic appearance, disappearance, and displacement of internal contacts.

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Explaining the Mechanics of a Bird’s Nest

Published 13 May, 2022

Experiments and simulations explain the unusual nature of the structure’s springiness.

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Phys. Rev. Lett. 128, 198003– Published 13 May, 2022
  • Received 1 December 2021
  • Accepted 5 April 2022
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