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Soft Origami: Classification, Constraint, and Actuation of Highly Compliant Origami Structures

[+] Author Affiliations
Charles M. Wheeler, Martin L. Culpepper

Massachusetts Institute of Technology, Cambridge, MA

Paper No. DETC2015-46877, pp. V05BT08A042; 7 pages
  • ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 5B: 39th Mechanisms and Robotics Conference
  • Boston, Massachusetts, USA, August 2–5, 2015
  • Conference Sponsors: Design Engineering Division, Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5713-7
  • Copyright © 2015 by ASME


Herein we discuss the folding of highly compliant origami structures — “Soft Origami.” There are benefits to be had in folding compliant sheets (which cannot self-guide their motion) rather than conventional rigid origami. Example applications include scaffolds for artificial tissue generation and foldable substrates for flexible electronic assemblies. Highly compliant origami has not been contemplated by existing theory, which treats origami structures largely as rigid or semi-rigid mechanisms with compliant hinges — “Mechanism-Reliant Origami.” We present a quantitative metric — the Origami Compliance Metric — that aids in identifying proper modeling of a homogeneous origami structure based upon the compliance regime it falls into (Soft, Hybrid, or Mechanism-Reliant). We discuss the unique properties, applications, and design drivers for practical implementation of Soft Origami. We detail a theory of proper constraint by which an ideal soft structure’s number of degrees of freedom may be approximated as 3n, where n is the number of vertices of the fold pattern. Finally, we introduce a concept for a scalable process in which a few actuators and stretching membranes may be used to simultaneously fold many origami sub-structures that share common degrees of freedom.

Copyright © 2015 by ASME



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