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Area of Science:

  • Mechanics of Materials
  • Origami Engineering
  • Soft Robotics

Background:

  • Origami structures exhibit unique mechanical properties.
  • Negative stiffness is a key characteristic in certain folding behaviors.
  • Programmable mechanical responses are desirable for advanced applications.

Purpose of the Study:

  • To report a novel collapse mechanism in origami solids.
  • To investigate the role of negative stiffness in this mechanism.
  • To explore the potential applications of this phenomenon.

Main Methods:

  • Fabrication of origami solids using stacked, pressurized cells.
  • Analysis of folding behavior and negative stiffness.
  • Demonstration of pressure-controlled collapse and recovery.

Main Results:

  • A unique, recoverable collapse mechanism was identified.
  • The mechanism relies on the negative stiffness of the folded origami sheets.
  • Programmability was achieved through pressure control and crease pattern design.

Conclusions:

  • The reported collapse mechanism is recoverable and programmable.
  • This mechanism offers potential for applications like energy absorption.
  • The findings open new avenues in the study of origami nonlinear mechanics.