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Sequential Self-Folding Structures by 3D Printed Digital Shape Memory Polymers.

Yiqi Mao1, Kai Yu1, Michael S Isakov1

  • 1The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Scientific Reports
|September 9, 2015
PubMed
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Researchers developed sequential self-folding structures using 3D-printed digital shape memory polymers. These structures enable controlled shape-changing sequences activated by uniform temperature, offering precise deployment for various applications.

Area of Science:

  • Materials Science
  • Robotics
  • Engineering

Background:

  • Folding is a fundamental natural process with diverse technological applications, including deployable structures and self-assembling systems.
  • Current methods for controlled folding often require complex external mechanisms or pre-programmed sequences.

Purpose of the Study:

  • To demonstrate sequential self-folding structures using digital shape memory polymers activated by thermal stimuli.
  • To develop models for predicting and managing self-collisions in folding structures.

Main Methods:

  • Utilizing 3D printing to create spatially-variable patterns with digital shape memory polymers exhibiting distinct shape memory behaviors.
  • Applying uniform thermal activation to trigger time-dependent polymer responses for sequential shape changes.

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  • Developing finite element simulations and a simplified reduced-order model to analyze folding physics and predict self-collisions.

    • Main Results:

    • Successfully demonstrated 3D-printed structures that self-fold into specified shapes in controlled sequences upon thermal activation.
    • Experimental measurements of folding dynamics closely matched simulation predictions.
    • Developed a collision prediction metric integrated with a reduced-order model to design self-folding structures with stable configurations.

    Conclusions:

    • Digital shape memory polymers offer a novel approach for creating programmable, sequentially self-folding structures activated by simple thermal stimuli.
    • The developed models provide a framework for designing complex self-folding systems that avoid self-collisions and achieve desired final configurations.
    • This technology has potential applications in areas requiring deployable and reconfigurable structures, such as aerospace, robotics, and biomedical devices.