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Introduction to Structures

Introduction to Structures

A structure is defined as a system of interconnected members designed to support or transfer forces and successfully withstand the loads acting on them. The internal forces of a structure can be determined by decomposing the structure and analyzing the free-body diagrams of the individual members or of a combination of members. This helps in understanding the structural elements' behavior and ensuring that the structure is stable and can withstand the subjected loads.
There are three main...

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Related Experiment Video

Updated: Jan 10, 2026

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles

Origami Inspired Self-assembly of Patterned and Reconfigurable Particles

Published on: February 4, 2013

Foldable and rollable interlaced structure for deployable robotic systems.

Sun-Pill Jung¹, Jaeyoung Song¹, Chan Kim¹

¹Biorobotics Laboratory, Soft Robotics Research Center, Institute of Advanced Machines and Design, Department of Mechanical Engineering, Institute of Engineering, Seoul National University, Seoul 08826, Republic of Korea.

Science Robotics

|November 26, 2025

Summary

This summary is machine-generated.

This study introduces a novel corrugated sheet design for deployable structures. This foldable, interlaced origami approach enables compact fold-and-roll storage while maintaining high stiffness and strength in extended configurations.

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Area of Science:

Robotics
Materials Science
Mechanical Engineering

Background:

Extendable structures commonly use rollable designs for compact storage.
Achieving high stiffness and strength in extended states with compact storage is a significant engineering challenge.

Purpose of the Study:

To develop a novel foldable design for extendable structures that balances compactness, stiffness, and strength.
To enable efficient fold-and-roll storage without compromising structural integrity.

Main Methods:

Introduction of a corrugated sheet-shaped foldable design using Z-folding of parallel strips.
Formation of an interlaced origami structure via a ribbon-weaving technique.
Development of deployable mobile robots utilizing the novel structure.

Main Results:

The corrugated structure provides high load-bearing capacity in its extended state.
The interlaced design allows for localized flexibility and mutual constraints, enabling smooth rolling onto a compact hub.
Demonstrated application in two deployable robots: a 1.6-meter robotic arm and a meter-scale 3D-printing system.

Conclusions:

The interlaced, corrugated approach offers a viable solution for deployable robotic systems.
This design successfully integrates compactness, strength, and flexibility for advanced applications.