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Related Concept Videos

Introduction to Structures01:30

Introduction to Structures

1.0K
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...
1.0K
Steel Fastening Techniques01:17

Steel Fastening Techniques

138
Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...
138
Stability of structures01:14

Stability of structures

157
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
157
Applications of Stress01:04

Applications of Stress

250
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
250
Posttensioned Masonry Walls01:15

Posttensioned Masonry Walls

129

Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
Following the curing process, the tensioning begins. Steel rods are...
129
Indeterminate Structure01:18

Indeterminate Structure

507
Indeterminate structures refer to structures where internal forces and reactions cannot be determined using only the equations of static equilibrium.  Indeterminate structures have more unknown forces and reaction forces than equations of static equilibrium that can be used to determine them. Indeterminate structures are often used in engineering to create complex, efficient, and aesthetically pleasing structures. There are various types of indeterminate structures used in engineering and...
507

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Related Experiment Video

Updated: Jun 11, 2025

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
06:34

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes

Published on: January 6, 2023

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Self-locking and stiffening deployable tubular structures.

Ting-Uei Lee1, Hongjia Lu1, Jiaming Ma1

  • 1Centre for Innovative Structures and Materials, School of Engineering, RMIT University, Melbourne, VIC 3001, Australia.

Proceedings of the National Academy of Sciences of the United States of America
|September 27, 2024
PubMed
Summary
This summary is machine-generated.

Origami-inspired deployable tubes balance flexibility and stiffness using a novel self-locking mechanism. This design enables programmable structural performance for advanced engineering applications.

Keywords:
deployable tubular structureselastic shell bucklingorigami-inspired mechanismsself-locking

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Robotics

Background:

  • Deployable tubular structures are vital for adaptive engineering solutions.
  • A key challenge is achieving both expandability and stiffness.
  • Compliant materials offer flexibility but often lack stiffness under load.

Purpose of the Study:

  • To develop a deployable tubular structure that overcomes the stiffness-expandability trade-off.
  • To introduce a novel self-locking mechanism for enhanced structural performance.
  • To enable programmable and direction-dependent structural behavior.

Main Methods:

  • Utilized origami-inspired techniques and internal stiffeners.
  • Developed a self-locking mechanism combining curved-crease origami and elastic shell buckling.
  • Employed simple shell components and internal diaphragms for snap-through transitions.

Main Results:

  • Achieved a self-locked deployed tube via geometrical interference, forming a braced tubular arrangement.
  • Demonstrated direction-dependent structural performance, from elastic response to crushing.
  • Showcased potential for programmable structures with diverse applications.

Conclusions:

  • The proposed origami-inspired design successfully balances expandability and stiffness in deployable tubes.
  • The self-locking mechanism offers a pathway to programmable structural performance.
  • This approach can advance existing deployment systems and inspire new structural designs.