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Related Concept Videos

Stability of structures01:14

Stability of structures

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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,...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Kirigami-based metastructures with programmable multistability.

Xiao Zhang1, Jiayao Ma1, Mengyue Li1

  • 1School of Mechanical Engineering, Tianjin University, Tianjin 300072, China.

Proceedings of the National Academy of Sciences of the United States of America
|March 7, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel tristable kirigami cuboid, a versatile multistable structure. This programmable metamaterial enables tunable mechanical behaviors and has applications in reconfigurable antennas for 5G communication.

Keywords:
kirigami cuboidmetastructuremultistabilityprogrammability

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Area of Science:

  • Mechanics of Materials
  • Metamaterials Science
  • Kirigami Structures

Background:

  • Existing multistable structures often rely on combining bistable units.
  • A need exists for simpler, more versatile multistable designs with distinct stable states.

Purpose of the Study:

  • To introduce a generic tristable kirigami cuboid as a novel multistable structure.
  • To demonstrate the programmability and potential applications of this new design.

Main Methods:

  • Design and fabrication of a tristable kirigami cuboid unit.
  • Investigation of transformation mechanisms via tension/compression and twisting.
  • Tessellation of units to create multistable metamaterials.
  • Development and experimental verification of a frequency reconfigurable antenna.

Main Results:

  • The tristable kirigami cuboid exhibits three distinct stable states with unique geometric configurations and chirality.
  • Transformations between states are achievable through mechanical loading (tension/compression) or twisting.
  • Programmable mechanical behaviors of the resulting metamaterials are demonstrated.
  • A functional frequency reconfigurable antenna for 5G triple-band communication was successfully developed and tested.

Conclusions:

  • The tristable kirigami cuboid represents a significant advancement in multistable structure design.
  • This platform offers a versatile approach to creating programmable metamaterials with tunable properties.
  • The demonstrated antenna application highlights the practical potential in advanced communication systems.