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Related Concept Videos

Bending of Curved Members - Neutral Surface01:16

Bending of Curved Members - Neutral Surface

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In curved beams, unlike straight beams, the stress distribution across the cross-section is not uniform due to the beam's curvature. This non-uniformity arises because the neutral axis, where stress is zero, does not align with the centroid of the section. In a curved beam, the strain varies along the section as a function of the distance from the neutral axis.
Consider the curved member described in the previous lesson. According to Hooke's law, which relates stress to strain within...
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
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Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Wood Panel Products01:18

Wood Panel Products

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Wood panel products are essential materials used in construction for applications such as flooring, siding, and roofing, typically available in standard dimensions of 4 feet by 8 feet, with thicknesses varying from one-quarter of an inch to one and one-eighth inches. Among the most common types of wood panels is plywood, which is produced by gluing multiple layers of thin wood veneers under pressure. The grain of the outer veneers runs lengthwise, while the grains of the interior layers run...
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
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Unsymmetric Loading of Thin-Walled Members01:23

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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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Thick-panel origami structures forming seamless surfaces.

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  • 1Department of Mechanical Engineering, National University of Singapore, Singapore, 117575, Singapore.

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This study introduces a novel origami method for thick panels, creating seamless deployable structures for various applications. The innovative design ensures motion compatibility and simplifies fabrication for enhanced functionality.

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Robotics

Background:

  • Thick-panel origami structures offer vast deployment capabilities for applications like stadium domes and space telescopes.
  • Current methods often result in structural complexities and non-seamless surfaces, hindering practical use.
  • Seamless surfaces are crucial for applications requiring watertight integrity or aesthetic continuity.

Purpose of the Study:

  • To develop a novel method for fabricating seamless thick-panel origami structures.
  • To ensure motion compatibility and analyze the kinematics of modified origami designs.
  • To propose a method for minimizing panel count for simplified fabrication and lightweight structures.

Main Methods:

  • Modifying valley-crease panels and extending adjacent panels to eliminate grooves.
  • Deriving geometric conditions for motion compatibility.
  • Analyzing the kinematics of the modified deployable structures.
  • Developing an approach to minimize the number of top panels.

Main Results:

  • Achieved seamless surfaces in thick-panel origami structures by eliminating grooves.
  • Established geometric conditions for ensuring motion compatibility in deployable systems.
  • Proposed and validated a method for reducing panel count, leading to simpler fabrication and lighter designs.
  • Successfully 3D-printed prototypes to demonstrate the feasibility of the developed concepts.

Conclusions:

  • The presented method enables the creation of seamless deployable origami structures from thick panels.
  • The kinematic analysis and geometric conditions ensure reliable motion and deployment.
  • The approach for panel reduction offers practical advantages in fabrication and weight for deployable systems.
  • This research provides a foundation for developing advanced, customizable, and functional deployable structures.