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Related Concept Videos

Poisson's Ratio01:23

Poisson's Ratio

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Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
524
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.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
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Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Transformation of Plane Stress01:18

Transformation of Plane Stress

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Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
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A Polymer-based Piezoelectric Vibration Energy Harvester with a 3D Meshed-Core Structure
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3D Zero Poisson's Ratio Honeycomb Structure for Morphing Wing Applications.

Xiaobo Gong1, Chengwei Ren1, Jian Sun2

  • 1School of Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China.

Biomimetics (Basel, Switzerland)
|November 22, 2022
PubMed
Summary

A novel 3D Zero Poisson's Ratio (ZPR) honeycomb structure enables morphing aircraft wings. This structure exhibits unique ZPR properties and flexible morphing capabilities for enhanced flight efficiency.

Keywords:
3D ZPRZPRadaptive morphing structuremorphing structurezero Poisson’s ratio

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Area of Science:

  • Aerospace Engineering
  • Materials Science
  • Structural Mechanics

Background:

  • Morphing aircraft require adaptable aerodynamic shapes to expand flight envelopes and improve efficiency.
  • Existing structures often lack the necessary flexibility and isotropic deformation for advanced morphing applications.

Purpose of the Study:

  • To design and analyze a novel 3D Zero Poisson's Ratio (ZPR) honeycomb structure for morphing aircraft wings.
  • To investigate the mechanical properties and active deformation capabilities of the proposed ZPR honeycomb.

Main Methods:

  • Analytical modeling using the Timoshenko beam theory for stiffness analysis.
  • Quasi-static compression testing for experimental validation of the ZPR concept.
  • Integration of pneumatic muscle fibers as actuators for active shape control.

Main Results:

  • The 3D ZPR honeycomb demonstrated near-zero Poisson's ratio (average 0.0038), confirming its auxetic properties.
  • The structure exhibited isotropic deformation in three principal directions.
  • Active deformation achieved 14.4% contraction and up to 7.8° unidirectional bending under 0.4 MPa pressure.

Conclusions:

  • The developed 3D ZPR honeycomb structure is feasible and possesses unique properties suitable for morphing aircraft.
  • The combination of ZPR characteristics and active morphing capabilities presents a promising solution for next-generation morphing wings.