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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.5K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.5K
Transformation of Plane Strain01:12

Transformation of Plane Strain

437
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
437
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

534
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
534
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

480
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.
480
Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

424
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
424
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

435
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
435

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Related Experiment Video

Updated: Dec 27, 2025

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

Published on: May 23, 2017

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Dual-Axis Metasurface Strain Sensor Based on Polarization-Phase-Deformation Relationship.

Zhiwei Sun1, Run Liu1, Hailin Cao1,2

  • 1Chongqing Key Laboratory of Space Information Network and Intelligent Information Fusion, Chongqing University, Chongqing 400044, China.

Sensors (Basel, Switzerland)
|March 4, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel metasurface (MS) for highly sensitive dual-axis strain sensing. The flexible MS demonstrates significant phase shifts for precise deformation measurement in the microwave band, with potential applications in pressure and tensile sensing.

Keywords:
deformation predictionflexible metasurfacephase-polarization relationshipstrain-sensing

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Last Updated: Dec 27, 2025

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Area of Science:

  • Metamaterials and Nanophotonics
  • Electromagnetics and Optics
  • Sensor Technology

Background:

  • Metasurfaces (MS) offer unique electromagnetic properties for sensing applications.
  • Improving the sensitivity and accuracy of dual-axis strain sensing remains a key challenge.
  • Deformation-induced phase shifts in MS are crucial for sensing mechanisms.

Purpose of the Study:

  • To propose and demonstrate a novel approach for enhancing the sensitivity of dual-axis strain sensing.
  • To design and fabricate a flexible metasurface for precise strain measurement.
  • To evaluate the performance of the metasurface in the microwave band.

Main Methods:

  • Utilizing the sharp phase response of a metasurface to its deformation.
  • Calculating multi-polarized reception for phase measurement with anisotropic incident electromagnetic (EM) waves.
  • Designing and fabricating a flexible metasurface with periodically arranged lantern-shaped elements.
  • Conducting simulations and experimental measurements for performance evaluation.

Main Results:

  • The proposed metasurface exhibits high sensitivity for dual-axis strain sensing in the microwave band.
  • The method demonstrated feasible phase measurement through multi-polarized reception.
  • The flexible metasurface successfully detected strain with high precision.

Conclusions:

  • The developed metasurface-based approach significantly improves dual-axis strain sensing sensitivity.
  • The method shows potential for both pressure and tensile sensing applications.
  • The operational frequency can be extended to THz and optical bands, broadening applicability.