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Measurements of Strain

Measurements of Strain

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...

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Biaxial flexible frequency-selective surface strain sensor with crack self-detection function.

Xin Wang, Tao Zhou, Junlin Wang

|November 11, 2025

Summary

This summary is machine-generated.

This study introduces a novel dual-axis flexible frequency-selective surface (FSS) sensor for structural health monitoring. The sensor not only measures biaxial strain but also self-detects cracks, enhancing infrastructure safety.

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Last Updated: Jan 11, 2026

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Area of Science:

Electrical Engineering
Materials Science
Civil Engineering

Background:

Traditional strain sensors face limitations like complex wiring and susceptibility to interference.
Flexible frequency-selective surface (FSS) sensors offer wireless capabilities but are vulnerable to physical damage, such as cracks.

Purpose of the Study:

To develop a dual-axis flexible FSS sensor with integrated crack self-detection capabilities.
To enhance the reliability and safety of structural health monitoring systems.

Main Methods:

Design and simulation of a centrally symmetric patch structure FSS sensor operating in the Ka band.
Experimental validation of biaxial strain sensing and crack self-detection under various conditions.
Testing sensor performance under multi-crack scenarios and 500 fatigue cycles.

Main Results:

The sensor operates at 32.832 GHz with polarization-insensitive characteristics.
Biaxial strain sensing demonstrated sensitivities of 700 MHz/mm (uniaxial), 1155 MHz/mm (x-polarization), and 1260 MHz/mm (y-polarization).
Effective self-detection of horizontal and vertical cracks via distinct frequency shifts (redshift), independent of crack position or width.

Conclusions:

The proposed dual-axis flexible FSS sensor successfully integrates strain sensing and crack self-detection.
The sensor exhibits robust mechanical stability and reliable self-detection capabilities, even under complex damage.
This technology offers a promising solution for advanced structural health monitoring.