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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...

Design Example: Strain Gauge Bridge or Wheatstone Bridge

Design Example: Strain Gauge Bridge or Wheatstone Bridge

The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...

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Related Experiment Video

Updated: Sep 20, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Compliant Mechanism-Based Sensor for Large Strain Measurements Employing Fiber Optics.

Oleg Shiryayev¹, Nader Vahdati², Fook Fah Yap³

¹Department of Mechanical Engineering, ECB 301J, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, AK 99508, USA.

Sensors (Basel, Switzerland)

|June 10, 2022

Summary

This study introduces a novel sensor design using a compliant mechanism to measure large strains in soft materials. The sensor effectively attenuates strain, enabling accurate measurements for applications in wearables and soft robotics.

Keywords:

Fiber Bragg Gratings compliant mechanisms large deformations optical fiber strain

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Related Experiment Videos

Last Updated: Sep 20, 2025

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

Published on: September 30, 2019

Production of a Strain-Measuring Device with an Improved 3D Printer

Production of a Strain-Measuring Device with an Improved 3D Printer

Published on: January 30, 2020

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Area of Science:

Mechanical Engineering
Materials Science
Biomedical Engineering

Background:

Direct application of fiber optic strain gauges is limited by stiffness mismatch with soft structures.
Measuring large strains in compliant materials presents significant challenges.

Purpose of the Study:

To propose a novel sensor design for measuring large strains in structures with stiffness mismatch.
To develop and validate a sensor based on a compliant mechanism for strain attenuation.

Main Methods:

Design of a rhombus-type compliant mechanism to attenuate and transfer strain.
Development of an analytical model relating input strain to output strain.
Verification of the model using finite element analysis and experimental validation.

Main Results:

The sensor design successfully attenuates input strain.
The analytical model accurately predicts sensor performance.
The prototype sensor demonstrated capability to measure strains exceeding ±2.5 × 10⁵ µε.

Conclusions:

The proposed sensor design effectively measures large strains in challenging materials.
This technology has potential applications in soft robotics, wearables, and compliant elastomeric structures.