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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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Related Experiment Video

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

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Comprehensive Optical Strain Sensing Through the Use of Colloidal Quantum Dots.

Michael D Sherburne¹, Candice R Roberts², John S Brewer²

¹Department of Electrical and Computer Engineering, Air Force Institute of Technology, Dayton, Ohio 45433, United States.

ACS Applied Materials & Interfaces

|September 3, 2020

Summary

Colloidal quantum dots in a polymer act as an optical strain gauge for nondestructive testing. This novel technique shows promise for monitoring structures, especially in harsh environments.

Keywords:

nanomaterials nondestructive testing (NDT)quality control quantum dots strain stress

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Last Updated: Dec 10, 2025

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

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Published on: January 30, 2020

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

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Published on: May 23, 2017

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

Area of Science:

Materials Science
Nanotechnology
Mechanical Engineering

Background:

Colloidal quantum dots (CQDs) exhibit unique optical properties sensitive to mechanical strain.
Nondestructive testing (NDT) requires advanced techniques for structural health monitoring.

Purpose of the Study:

To investigate the use of InP/ZnS colloidal quantum dots within a polymer matrix as an optical strain gauge for NDT.
To evaluate the correlation between optically measured strain and mechanically measured stress-strain data.

Main Methods:

InP/ZnS CQDs were incorporated into a polymer matrix.
The polymer-CQD composite was applied to an epoxy-coated dog-bone foil specimen.
Optical strain measurements were correlated with mechanical stress-strain data using an empirical formula and calibration factor.

Main Results:

A close correlation was observed between calculated optical strain and reference mechanical stress-strain data.
Observed fluctuations in optical strain may be attributed to unmeasured strain responses and quantum dot blinking.

Conclusions:

The developed polymer-CQD composite serves as a viable optical strain gauge for NDT applications.
This novel optical NDT technique is suitable for various structures, particularly those in demanding environments.