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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 gauge...

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Related Experiment Video

Updated: Jun 20, 2026

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

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

Published on: May 23, 2017

Measurement of difference deformation using speckle interferometry.

P K Rastogi¹, P Jacquot

¹Laboratory of Stress Analysis, Swiss Federal Institute of Technology, Lausanne, CH-1015 Lausanne, Switzerland.

|September 11, 2009

Summary

This summary is machine-generated.

This study introduces speckle interferometry to compare stress resistance in identical specimens. The technique reveals displacement differences, demonstrating its feasibility with loaded plates.

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Area of Science:

Optical Metrology
Materials Science
Mechanical Engineering

Background:

Comparing material stress resistance is crucial for quality control and performance assessment.
Traditional methods may lack precision or require destructive testing.

Purpose of the Study:

To present a novel application of speckle interferometry for comparative stress analysis.
To enable non-destructive evaluation of stress resistance between nominally identical specimens.

Main Methods:

Speckle interferometry was employed to analyze stress-induced displacements.
Interference patterns were generated to map equal displacement differences.
Experimental validation involved comparing deflections of clamped square plates under concentrated loads.

Main Results:

The speckle interferometry method successfully generated displacement difference contours.
Experimental results demonstrated the technique's ability to differentiate subtle mechanical responses.
The deflections of two identically loaded plates were quantitatively compared.

Conclusions:

Speckle interferometry offers a viable, non-contact method for comparing stress resistance.
The technique provides valuable insights into material uniformity and structural integrity.
This approach enhances comparative analysis in materials testing and engineering applications.