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Related Concept Videos

Measurements of Strain01:27

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: May 28, 2026

Measurement of Compressive Stress-Strain Response at Small-Strains
02:58

Measurement of Compressive Stress-Strain Response at Small-Strains

Published on: December 5, 2025

Micromechanical testing with microstrain resolution.

D J Dunstan1, J U Gallé, B Ehrler

  • 1School of Physics, Queen Mary University of London, London E1 4NS, England. d.dunstan@qmul.ac.uk

The Review of Scientific Instruments
|October 7, 2011
PubMed
Summary
This summary is machine-generated.

New equipment accurately measures the elastic limit and plastic deformation in thin metal materials. This enables precise analysis of material behavior under stress, even at microscopic strain levels.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Understanding the mechanical properties of thin materials is crucial for advanced engineering applications.
  • Characterizing elastic limit and plastic deformation informs material selection and design.
  • Existing methods may lack the sensitivity for micro-scale strain analysis.

Purpose of the Study:

  • To develop and present simple, yet accurate, test equipment for evaluating thin metal wires and foils.
  • To enable the study of elastic and plastic deformation under various stress conditions.
  • To achieve high-precision measurements of small plastic strain values.

Main Methods:

  • Development of specialized test equipment for torsion, tension, and bending.
  • Utilization of load-unload methodologies to probe material response.
  • Employing long gauge lengths (up to 1 meter) for enhanced sensitivity.
  • Testing of thin metal specimens, including wires and foils down to 10 μm thickness.

Main Results:

  • Successful development of functional test equipment.
  • Demonstrated capability to study elastic limit and plastic deformation.
  • Accurate measurement of plastic strain as low as 10⁻⁶.
  • Applicability to thin metal wires and foils across multiple loading modes.

Conclusions:

  • The developed equipment provides a simple and accurate means to study micro-scale plastic deformation in thin materials.
  • This advancement facilitates more precise material characterization for engineering design.
  • The load-unload method with long gauge lengths is effective for sensitive strain measurement.