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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...
Transformation of Plane Strain01:12

Transformation of Plane Strain

When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
Mohr's circle visually represents the strain states under various conditions, which is essential for understanding material behavior. The center of Mohr's...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...

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Related Experiment Video

Updated: Jun 6, 2026

Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
06:56

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

Published on: May 23, 2017

Interferometric 45° and 60° strain rosettes measuring.

K Li

    Applied Optics
    |November 10, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel laser-based interferometric strain rosette technique measures three in-plane strains using microindentations. This method analyzes changes in laser interference fringe patterns to quantify material deformation accurately.

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    Last Updated: Jun 6, 2026

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    Area of Science:

    • Materials Science
    • Optical Metrology
    • Experimental Mechanics

    Background:

    • Accurate measurement of in-plane strains is crucial for understanding material behavior under stress.
    • Traditional strain measurement methods can be complex and may require surface preparation.

    Purpose of the Study:

    • To introduce a new laser-based technique for measuring three in-plane strains.
    • To present the design and principles of interferometric strain rosettes.

    Main Methods:

    • Utilized three microindentations on a specimen surface arranged in 45° or 60° rosette patterns.
    • Employed laser illumination to generate Young's interference fringe patterns from pairs of indentations.
    • Monitored fringe spacing changes using linear-array diodes and a microcomputer system for real-time data acquisition.

    Main Results:

    • Demonstrated that fringe spacing changes are inversely proportional to indentation separation changes caused by strain.
    • Successfully obtained three strain components in the directions of the indentation pairs.
    • The technique offers a non-contact method for strain analysis.

    Conclusions:

    • The interferometric strain rosette is an effective method for measuring three in-plane strains.
    • This laser-based approach provides a sensitive and real-time strain measurement capability.
    • The technique is adaptable for different rosette configurations (45° and 60°).