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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...
Shearing Strain01:20

Shearing Strain

The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
Shearing Stress01:18

Shearing Stress

Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
The average shearing stress can be calculated by dividing the shear by the area of the cross-section.
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...
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...
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...

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Updated: Jun 27, 2026

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
09:29

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens

Published on: January 24, 2016

A new mark shearing technique for strain measurement using digital image correlation method.

Tao Hua1, Huimin Xie, Bing Pan

  • 1FML, Department of Engineering Mechanics, Tsinghua University, 100084 Beijing, China.

The Review of Scientific Instruments
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

A novel mark shearing technique enhances the accuracy of strain measurement in digital image correlation (DIC) for experimental mechanics. This method improves precision for both large and small specimens, achieving an accuracy of 4 microm strains.

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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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07:59

Intermediate Strain Rate Material Characterization with Digital Image Correlation

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Area of Science:

  • Experimental Mechanics
  • Optical Measurement Techniques

Background:

  • Digital Image Correlation (DIC) is a widely used noncontact, full-field method for measuring surface deformation.
  • While DIC offers high precision in displacement measurement, its accuracy in strain determination is limited.

Purpose of the Study:

  • To introduce a new mark shearing technique to improve the accuracy of strain measurement in DIC.
  • To enhance the adaptability of DIC for various specimen scales.

Main Methods:

  • A wedge mirror is employed to introduce a shearing distance to marks on the specimen.
  • The measurement principle of the mark shearing technique is detailed.
  • A tensile experiment using an aluminum sample was performed to validate the method.

Main Results:

  • The mark shearing technique demonstrates suitability for both large-scaled and small-scaled specimens.
  • The method achieves a maximum gauge length of 80 mm.
  • Strain measurement accuracy reaches up to 4 microm strains.

Conclusions:

  • The proposed mark shearing technique significantly improves strain measurement accuracy in DIC.
  • This method offers wider adaptability compared to common DIC techniques.
  • Experimental validation confirms the feasibility and effectiveness of the mark shearing technique.