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Related Concept Videos

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
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...
Color Vision01:24

Color Vision

Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

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Related Experiment Video

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Direct Linear Transformation for the Measurement of In-Situ Peripheral Nerve Strain During Stretching
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Measurement of transient deformation by color encoding.

C Mares1, B Barrientos, A Blanco

  • 1Centro de Investigaciones en Óptica A. C., Loma del Bosque 115, León, Gto. Mexico.

Optics Express
|January 26, 2012
PubMed
Summary

This study introduces a novel color encoding method for measuring 3D deformation in diffuse objects. The technique accurately quanties in-plane and out-of-plane displacements using separated color channels for enhanced precision.

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Area of Science:

  • Optical Measurement
  • Mechanical Engineering
  • Materials Science

Background:

  • Accurate measurement of transient 3D deformation is crucial in various engineering fields.
  • Existing methods may face limitations in precision or complexity for diffuse objects.

Purpose of the Study:

  • To develop and validate a high-accuracy method for measuring transient 3D deformation in diffuse objects.
  • To leverage color encoding for separating displacement components.

Main Methods:

  • Illumination of the object with structured light featuring a cyan fringe pattern on a white background.
  • Registration and separation of color channels (blue for surface features, red for fringes).
  • Calculation of in-plane displacement using digital correlation and out-of-plane displacement from fringe patterns.

Main Results:

  • Successful separation of surface features and fringe information into distinct color channels.
  • Accurate quantification of both in-plane and out-of-plane displacement components.
  • High accuracy demonstrated through displacement measurements on an aluminum plate.

Conclusions:

  • The proposed color encoding method offers a precise and reliable approach for 3D deformation measurement.
  • Avoiding signal cross-talk between color channels ensures high measurement accuracy.
  • The method is validated for practical applications in transient deformation analysis.