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Related Concept Videos

Shear Diagram01:27

Shear Diagram

1.3K
In the study of beam mechanics, shear diagrams play a crucial role in understanding the distribution of shear forces along the length of a beam. Consider a beam AB that is supported at both ends and subjected to perpendicular loads.
First, a free-body diagram of the beam is drawn, representing all the external forces and internal reactions acting on the beam. One can calculate the reaction forces at each support by employing the equilibrium equations of force and moment. The vertical component...
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Phase Contrast and Differential Interference Contrast Microscopy01:26

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Shearing Strain01:20

Shearing Strain

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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...
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Related Experiment Video

Updated: Nov 24, 2025

Visualization of Failure and the Associated Grain-Scale Mechanical Behavior of Granular Soils under Shear using Synchrotron X-Ray Micro-Tomography
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Spatial-light-modulator-based dual shearing direction shearography.

Boyang Zhang, Fangyuan Sun, Lei Yang

    Applied Optics
    |December 28, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A new dual shearing shearography system uses a spatial light modulator (SLM) for improved non-destructive testing (NDT). This system offers high light efficiency and excellent phase map quality for accurate strain measurement.

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    Area of Science:

    • Optics
    • Materials Science
    • Mechanical Engineering

    Background:

    • Digital shearography is a key non-destructive testing (NDT) method for whole-field strain measurement.
    • Current methods, like spatial phase shift shearography, face limitations in light efficiency and phase map quality.
    • Measuring strain in multiple directions often requires complex setups.

    Purpose of the Study:

    • To introduce a novel dual shearing shearography system utilizing a spatial light modulator (SLM).
    • To overcome the limitations of existing shearography techniques, particularly spatial phase shift methods.
    • To enhance the efficiency and accuracy of strain measurement and defect detection in NDT.

    Main Methods:

    • Development of a dual shearing shearography system incorporating an SLM for high-speed temporal phase shifting.
    • Implementation of programmable and adjustable shearing directions and distances using the SLM.
    • Detailed theoretical derivation and experimental validation of the SLM-based system.

    Main Results:

    • The proposed SLM-based system demonstrates simple structure, high light efficiency, and superior phase map quality.
    • Achieved fast temporal phase shifting and shearing direction switching due to the SLM's high-speed response.
    • Successfully applied the system for non-destructive testing, validating its effectiveness in strain measurement.

    Conclusions:

    • The SLM-based dual shearing shearography system offers significant advantages over traditional methods for NDT.
    • The system's flexibility in programmable shearing directions and high efficiency make it suitable for diverse strain measurement applications.
    • This technology advances the field of optical non-destructive testing with improved performance and versatility.