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Related Concept Videos

Measurements of Strain01:27

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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...
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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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Full-field stress measuring method based on terahertz time-domain spectroscopy.

Kai Kang, Yufeng Du, Shibin Wang

    Optics Express
    |November 23, 2021
    PubMed
    Summary

    We developed a new method to measure internal material stress using terahertz time-domain spectroscopy. This technique offers a non-destructive way to analyze stress distributions in optically opaque materials.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Solid Mechanics

    Background:

    • Terahertz (THz) waves offer unique penetration capabilities for optically opaque materials.
    • Non-destructive internal stress measurement is crucial for material integrity assessment.
    • Existing methods may have limitations in full-field stress analysis.

    Purpose of the Study:

    • To propose and validate a novel full-field stress measuring method utilizing terahertz time-domain spectroscopy (THz-TDS).
    • To establish a theoretical framework based on the stress-optical law for THz wave interaction with stressed materials.
    • To experimentally demonstrate the capability of THz-TDS for quantitative stress distribution mapping.

    Main Methods:

    • Development of a theoretical model linking stress and THz wave propagation based on the stress-optical law.
    • Experimental determination of the stress-optical coefficient using a four-point bending test.
    • Application of the THz-TDS method to measure stress distribution in a diametrically loaded disk specimen.

    Main Results:

    • The theoretical model successfully describes the stress-optic effect in the context of THz-TDS.
    • Experimental validation confirmed the feasibility of the proposed full-field stress measurement technique.
    • Measured stress distributions showed good agreement with theoretical predictions for the loaded disk.

    Conclusions:

    • Terahertz time-domain spectroscopy provides a viable non-destructive method for full-field internal stress measurement.
    • The established theoretical model and experimental validation support the use of THz-TDS in material stress analysis.
    • This technique has potential applications in quality control and structural health monitoring of materials.