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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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DIC/Moiré hybrid method based on regular patterns for deformation measurement.

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    This study introduces a novel Digital Image Correlation (DIC)/Moiré hybrid method using regular patterns for precise surface deformation measurement. This approach enhances computational efficiency and accuracy compared to traditional random pattern DIC methods.

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    Area of Science:

    • Optical Measurement
    • Mechanical Engineering
    • Materials Science

    Background:

    • Digital Image Correlation (DIC) is a key optical technique for high-accuracy surface deformation measurement.
    • Current DIC research predominantly utilizes random patterns, which can limit computational efficiency and accuracy.
    • Developing advanced methods for precise deformation analysis is crucial in various engineering fields.

    Purpose of the Study:

    • To propose and evaluate a novel DIC/Moiré hybrid method for deformation measurement.
    • To investigate the use of regular patterns in conjunction with Moiré fringe techniques for improved DIC performance.
    • To compare the computational efficiency and accuracy of the proposed hybrid method against conventional DIC.

    Main Methods:

    • A hybrid approach combining Digital Image Correlation (DIC) with the Moiré fringe technique was developed.
    • A Moiré fringe technique utilizing a correlation coefficient was implemented to obtain accurate initial deformation estimations for DIC.
    • Regular patterns were employed instead of traditional random patterns for deformation measurement.

    Main Results:

    • The proposed DIC/Moiré hybrid method demonstrated higher computational efficiency compared to conventional DIC.
    • Experimental results indicated an increase in calculation accuracy when using regular patterns with the hybrid method.
    • The method successfully provided accurate initial deformation estimations, facilitating potential applications in deformation measurements.

    Conclusions:

    • The DIC/Moiré hybrid method using regular patterns offers superior computational efficiency and accuracy for surface deformation measurement.
    • The accurate initial estimation provided by the Moiré fringe technique is a significant advantage.
    • This hybrid approach shows promise for advanced applications in deformation analysis and measurement.