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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes
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Stereo sampling moiré method for three-dimensional deformation mapping with a stereomicroscope.

Qinghua Wang, Shigesato Okumura, Shien Ri

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    Summary

    This study introduces a stereo sampling moiré method for precise 3D deformation measurement using a stereomicroscope. The technique accurately captures microscopic 3D displacements and in-plane strains in materials.

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    Area of Science:

    • Materials Science
    • Optical Metrology
    • Experimental Mechanics

    Background:

    • Accurate three-dimensional (3D) deformation measurement is crucial for materials evaluation.
    • Existing methods may lack the precision or full-field capabilities required for microscopic analysis.
    • Stereomicroscopes offer high magnification but require specialized techniques for quantitative 3D deformation analysis.

    Purpose of the Study:

    • To develop and validate a novel stereo sampling moiré method for full-field 3D deformation measurement using a stereomicroscope.
    • To enable the acquisition of 3D displacements and in-plane strains at the microscopic level.
    • To introduce a calibration method for the microscope convergence angle.

    Main Methods:

    • A stereo sampling moiré technique was implemented using a stereomicroscope.
    • Phase analysis was performed on left and right image planes to determine displacements.
    • A calibration method utilizing grid pitch variation was developed for the microscope convergence angle.

    Main Results:

    • The proposed method successfully acquired microscopic 3D displacements and in-plane strain distributions.
    • Validation experiments demonstrated high accuracy, with out-of-plane displacement measurement differences less than 0.2 µm compared to the sample stage movement.
    • The study investigated the deformation behavior of a carbon fiber reinforced plastic specimen under a three-point bending test.

    Conclusions:

    • The stereo sampling moiré method provides a robust and accurate approach for full-field 3D deformation measurement at the microscopic scale.
    • The developed technique is suitable for analyzing complex materials like carbon fiber reinforced plastics.
    • This method enhances the capability for detailed materials evaluation through precise strain and displacement mapping.