研究目的
To examine the case of the checkerboard pattern for measuring displacements and strains, comparing its performance with classic 2D grids in terms of noise level in displacement and strain maps.
研究成果
Checkerboard images processed with LSA provide less noisy displacement and strain maps compared to classic 2D grids. The technique is effective for measuring low strain levels with high gradients, as demonstrated in a tensile test on a notched specimen.
研究不足
The method is restricted to 2D measurements, and its extension to out-of-plane measurements should be investigated. Aliasing in images requires careful control, and the presence of defects in the pattern can affect the final strain maps.
1：Experimental Design and Method Selection:
The study employs a Fourier-based technique, Localized Spectrum Analysis (LSA), to process checkerboard images for displacement and strain field extraction. Two procedures are proposed for processing checkerboard images with LSA.
2：Sample Selection and Data Sources:
Checkerboard and 2D grid patterns are deposited on specimens. Images are captured using a Sensicam CCD camera for translation tests and a PCO 2000 camera for a tensile test on a notched specimen.
3：List of Experimental Equipment and Materials:
Sensicam CCD camera, PCO 2000 camera, LED light sources, Zwick-Roell tensile machine.
4：Experimental Procedures and Operational Workflow:
Translation tests are performed to compare noise levels in displacement and strain maps from checkerboard and 2D grid images. A tensile test on a notched specimen is conducted to measure high strain gradients at low strain levels.
5：Data Analysis Methods:
Displacement and strain fields are derived from phase changes between current and reference images using LSA. Noise levels are compared between checkerboard and 2D grid patterns.
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