Two-dimensional Moiré phase analysis for accurate strain distribution measurement and application in crack prediction.
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TLDR
A two-dimensional (2D) Moiré phase analysis method is proposed for full-field deformation measurement with high accuracy and dynamic deformation is measurable from automatic batch processing of single-shot grid images.Abstract:
Aimed at the low accuracy problem of shear strain measurement in Moire methods, a two-dimensional (2D) Moire phase analysis method is proposed for full-field deformation measurement with high accuracy. A grid image is first processed by the spatial phase-shifting sampling Moire technique to get the Moire phases in two directions, which are then conjointly analyzed for measuring 2D displacement and strain distributions. The strain especially the shear strain measurement accuracy is remarkably improved, and dynamic deformation is measurable from automatic batch processing of single-shot grid images. As an application, the 2D microscale strain distributions of a titanium alloy were measured, and the crack occurrence location was successfully predicted from strain concentration.read more
Citations
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Comparative study of sampling moiré and windowed Fourier transform techniques for demodulation of a single-fringe pattern
TL;DR: This paper evaluates the phase extraction errors of SM and windowed Fourier ridges as a typical WFT method for both linear and nonlinear phases with/without noise against the reference Fourier transform (FT) technique.
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Optical full-field strain measurement method from wrapped sampling Moiré phase to minimize the influence of defects and its applications
TL;DR: In this article, a simple local phase unwrapping algorithm was proposed to minimize the influence of defects on full-field strain measurement, where the Moire phases are first acquired by the sampling Moire technique, and the wrapped Moire phase difference is then calculated to determine the strain distributions by only unwrap the phase difference at the boundaries of the wrapped phase.
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Crystallographic selection rule for the propagation mode of microstructurally small fatigue crack in a laminated Ti-6Al-4V alloy: Roles of basal and pyramidal slips
TL;DR: In this article, the microstructurally small fatigue crack growth (FCG) in a fully laminated Ti-6Al-4V alloy was investigated, where the basal plane was aligned approximately parallel to the notch/crack surface.
Journal ArticleDOI
A novel sampling moiré method and its application for distortion calibration in scanning electron microscope
TL;DR: In this article, a direct sampling moire method (DSM) was developed for simple and fast analysis of grating distortion in high-resolution scanning electron microscope (SEM) images.
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Visualization and automatic detection of defect distribution in GaN atomic structure from sampling Moiré phase.
TL;DR: A Fourier transform filtered sampling Moiré technique was proposed to visualize and detect defects in atomic arrays in a large field of view and is able to provide valuable references to material scientists and engineers by checking the effect of various treatments for defect reduction.
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