17 February 1987 Moire Strain Contours Of Crack-Tip Deformation
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In this paper, deformed cross gratings around crack-tip are recorded. The derivative fields of displacements (∂u/∂x, ∂u/∂y, ∂v/∂x, ∂v/∂y, ∂w/∂x ∂w/∂y) are obtained by optical spatial filtering of two shifted deformed gratings. From which, strain contours around crack-tips can be obtained directly.
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B. C. Liu, B. C. Liu, S. Li, S. Li, F. P. Chiang, F. P. Chiang, } "Moire Strain Contours Of Crack-Tip Deformation", Proc. SPIE 0814, Photomechanics and Speckle Metrology, (17 February 1987); doi: 10.1117/12.941709; https://doi.org/10.1117/12.941709

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