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Moire patterns formed by line gratings
Moire patterns formed by circular radial
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amplitude angle angular displacement anticlastic antinodal applied axes axis boundary camera centre circular gratings collimated light components of strain corresponding crossed grating curvature cylindrical deformation density derived diffraction gratings disparity distance elastic equal equation evaluation experimental extensometer Figure film flexed plates frequency gauge length given grating RG ground-glass screen illumination image moire method indicial equation initial moire pattern intensity interference interfringe spacing light source Liiders line gratings linear lines per inch magnification measurement Mech moire fringes formed moire pattern formed nodal normal obtained optical parallel partial slope contours Perspex photoelastic photographic pitch plane stress plastic Poisson's ratio position principal direction principal stresses radial gratings radius ratio reference grating relation rotation rulings shear strain shell shock wave shows the moire slit slope distribution specimen grating strain components strain distribution strain field superposed superposition technique Theocaris tion values variation width yield zero zone gratings