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THE ANALYSIS OF STRAIN
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amplitude analyser applied beam bending biaxial birefringence body circularly polarized light coincide colour corresponding cos2 crystal deformation denoted determined direction of observation displacement dynamic edge effect elastic elastic modulus element ellipse ellipsoid equal equations of equilibrium film forces acting fringe order frozen stress index ellipsoid intensity intersection investigation isochromatic pattern isoclinics isopachics isotropic point length lines of constant lines xxy maximum measured method model materials modulus Mohr's circle nomogram normal stresses obtained optic axis parallel parameter path difference phase difference photoelastic photoelastic effect photomultiplier plastic Poisson's ratio polariscope polaroids position principal axes principal stresses problems procedure produced quarter-wave plate ratio rays reflected refractive index relative retardation represented respectively rotated scattered light secondary principal stresses shear force shear stress shown in Figure sin2 strain stress distribution stress trajectories surface symmetry temperature thickness tip curve transmission transmitted transverse two-dimensional uniaxial values vector velocity vibration wavelength zero