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accuracy adhesive alloy angle axis birefringent birefringent coating boundary brittle coating brittle-coating calibration cartesian components circuit sensitivity coefficient considered constant cos2 crack pattern curing deformation determined direction displacement Durelli dynamic effect elasticity element employed epoxy equations error Figure fringe order gage current gage length galvanometer given grid hole illustrated in Fig indicated influence isochromatic fringe patterns isoclinic lens light vector linear load measuring method modulus of elasticity normal obtained optical oscillograph output percent photoelastic effect photoelastic materials photoelastic model plane plastic Poisson's ratio polariscope polarizer polymeric potentiometer potentiometer circuit principal strains principal stresses problem Proc produced quarter-wave plate relative resin resistance rosette selected SESA shear stress shown in Fig sin2 slice specimen strain field strain gage strain-gage applications stress components stress distribution stress function Stresscoat Substituting Eqs surface thickness threshold strain time-edge tion two-dimensional voltage wave plate Wheatstone bridge wire zero