Abstract
Shearography provides whole-field derivatives of displacement. In many plate-bending problems, stresses are proportional to curvatures. A novel digital scheme is proposed to digitally shear the shearographic fringes to obtain second derivatives or curvature contours over the whole field. Since differentiation is noise-prone, a novel filtering approach is proposed to obtain good results. Examples of the method for different shear amounts are shown to reveal the advantages and capabilities of this approach.
