Three-dimensional photoelasticity by the stress-freezing method has been considered to be one of the most powerful methods of experimental stress analysis. The main part of this study obtains stress intensity factor for through-thickness crack, corner crack, surface crack and through-thickness crack emanating from a hole by stress-freezing photoelasticity. Fringe multiplication technique is used for data analysis. The transverse variation of stress intensity factors for through-thickness crack is in agreement with that postulated by the theory. Also, it is shown that stress intensity factors distribution along crack front for surface crack linearly decrease with the increase of angle from crack root.
