Abstract
In order to prevent failure accidents, it is important to detect cracks in advance. However in the pressure vessel piping at the nuclear power plant, the crack detection is difficult since a crack develops from an inside, surface temperature of piping is high, and radioactivity is contained in the water which passes along a pipe. There is no effective evaluation method that can be applied for such an environment. Digital image correlation method can be applied to detect a crack in used in such an environment. In this study, we evaluated the fracture mechanics parameter from the back surface using a new digital image correlation method.
