抄録
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.
