Abstract
High-temperature plants, such as nuclear and thermal power plants are used under severe conditions. High temperature plants are susceptible to micro-cracks in its structure. This is because there is the effect of cyclic fatigue and creep fatigue. To prevent serious accidents, including small defects in the structure, we predicted the destruction, we must use safely. In particular, the evaluation of fatigue crack is important. In this study, we analyzed the J-integral using the virtual crack extension method and finite element method. Analysis model is a two-dimensional flat plate with a crack in the center, it is assumed that the load on fatigue. Moreover, we examine the effect of the amount of virtual crack extension used in the analysis.
