抄録
Hydrogen embrittlement of steel was caused due to hydrogen accumulation in the material. And the hydrogen distribution in material depends on the distribution of hydrostatic stress. Furthermore, since actual structures have the three dimensional shapes, each component will be under the local multiaxial. Therefore, concerning stress induced hydrogen diffusion under local stress field, the hydrogen distribution depends on the multiaxial stress. In this study, hydrogen distributions around a notch tip under fatigue condition were obtained by numerical analysis for a two dimensional plane stress model and a three dimensional axial symmetric model. Concerning hydrogen diffusion analysis in structural component, FEM (finite element method) - FDM (finite difference method) coupled method was applied for this numerical analysis. And the effect of multiaxial stress on hydrogen diffusion behavior was investigated. Hydrogen concentration behaviors were found to be dominated by local multi-axial stress in structure.
