抄録
Hydrogen embrittlement of steel was caused due to hydrogen in the material. Fracture surface due to hydrogen embrittlement is expected to concern with the local hydrogen distribution around a crack tip, and this distribution depends on the material property and loading condition. On the other hand, slow stress rate test and fatigue test have been conducted for hydrogen embrittlement test using C(T) or smooth tensile specimen. However, concerning stress induced hydrogen diffusion under local stress field, the hydrogen distribution is different depending on the test method and specimen. In this study, hydrogen distributions around a notch tip under fatigue condition were obtained by numerical analysis for uniaxial tensile test and three point bending test. The effect of test method for hydrogen embrittlement was considered.
