抄録
This paper proposes a single-specimen technique for determining the J-R curve of metallic materials. The stable crack extension is evaluated by two methods, such as Electric Potential Difference Method and Finite Element Method, which are applied for determining the K_<IH> (the threshold value for the onset of hydrogen enhanced crack growth for 21/4Cr-Mo steel). There is in close agreement between them in determining the K_<IH>.
