抄録
Since the past decade, diagnostics evaluation method for the oil tank under ultra low cycle fatigue was continuously discussed at several committees in Japan High Pressure Institute (JHPI). This paper reports the summary of the activity of the committees toward the establishment of the method to estimate crack growth life under repeated large plastic loading. Crack growth behaviors under large cyclic plastic strains were examined experimentally under both axial loadings and bending loadings of a plate with a surface flaw. A series of three-dimensional FEM analyses was also carried out to obtain J-integral value for shell-to-annular joint with various crack sizes.
