Local strain estimation method for low- and high-cycle fatigue strength evaluation

The authors previously proposed a fatigue strength evaluation method based on the effective notch strain concept and reported that the fatigue strength of load-carrying cruciform joints can be assessed by the effective notch strain regardless of the mismatching and the incomplete penetration ratio from the low- to the high-cycle fatigue region. However, in applications to actual structures, this method has difficulty in modeling and analysis because it requires extremely fine meshing around the welds. Therefore, in this paper, an estimation method of the effective notch strain from nominal strain is proposed.

► Effective notch strain concept can assess low and high cycle fatigue strength.
► Effective notch strain concept is difficult to apply into actual structures.
► Simply estimation method of effective notch strain from nominal strain is proposed.