Abstract
Cracks frequently occur around welded part in degradation problem of steel structure. The inspection of crack damage is carried out by visual inspection and magnetic particle examination as needed. However, it has disadvantages that depend on inspector's skill in visual inspection and is impossible to detect because of accuracy of detection and deal with internal cracks and defects in non-destructive inspection. Therefore, I investigated method of-confirming the presence or absence of cracks as a way that inspector with little experience and skill check cracks certainly by calculating rate of X-axis and Y-axis stress around cracks. In this paper, I carried out vibration fatigue test using actual size specimen, based on the result, I investigated by analysis models made with 3D FEM general-purpose analysis software.
