Mode I stress intensity factors for semi-elliptical fatigue cracks in curved round bars

Some cyclically loaded components such as mooring chains can develop fatigue cracks in locations where the shape of part is equivalent to that a curved or bent round bar. Here we consider semi-elliptical crack growing from surface This geometry for example represent chain link segment with located at its inner- outer radius. The be either almond shaped, sickle shaped straight-fronted. Stress intensity factors (SIFs) over fronts geometries are present work investigated several elementary mode I stress distributions. Finite element analysis and linear elastic fracture mechanics methods used semi-analytical solutions SIF any point on front. Effects relative bar curvature numerical results demonstrated. Relative otherwise identical straight bars, SIFs bars considered here found differ by up 8%. With an offshore model case example, estimation complex residual field furthermore demonstrated using cubic polynomial approximation.