☆ 4.7 Article

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

THEORETICAL AND APPLIED FRACTURE MECHANICS (2021)

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

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Summary: This study investigates stress intensity factors for surface cracks with different geometries on curved round bars under various mode I stress distributions. Semi-analytical solutions for SIF at any point on the crack front are developed using finite element analysis and linear elastic fracture mechanics methods. Results demonstrate up to 8% difference in SIF values for cracks in curved bars compared to straight bars, with effects of relative bar curvature on numerical results being shown. The estimation of SIFs for cracks in a complex residual stress field is also demonstrated using a cubic polynomial stress approximation with an offshore mooring chain model as a case study.

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