Parametric study of geometrical effects on the degree of bending (DoB) in offshore tubular K-joints under out-of-plane bending loads |
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| Institution: | 1. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, China;2. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian, China;1. School of Civil Engineering and Architecture, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China;2. Department of Construction and Building Engineering, Egyptian Chinese University, Cairo, Egypt;3. Department of Structural Engineering, Tanta University, Tanta, Egypt |
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| Abstract: | In this paper, results of comprehensive finite element (FE) analyses carried out on 81 generated models of tubular K-joints are presented. Results of FE models were verified against experimental data and parametric equations. The fatigue life of a tubular joint, which is commonly found in offshore industry, is not only dependent on the value of hot-spot stress (HSS), but is also significantly influenced by the through-the-thickness stress distribution characterized by the degree of bending (DoB). Data extracted from FE analyses was used to study the effects of geometrical parameters on the DoB values in tubular K-joints subjected to two types of out-of-plane bending (OPB) moment loads. The determination of DoB values in a tubular joint is essential for improving the accuracy of fatigue life estimation using the stress-life (S–N) method and particularly for predicting the fatigue crack growth based on the fracture mechanics (FM) approach. Geometrically parametric investigation was followed by a set of nonlinear regression analyses to develop DoB parametric formulas for the fatigue analysis of K-joints under OPB loadings. |
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| Keywords: | Tubular K-joint Fatigue Degree of bending (DoB) Out-of-plane bending (OPB) Parametric equation |
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