Numerical Simulation Hot-Spot Stress and Stress Concentration Factor in Simple Tubular Joints T, Y, K, and X
Abstract
In offshore structures installation, tubular joints are commonly used. Tubular joints fabricated with welding processes often cause high hot-spot stress (HSS). High value of HSS and stress concentration factor (SCF) in tubular joints will reduce the service life of offshore structures due to fatigue loads. In this study simple tubular junctions T, Y, K, and X were used to obtain HSS and SCF through FEM simulation. The location of the maximum HSS under axial loading varied around the initial crown, in the In-Plane Bending (IPB) loading located after the second crown, while in the Out-of-Plane Bending (OPB) loading it was around the second saddle. In general, the SCF value in the three loading models from the FEM simulation is lower than SCF formula calculations in the previous study, these results are in line with recent SCF review study.
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References
R. L. Tawekal, Fitriany, and M. T. Tukuboya, “Pengembangan Formula SCF untuk Analisa Kelelahan Joint (Sambungan) T pada Struktur Bangunan Lepas Pantai,” J. Tek. Sipil, vol. 15, no. 1, pp. 33–40, 2006.
A. Naess, Fatigue Handbook Offshore Steel Structure. Tapir, 1985.
Lloyd’s Register, “Stress Concentration Factors for Simple Tubular Joints - Assessment of Existing and Development of New Parametric Formulae,” London, 1997.
D. SinghSaini, D. Karmakar, and S. Ray-Chaudhuri, “A review of stress concentration factors in tubular and non-tubular joints for design of offshore installations,” J. Ocean Eng. Sci., vol. 1, no. 3, pp. 186–202, 2016, doi: https://doi.org/10.1016/j.joes.2016.06.006.
J. G. Kuang, A. B. Potvin, and R. D. Leick, “Stress concentration in tubular joints,” Offshore Technol. Conf., 1975.
P. W. MARSHALL, “A review of stress concentration factors in tubular joints,” Houston, 1978.
A. C. Wordsworth and G. P. Smedley, “Stress concentrations at unstiffened tubular joints,” Eur. Offshore Steels Res. Semin., 1978.
AWS, Structural Welding Code - Steel. 2015.
T. R. Gurney, “Thickness Effect in ‘Relatively Thin’ Welded Joints,” Cambridge, 1995.
N. Pamungkas, “Tugas Kuliah - Analisa Global Sambungan Tubular Bangunan Lepas Pantai tipe Jacket,” Surabaya, 2015.
ANSYS, V11.0 Documentation. Canonsburg, PA: ANSYS Inc.
S. J. Maddox, “Recommended Hot-Spot Stress Design S-N Curves for Fatigue Assessment of FPSOs,” Int. Offshore Polar Eng. Conf., vol. 10, 2001.
