The fatigue design of forged steel connectors in steel catenary risers (SCRs) is commonly based on the BS 7608 Class B S-N curve, which was derived from longitudinal butt weld data. However, there is very little direct support for this. Therefore, its validity was checked by performing a fatigue test programme involving strip specimens extracted from actual forged J-lay connectors. The effects of stress ratio and surface roughness on fatigue strength were investigated. On the basis of these test results, together with available published data obtained from specimens or structural components that failed in plain steel, the Class B S-N curve was verified. The method was particularly conservative for low stress ratios in the high-cycle regime and a procedure based on the use of the Goodman diagram was devised for correcting the Class B curve for mean stress. Surface roughness in the range investigated, between 3.2 and 8.1μm in Ra, had little effect on the fatigue performance of the forged steel.
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ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2016
Busan, South Korea
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4995-8
PROCEEDINGS PAPER
Verification of Class B S-N Curve for Fatigue Design of Forged Steel Connectors
S. Manteghi
S. Manteghi
BP, Sunbury, UK
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Y.-H. Zhang
TWI Ltd, Cambridge, UK
S. J. Maddox
TWI Ltd, Cambridge, UK
S. Manteghi
BP, Sunbury, UK
Paper No:
OMAE2016-54193, V004T03A013; 10 pages
Published Online:
October 18, 2016
Citation
Zhang, Y, Maddox, SJ, & Manteghi, S. "Verification of Class B S-N Curve for Fatigue Design of Forged Steel Connectors." Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. Volume 4: Materials Technology. Busan, South Korea. June 19–24, 2016. V004T03A013. ASME. https://doi.org/10.1115/OMAE2016-54193
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