Fatigue is one of the main concerns of the offshore industry nowadays, since the failure of equipments could put not only the environment but also some people’s lives in danger. As described in DNV-RP-C203 and in DNV-RP-F204, the aim of fatigue analysis is to verify if a certain structure — in this case, a riser — will be able to operate adequately during a desired period of time, as well as to obtain information to program inspections. In a riser, the efforts vary along its length and also around its circumference. If one considers the stress around the circumference, the maximum stress point may change. To be realistic, one approach is to calculate the stress and fatigue life around the circumference. To be more conservative and also simplify the calculation, one could consider that the maximum stress always occurs at the same point. The purpose of this paper is to compare the fatigue life obtained with both approaches in order to verify the differences between them and verify how conservative that simplification can be. To perform the task, a steel riser is considered and the dynamic analysis is executed in time domain using Orcaflex 9.4. The fatigue is analyzed through the S-N Curve approach and the Miner’s rule is used to accumulate the damage.
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ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2011
Rotterdam, The Netherlands
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4436-6
PROCEEDINGS PAPER
Comparison of Different Approaches for Fatigue Damage Accumulation in Steel Risers
Fernanda C. M. Takafuji,
Fernanda C. M. Takafuji
University of Sa˜o Paulo, Sa˜o Paulo, Brazil
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Clo´vis A. Martins
Clo´vis A. Martins
University of Sa˜o Paulo, Sa˜o Paulo, Brazil
Search for other works by this author on:
Fernanda C. M. Takafuji
University of Sa˜o Paulo, Sa˜o Paulo, Brazil
Clo´vis A. Martins
University of Sa˜o Paulo, Sa˜o Paulo, Brazil
Paper No:
OMAE2011-49888, pp. 727-735; 9 pages
Published Online:
October 31, 2011
Citation
Takafuji, FCM, & Martins, CA. "Comparison of Different Approaches for Fatigue Damage Accumulation in Steel Risers." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 4: Pipeline and Riser Technology. Rotterdam, The Netherlands. June 19–24, 2011. pp. 727-735. ASME. https://doi.org/10.1115/OMAE2011-49888
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