Today, it is common practice to carry out fatigue assessments of ship structures using direct calculation procedures. A direct calculation analysis of a ship’s fatigue strength involves hydrodynamic analysis, stress response evaluation followed by fatigue damage calculation. Many numerical codes are available for these types of analyses. They could yield different values in a fatigue life prediction because of the different degrees of complexity in the computation of the ship’s response. For example, hydrodynamic loads can be calculated using the strip theory or the panel method. The stress response to these loads can be computed using a beam theory or more advanced analyses, such as global and/or local finite element analyses. In a direct fatigue analysis for ship design, spectral methods have been dominating but there is a growing interest in time-domain fatigue damage calculation procedures. The objective of the current investigation is to compare four commonly used direct calculation methods against measurement data. The comparison is carried out by making a case study on a Panamax container ship on which full-scale measurements have been performed. The computational efforts involved in the application of the current direct calculation methods are compared and their applicability in ship fatigue design is discussed.
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ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
July 1–6, 2012
Rio de Janeiro, Brazil
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4489-2
PROCEEDINGS PAPER
A Comparison of Direct Calculation Approaches Applied on the Fatigue Strength Assessment of a Panamax Container Ship Available to Purchase
Zhiyuan Li,
Zhiyuan Li
Chalmers University of Technology, Gothenburg, Sweden
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Wengang Mao,
Wengang Mao
Chalmers University of Technology, Gothenburg, Sweden
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Jonas W. Ringsberg
Jonas W. Ringsberg
Chalmers University of Technology, Gothenburg, Sweden
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Zhiyuan Li
Chalmers University of Technology, Gothenburg, Sweden
Wengang Mao
Chalmers University of Technology, Gothenburg, Sweden
Jonas W. Ringsberg
Chalmers University of Technology, Gothenburg, Sweden
Paper No:
OMAE2012-83332, pp. 185-192; 8 pages
Published Online:
August 23, 2013
Citation
Li, Z, Mao, W, & Ringsberg, JW. "A Comparison of Direct Calculation Approaches Applied on the Fatigue Strength Assessment of a Panamax Container Ship." Proceedings of the ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. Volume 2: Structures, Safety and Reliability. Rio de Janeiro, Brazil. July 1–6, 2012. pp. 185-192. ASME. https://doi.org/10.1115/OMAE2012-83332
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