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The Effect of Fatigue Loading Spectrum on Crack Propagation in a Ship Detail

[+] Author Affiliations
Xiaoping Huang, Xiaoshun Yan

Shanghai Jiao Tong University, Shanghai, China

Muk Chen Ong

University of Stavanger, Stavanger, Norway

Yingcai Huang

Universidade de Lisboa, Lisbon, Portugal

Paper No. OMAE2018-77152, pp. V11BT12A032; 8 pages
doi:10.1115/OMAE2018-77152
From:
  • ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 11B: Honoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering
  • Madrid, Spain, June 17–22, 2018
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5133-3
  • Copyright © 2018 by ASME

abstract

The assessment of the loading sequence on fatigue crack growth of cracked details is essential when the ship hull is subjected to random wave-induced loading during the service time. In this paper, the effect of loading sequence on the crack growth life is investigated in order to find a physical engineering method to generate fatigue loading spectrum for ship fatigue assessment. The long term distribution of fatigue loading and the unique crack growth rate curve model have been employed in the analysis. The results show that the shape parameter affects the fatigue life significantly if the long-term distribution of wave-induced stress range is modeled by two-parameter Weibull distribution. Moreover, the spectral-based method provides a reasonable fatigue loading spectrum and avoid the confusion in determining the shape parameter for different empirical formulas, which are recommended by several main ship classification societies. An example of fatigue assessment for a cracked detail in a container ship is demonstrated as a reference for fatigue assessment of a ship hull based on crack growth.

Copyright © 2018 by ASME

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