A fracture mechanics based approach for the analysis of crack growth at weld joints of ship structures

Benqiang Lou, Shengming Zhang, Jimmy Tong, Sai Wong, Fai Cheng, Spyros Hirdaris

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

2 Citations (Scopus)


Existing spectral fatigue analysis techniques used for the assessment of fatigue life of ship structures are based on the S-N curve approach. Such methods do not distinguish between the crack initiation and propagation stages and therefore they do not account for the influence of the size and growth of crack defects on local structural details. The application of fracture mechanics concepts could offer a meaningful alternative as they allow for the estimation of the residual fatigue life once cracks are identified. As a first step toward the pragmatic use of such methods this paper introduces a semi-analytical approach which leads to the derivation of analytical Stress Intensity Factors (SIF) by combining hybrid fracture mechanics theory with FEA. The potential of the method is demonstrated by studying the crack propagation effects on the fatigue life of typical joint idealization.

Original languageEnglish
Title of host publicationAnalysis and Design of Marine Structures - Proceedings of the 5th International Conference on Marine Structures, MARSTRUCT 2015
Number of pages8
ISBN (Electronic)9781138027893
Publication statusPublished - 1 Jan 2015
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Marine Structures - Southampton, United Kingdom
Duration: 25 Mar 201527 Mar 2015
Conference number: 5


ConferenceInternational Conference on Marine Structures
Abbreviated titleMARSTRUCT
CountryUnited Kingdom

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