A relative crack opening time correlation for corrosion fatigue crack growth in offshore structures

O. Adedipe, F. Brennan, A. Kolios

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A considerable amount of research has been carried out on the prediction of mean stress effects on fatigue crack growth in structures. Newer types of structure are now being developed for use in highly dynamic, harsh marine environments, particularly for renewable energy applications. Therefore, the extent to which mean stresses can enhance corrosion-assisted fatigue damage in these structures needs to be better understood. A new theoretical model that accounts for mean stress effects on corrosion fatigue crack growth is proposed. The model is developed based on the relative crack opening period per fatigue cycle and by considering only the damaging portion of the stress cycle. The baseline data for the modelling exercise are the data obtained at a stress ratio of 0.1 in air and seawater tests conducted on compact tension specimens. The model is validated by comparison with experimental data and with other fatigue crack propagation models. The proposed model correlates fairly well with experimental data and the other models examined.

Original languageEnglish
Pages (from-to)395-411
Number of pages17
JournalFatigue and Fracture of Engineering Materials and Structures
Volume39
Issue number4
Early online date21 Oct 2015
DOIs
Publication statusPublished - 1 Apr 2016

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Keywords

  • corrosion fatigue
  • crack growth rate
  • crack opening
  • mean stress
  • stress intensity factor

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