Investigation on fatigue damage calibration factors in offshore structures

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Shabakhty, N (Author) Other; Haselibozchaloee, D (Author) Other; Correia, JAFO (Author) FEUP

Journal

Title: Proceedings of the Institution of Civil Engineers: Maritime Engineering

Vol. 174 No. 1

Pages: 65-80

ISSN: 1741-7597

Publisher: Thomas Telford Services Ltd.

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 4 Citations

Other information

Authenticus ID: P-00V-FG9

DOI: 10.1680/jmaen.2020.17

Abstract (EN): Fatigue damage in marine structures is generally assessed by means of stress-number of cycles (S-N) curves. These curves are obtained from many experimental tests on structural components. Fracture mechanics (FM), using the crack propagation method is also a practical technique. In this approach, fatigue damage is estimated based on crack propagation from an initial crack size through the surface and depth of structural members. In this paper, S-N curves based on FM were compared with S-N curves obtained following two standards: DNVGL-RP-C203 and API-RP2A-WSD. The results showed that the curves did not agree well. Therefore, to obtain better fitting, calibration factors are needed. From S-N curves established for two stages, two calibration factors - alpha(1) ( for the first stage) and alpha(2) (for the second stage) - are proposed for fitting S-N curves based on the FM approach with the DNV GL and the API S-N curves. The wall thickness, the initial crack depth and the critical crack depth were found to have a significant effect on determination of the calibration factors.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16