Initial Crack Depth and POD Values Inferred From In-Service Observations of Cracks in North Sea Jackets

Torgeir Moan; Ole T. Vårdal; Nils-C. Hellevig; Knut Skjoldli

doi:10.1115/1.1286676

Journal of Offshore Mechanics and Arctic Engineering | Volume 122 | Issue 3 | TECHNICAL PAPERS

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TECHNICAL PAPERS

Initial Crack Depth and POD Values Inferred From In-Service Observations of Cracks in North Sea Jackets

Torgeir Moan, Ole T. Vårdal, Nils-C. Hellevig and Knut Skjoldli

[+] Author and Article Information

Torgeir Moan

Department of Marine Structures, Norwegian University of Science and Technology, 7034 Trondheim, Norway

Ole T. Vårdal, Nils-C. Hellevig, Knut Skjoldli

Aker Offshore Partner, Bergen, Norway

J. Offshore Mech. Arct. Eng 122(3), 157-162 (Apr 14, 2000) (6 pages) doi:10.1115/1.1286676 History: Received March 02, 2000; Revised April 14, 2000

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Total number of 690 fabrication and fatigue cracks, as arranged by crack depth

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Crack depth measures

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Probability density function f_A(a), probability of crack detection function P_D(a) and distribution of detected cracks f_A,D1(a) plotted in the same figure. λ=1.95 mm (POD) and λ₀=0.94 mm (mean initial crack size). The bars plotted represent the observed frequency of fabrication cracks. The bars to be compared with the distribution of detected cracks f_A,D1(a).

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Back calculated initial crack size based on 144 cracks judged as fatigue crack. Method 1 presented in Section 3.2 is applied. The prior distribution of initial crack depth is assumed to be uniform over the interval 0–3 mm and the posterior distribution is fitted to an exponential distribution with parameter λ₀=1.0 mm.

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Moan T, Vårdal OT, Hellevig NC, Skjoldli K. Initial Crack Depth and POD Values Inferred From In-Service Observations of Cracks in North Sea Jackets. ASME. J. Offshore Mech. Arct. Eng. 2000;122(3):157-162. doi:10.1115/1.1286676.

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Initial Crack Depth and POD Values Inferred From In-Service Observations of Cracks in North Sea Jackets

References

Figures

Total number of 690 fabrication and fatigue cracks, as arranged by crack depth

Crack depth measures

Tables

Errata

Discussions

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