Probabilistic flaw assessment of a surface crack in a mooring chain using the first- and second-order reliability method. (January 2019)

• Record Type: Journal Article
• Authors: Lee, Choong-Hyun; Kim, Yooil
• Is Part Of: Marine structures. Volume 63(2018)
• Page Start: 1
• Page End: 15
• Publication Date: 2019-01
• Subjects: Engineering criticality analysis -- BS7910 -- Fracture mechanics -- Crack propagation -- Limit state function -- FORM -- SORM; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2018.09.003
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: This study reports the results of a reliability-based flaw assessment for cracks in the mooring chain of a floating type offshore structure. The flaw assessment procedure of BS7910 was combined with the first- and second-order reliability method (FORM, SORM) so that the acceptance of a given flaw can be assessed considering the uncertainties of the parameters that play an important role in the flaw assessment. The failure probability was calculated using FORM and SORM considering the probabilistic nature of the crack size and the long-term distribution of stresses acting on the crack in the mooring chain. To check the validity of FORM and SORM, a Monte Carlo simulation was also carried out to derive the true limit state function and compared with the results of FORM and SORM. Highlights: The first- and second-order reliability method was combined with the flaw assessment procedure of BS7910. Methodology was applied to an artificial crack in a mooring chain. Accuracy and efficiency was good when compared with Monte Carlo simulation results.