Comparison of experimental, numerical and analytical risk assessment of oil drilling rig welded pipe based on fracture mechanics parameters. (August 2020)

• Record Type: Journal Article
• Authors: Kirin, Snežana; Sedmak, Aleksandar; Zaidi, Radzeya; Grbović, Aleksandar; Šarkočević, Živče
• Is Part Of: Engineering failure analysis. Volume 114(2020)
• Publication Date: 2020-08
• Subjects: Risk assessment -- Structural integrity -- Fracture mechanics parameters -- Oil drilling rig pipe; System failures (Engineering) -- Periodicals; Fracture mechanics -- Periodicals; Reliability (Engineering) -- Periodicals; Pannes -- Périodiques; Rupture, Mécanique de la -- Périodiques; Fiabilité -- Périodiques; Fracture mechanics; Reliability (Engineering); System failures (Engineering); Periodicals; Electronic journals; 620.112
• DOI: 10.1016/j.engfailanal.2020.104600
• Languages: English
• ISSNs: 1350-6307

Abstract

Highlights: Simple engineering analysis is presented, based on calculation of fracture mechanics parameters. Numerical and experimental approach is needed for complex geometries and material behaviour. Risk based analysis is useful method to provide gap between engineers and managers. The best approach would be to adopt two-phase decision making process. Abstract: Fracture mechanics parameters are used for experimental, numerical and analytical risk assessment of structural integrity and life of oil drilling rig welded pipe with a crack. As a simple analytical tool, the Failure Assessment Diagramme (FAD) has been applied to assess probability of pipe failure, using the ratio of linear elastic fracture mechanics parameter, KI, and its critical value, KIc, in relation to the ratio of applied stress and its critical value. Alternatively, the ratio of J integral, evaluated experimentally and numerically, and its critical value, JIc, has been used to estimate probability of failure. Risk was then assessed for all three approaches, in combination with the estimated consequence. Results are given in the form of risk matrix, indicating the effects of the most (analytical) and the least (experimental) conservative estimates. In the case of risk based structural life assessment, number of cycles, obtained analytically and numerically, are related to the number of cycles to the critical crack length, to assess risk due to fatigue.