Prediction of Fracture Failure of Steel Pipes with Sharp Corrosion Pits Using Time-Dependent Reliability Method with Lognormal Process

Published on Jun 1, 2019in Journal of Pressure Vessel Technology-transactions of The Asme1.142
· DOI :10.1115/1.4043010
Guoyang Fu12
Estimated H-index: 12
(Monash University, Clayton campus),
Wei Yang23
Estimated H-index: 23
(VU: Victoria University, Australia)
+ 2 AuthorsSujeeva Setunge26
Estimated H-index: 26
(RMIT: RMIT University)
This paper presents a reliability-based methodology for assessing fracture failures of steel pipes with sharp corrosion pits. Based on newly developed models of elastic fracture toughness, the simple criterion of stress intensity factor (SIF) is used to establish the limit state functions for pipes with sharp corrosion pits in the longitudinal and circumferential directions. A stochastic model of load effect is developed and a time-dependent reliability method based on first passage probability for nonstationary lognormal processes is employed to quantify the probability of failure and predict the remaining service life. After applying the methodology to a case study, sensitivity analysis is carried out to identify the most influential variables on the probability of failure. It is found in the paper that the correlation coefficient has a considerable effect on probability of failure of steel pipes with sharp corrosion pits and that the larger the mode I fracture toughness is, the smaller the probability of pipe failure is.
#1Wei Yang (VU: Victoria University, Australia)H-Index: 23
#2Guoyang Fu (RMIT: RMIT University)H-Index: 12
Last. Chun-Qing Li (RMIT: RMIT University)H-Index: 22
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Linear elastic fracture mechanics has been widely used for fracture analysis of cracked metals. For ductile materials, it is known that the yielding of a crack front results in the easing of stress intensity at the crack front, which ultimately increases the total fracture toughness of the material. Therefore, to use linear elastic fracture mechanics for prediction of the failure of ductile materials requires the extraction of the elastic portion of the fracture toughness. The intention of this ...
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Linear elastic fracture mechanics has been widely employed for fracture analysis of cracked pipes. For ductile metal pipes, the existence of plasticity eases the stress concentration at the crack front, which increases the fracture toughness of the pipe. Therefore, when using linear elastic fracture mechanics to predict the fracture failure of ductile pipes, the plastic portion of the fracture toughness should be excluded. This paper intends to derive an analytical model of elastic fracture toug...
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