Journal ArticleDOI
Applications of Probabilistic Fracture Mechanics to Offshore Structures
TLDR
In this article, a review of uncertainties involved in fatigue life predictions by fracture mechanics is presented with particular reference to steel structures, including uncertainties in loading, initial and critical defect sizes, material parameters, and in the uncertainty related to computation of the stress intensity factor.Abstract:
For offshore structures the fatigue limit state is governing the structural dimensions of several members and joint connections. Safety against fatigue failure is achieved through a combination of design requirements and performance of in-service inspections with repair of detected fatigue cracks. A review of uncertainties involved in fatigue life predictions by fracture mechanics is presented with particular reference to steel structures. Sources of uncertainties considered are: environmental conditions, hydrodynamic loading, global structural analysis, local stress calculation at fatigue sensitive points, and fatigue crack growth modeling by fracture mechanics. A probabilistic model using the fracture mechanics in probabilistic form is presented. This model accounts for uncertainties in loading, initial and critical defect sizes, material parameters, and in the uncertainty related to computation of the stress intensity factor. Failure probabilities are computed by first-order reliability methods and sensitivity factors are determined. Model updating based on in-service inspection results is formulated. Uncertainties with respect to detecting a crack and to correctly sizing a crack are included. Experience on application of the analysis method is presented.read more
Citations
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Journal ArticleDOI
Fatigue reliability of welded steel structures
TL;DR: In this article, two different approaches to the formulation of the fatigue limit state are considered, the first based on S-N lines in combination with Miner's damage accumulation rule, and the second based on fracture mechanics crack growth models and failure criteria.
Journal ArticleDOI
Fatigue reliability reassessment applications: state-of-the-art paper
TL;DR: In this article, the problem of assessing the damage to and remaining life of structures subjected to fatigue is explored, with particular emphasis on railroad bridges, highway bridges, and offshore structures.
Journal ArticleDOI
Probabilistic fatigue analysis under constant amplitude loading
TL;DR: In this article, fracture mechanics-based fatigue analysis for bridge details are examined under constant amplitude loading and the 50 and 97.7% probability of survival lines are obtained using appropriately selected stress intensity factors, a bi-linear crack growth model and a failure assessment diagram.
Journal ArticleDOI
Risk Analysis of Fatigue-Induced Sequential Failures by Branch-and-Bound Method Employing System Reliability Bounds
Young-Joo Lee,Junho Song +1 more
TL;DR: In this paper, the authors proposed a method to quantify the overall risk of fatigue-induced sequential failure by system reliability analysis based on the identified failure sequences, which is computationally intractable.
Journal ArticleDOI
Fatigue and fracture simulation of welded bridge details through a bi-linear crack growth law
TL;DR: In this article, a probabilistic fracture mechanics approach was used to predict the fatigue life of welded steel details in the presence of cracks under bridge spectrum loading, which is based on a recently proposed bi-linear relationship to model fatigue crack growth and incorporates a failure criterion to describe the interaction between fracture and plastic collapse.
References
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Book ChapterDOI
The Significance of Fatigue Crack Closure
TL;DR: Al alloy sheet fatigue crack closure under cyclic tensile loading, deriving expression for crack propagation rate in terms of effective stress amplitude as discussed by the authors, was derived for the first time in the literature.
Journal ArticleDOI
Fatigue under Wide Band Random Stresses
Paul H. Wirsching,Mark C. Light +1 more
TL;DR: In this paper, a method for predicting high cycle fatigue under stationary gaussian wide band stress processes is developed, where the rainflow cycle counting method is used as the basis for predicting fatigue damage.