Probabilistic methods for planning of inspection for fatigue cracks in offshore structures
TL;DR: In this article, the authors present guidelines for the use of probabilistic methods for planning in-service inspection for fatigue cracks in offshore structures, based on the work of DNV GL.
About: This article is published in Marine Structures.The article was published on 2016-03-01. It has received 120 citations till now.
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TL;DR: The reliability methods including the first- and second-order reliability methods and the simulation reliability methods are described and the procedure for and application areas of structural reliability analysis of wind turbines are shown.
Abstract: The paper presents a detailed review of the state-of-the-art research activities on structural reliability analysis of wind turbines between the 1990s and 2017. We describe the reliability methods including the first- and second-order reliability methods and the simulation reliability methods and show the procedure for and application areas of structural reliability analysis of wind turbines. Further, we critically review the various structural reliability studies on rotor blades, bottom-fixed support structures, floating systems and mechanical and electrical components. Finally, future applications of structural reliability methods to wind turbine designs are discussed.
77 citations
Cites background from "Probabilistic methods for planning ..."
...A detailed guideline for the use of probabilistic methods for inspection planning of fatigue cracks in jacket structures, semisubmersibles and floating production vessels is recommended in DNV GL RP-C210 [32]....
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..., DNV GL RP-C203 [31] and DNV GL RP-C210 [32]....
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...For manned and unmanned offshore steel jacket structures for oil and gas production, maximum annual probabilities of failure on the order of 10−5 and 10−4 are generally accepted; see, e.g., DNV GL RP-C203 [31] and DNV GL RP-C210 [32]....
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28 Apr 2017
TL;DR: In this paper, a series of static and dynamic characterization tests on the as built catamaran model was conducted to provide a reliable and well identified physical model before the towingtank tests were carried out for giving key insights into the wetdeck load and responses as well as an FSI validation dataset for numerical solvers.
Abstract: The investigation of wetdeck slamming phenomenon is a challenging Fluid-Structure Interaction (FSI) problem for both experimental and numerical analysis, requiring detailed design and structural assessment of the physical model. The focus of this paper is to document the design approach and the testing effort devoted to provide a reliable and well identified physical model before the towingtank tests were carried out for giving key insights into the wetdeck load and responses as well as an FSI validation dataset for numerical solvers. Thus, one of the main objectives is reducing the uncertainty linked to the modeling of the multi-hull structure by performing a series of both static and dynamic characterization tests on the as built catamaran model. The insight gained from this test campaign will be used to update the structural models coupled within the FSI solvers to increase the accuracy of the predicted hydrodynamic loading. Among FSI problems still receiving positive attention in ship and offshore engineering, the accurate prediction of complex loading and responses on multi-hull vessels is particularly demanding, since it involves two-way coupling of the deck structure with the flow impinging on it. Currently, there is a gap in available experimental FSI data related to this problem that can be used for numerical solver validation. Current FSI data sets are severely limited by the uncertainties associated with the experimental setups. Furthermore, though segmented model tests have become more feasible and popular for monohulls, not many experimental campaigns (Hermundstad et al. 1995, Kyyro & Hakala 1997, Cheng, F. 1997) exist for segmented catamarans that provide both global and local loads and hull responses. The only systematic investigation on elastically scaled catamarans was carried out by Lavroff et al. (2007, 2013). Dessi et al. (2016) have already illustrated the preliminary experimental results on an elastically scaled model of a SWATH aimed to accurately depict the wave loading and structural response from seakeeping tests. In the present paper the focus is instead on the structural tests performed for the physical model qualification with an extended account of the dry and wet vibration mode identification of the entire catamaran.
43 citations
TL;DR: In this paper, the authors provide an insight on the different aspects related to this subject, from different types of offshore structures and respective loads to a comprehensive review on damages to steel offshore platforms as well as on the development in available SMR techniques.
43 citations
TL;DR: In this paper, an overview of structural integrity management of offshore structures in the oil and gas energy sector is presented, based on relevant experiences with the hazards, accidents and mine hazards.
Abstract: An overview of structural integrity management of offshore structures in the oil and gas energy sector is presented in this article. Based on relevant experiences with the hazards, accidents and me...
37 citations
Cites background from "Probabilistic methods for planning ..."
...Various sources of POD data are presented by Moan (2005) and in (DNVGL, 2015)....
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...Recently DNVGL (2015) issued a comprehensive guidance for...
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31 citations
References
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5,772 citations
TL;DR: In this article, an empirical stress-intensity factor equation for a surface crack as a function of parametric angle, crack depth, crack length, plate thickness and plate width for tension and bending loads was presented.
1,624 citations
TL;DR: This article surveys the historical development of scientific and engineering knowledge about fatigue of materials and structures in the 20th century, including fatigue as a material phenomenon, prediction models for fatigue properties of structures, and load spectra.
364 citations
01 Aug 1981
TL;DR: In this paper, the stress intensity factors used to develop the equations were obtained from three dimensional finite element analyses of these crack configurations, where the plates were subjected to remote tensile loading.
Abstract: Empirical stress intensity factor equations are presented for embedded elliptical cracks, semi-elliptical surface cracks, quarter-elliptical corner cracks, semi-elliptical surface cracks at a hole, and quarter-elliptical corner cracks at a hole in finite plates. The plates were subjected to remote tensile loading. Equations give stress intensity factors as a function of parametric angle, crack depth, crack length, plate thickness, and where applicable, hole radius. The stress intensity factors used to develop the equations were obtained from three dimensional finite element analyses of these crack configurations.
298 citations