Towards a Unified Fatigue Life Prediction Method for Marine Structures

Cui, Weicheng; Huang, Xiaoping; Wang, Fang

doi:10.1007/978-3-642-41831-0

Cited by 14 publications

(15 citation statements)

References 94 publications

(146 reference statements)

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“…where Φ is the modified factor of the crack opening level and its expression varies with the different loading modes. More information on the above crack growth rate model can be obtained from the respective references [8][9][10]. Fig.…”

Section: Application Of Slhs In the Unified Fatigue Life Prediction Mmentioning

confidence: 99%

“…Methods based on FCP theory have the potential to meet precision requirements and to explain most of phenomena observed so far. In the last decade, the authors' group has spent great efforts to develop a unified fatigue life prediction (UFLP) method for marine structures [3][4][5][6][7][8][9][10]. There are two critical issues that need to be solved for this development.…”

Section: Introductionmentioning

confidence: 99%

“…In the last decade, the authors’ group has spent great efforts to develop a unified fatigue life prediction (UFLP) method for marine structures. 4–11 There are two critical issues that need to be solved for this development. One is to establish an accurate fatigue crack growth rate model that can at least explain all the fatigue phenomena observed in laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

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An improved procedure for generating standardised load-time histories for marine structures

Cui

Paik

2015

Proceedings of the Institution of Mechanical Engineers, Part M:

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The load sequence effect has been proved from laboratory tests to be an influencing factor that cannot be neglected in the fatigue analysis of marine structures. To take account of this significant factor, fatigue life prediction should be based on fatigue crack propagation theory rather than the currently used cumulative fatigue damage theory. Accordingly, fatigue loading needs to be provided as the load-time history in the time domain rather than the load spectrum in the frequency domain. A general procedure for generating the standardised load-time history (SLH) for marine structures based on a short-term load measurement has been proposed by the authors. This paper seeks to further improve on this procedure and explain how to apply the determined SLH in the fatigue life prediction method based on the fatigue crack propagation theory. Finally, generation and application of a SLH is given for a tubular T-joint of an offshore platform, which demonstrates the practical and effective use of the proposed approach.

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Section: Application Of Slhs In the Unified Fatigue Life Prediction Mmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An improved procedure for generating standardised load-time histories for marine structures

Cui

Paik

2015

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…ΔK f = ΔK f,e and ΔK th = ΔK th,e , has been introduced to deal with crack growth anomalies as well (McEvily and Minakawa 1984). In order to develop a unified crack growth relation (Cui et al 2011(Cui et al , 2014Huang et al 2009), McEvily's model has been generalised by incorporating unstable growth in region-iii up to fracture (Figure 7) and slope values different from m = 2 because of material dependency.…”

Section: Crack Tip Stress Intensity Criterionmentioning

confidence: 99%

Fatigue damage criteria classification, modelling developments and trends for welded joints in marine structures

Besten

2018

Ships and Offshore Structures

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Fatigue is typically a governing limit state for marine structures. Welded joints are the weakest links in that respect. Physics involve several resistance dimensions, a range of scales and distinct contributions in different stages of the accumulative damage process. Fatigue damage criteria developed over time have been classified with respect to type of information, geometry, parameter and process zone including plane and life region annotations. The criteria are evaluated regarding model (in)capabilities, showing up to what extent (governing) physics are taken into account. Modelling developments and trends towards complete strength, multi-scale and total life criteria have been identified. Incorporating all four (interacting) fatigue resistance dimensions: material, geometry, loading & response and environment translates into a complete strength fatigue damage criterion. Considering macro-, meso-and micro-scale information provides a multi-scale fatigue damage criterion. Correlation of crack initiation and growth requires matching intact and cracked geometry parameters, revealing a total life fatigue damage criterion. HIGHLIGHTS• Classification of fatigue damage criteria with respect to type of information, geometry, parameter and process zone including plane and life region annotations.• Identification of modelling developments and trends towards complete strength, multi-scale and total life fatigue damage criteria for welded joints in marine structures. NomenclatureA notch strain energy density process zone area C crack growth or fatigue resistance curve intercept (endurance coefficient) D fatigue damage E normal strain at macro-scale E Young's modulus J crack tip energy density J 1 hydrostatic stress or strain component J 2 deviatoric stress or strain component K σ crack tip stress intensity factor K ɛ crack tip strain intensity factor K' work hardening coefficient K N notch stress intensity factor K N I mode-I notch stress intensity factor K N III mode-III notch stress intensity factor K I mode-I stress intensity factor K I T total mode-I stress intensity factor K I r residual mode-I stress intensity factor K III mode-III stress intensity factor K * FE dimensionless FE based notch stress intensity factor N (total) number of cycles until failure N i number of cycles corresponding to initiation N g number of cycles corresponding to growth R notch strain energy density process zone radius S stress based fatigue damage criterion S B Battelle structural normal stress range S e effective notch stress range S eq (equivalent) Von Mises stress range S n nominal stress range S s hot spot structural stress range S T total stress range T temperature T B Battelle structural shear stress range T σS strength scatter band index W energy based fatigue damage criterion W N notch strain energy W N A notch strain energy density Y n notch factor Y f far field factor a crack size (i.e. length) a 0 critical defect size a d long-term corrosion pit size (i.e. depth) a i (real) defect or initial crack size a n (root) not...

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“…Different from the CFD method, the FCP approach is based on fracture mechanics and can take into account load sequence effects. There have been studies adopting the FCP approach for fatigue life assessment (Cui, 2002;Miller, 1999;Newman Jr, 1998).…”

Section: Non-linear Bending Analysismentioning

confidence: 99%

Mechanical characterization of yachts and pleasure crafts fillers

Nebbia¹,

Rizzo²,

Caleo³

2015

Analysis and Design of Marine Structures V

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There is accelerating interest in composite risers for deepwater applications. Composite risers offer much higher strength to weight ratios over metallic risers but there is less experience of their behavior in deepwater environments. A general review on current developments specific to composite risers highlighting the remaining challenges and the applications, design evolution, state-of-the-art modeling and experimental techniques is lacking. This paper provides such a review on fiber-reinforced polymer composite risers. The major issues for composite risers are addressed including the complicated combination of loads under harsh deep sea environment, the lack of long-term material degradation database for assessing the reliability of these riser systems and the need of effective numerical models to fully account for complex realistic loading configurations. The paper also highlights current gaps for design and application of composite risers in offshore technology and promising future research areas to help expand their utilization in deeper water.

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Towards a Unified Fatigue Life Prediction Method for Marine Structures

Cited by 14 publications

References 94 publications

An improved procedure for generating standardised load-time histories for marine structures

An improved procedure for generating standardised load-time histories for marine structures

Fatigue damage criteria classification, modelling developments and trends for welded joints in marine structures

Mechanical characterization of yachts and pleasure crafts fillers

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