Validation of the corrected Dang Van multiaxial fatigue criterion applied to turret bearings of FPSO offloading buoys

Lieshout, P.S. van; Besten, J.H. den; Kaminski, M.L.

doi:10.1080/17445302.2016.1182461

Cited by 16 publications

(14 citation statements)

References 13 publications

(16 reference statements)

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“…(1). A similar analysis carried out by the staircase method gave typically 5% higher mean fatigue limits, [2]. The large scatter for series 2 is peculiar.…”

Section: Test Results and Discussionmentioning

confidence: 67%

“…The acting stress can be found by empirical equations or by advanced Finite Element Models for the contact between wheel and rail. We will not pursue this procedure in the present article; the reader is referenced to [1,2].…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…This is verified by full scale fatigue testing. The practical design based on the obtained model is verified by full scale testing and the reader is referred to [2] on this subject.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue methodology for life predictions for the wheel-rail contact area in large offshore turret bearings

Lassen

Mikulski

2016

Frattura Ed Integrità Strutturale

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The present report presents a fatigue life prediction method for large roller bearings applied in the turret turn table for large loading buoy units. The contact points between wheel and rail in these bearings are subjected to a multi-axial fluctuating stress situation and both surface wear and fatigue cracking may occur. A methodology based on the Dang Van fatigue criterion is adopted. The criterion is based on an equivalent stress defined as a combination of the fluctuation of the shear stress from its mean value at a critical plane and the associated hydrostatic stress at the given time. The present work is supporting the theoretical model by extensive laboratory testing. Both full scale testing of wheel on rail and small scale testing for characterizing the steel material are carried out. An experimental program was carried out with the high strength stainless steel S165M. The Dang Van stress concept is applied in combination with the Random Fatigue Limit Method (RFLM) for life data analyses. This approach gives the opportunity to include both finite lives and the run-outs in a rational manner without any presumption of the existence of a fatigue limit in advance of the data. This gives a non-linear S-N curve for a log-log scale in the very high cycle regime close to the fatigue limit. It is demonstrated how the scatter in fatigue limit decreases when the Dang Van stress concept is applied and that the fatigue limit is occurring beyond 10 7 cycles.

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“…(1). A similar analysis carried out by the staircase method gave typically 5% higher mean fatigue limits, [2]. The large scatter for series 2 is peculiar.…”

Section: Test Results and Discussionmentioning

confidence: 67%

Section: Test Results and Discussionmentioning

confidence: 99%

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Fatigue methodology for life predictions for the wheel-rail contact area in large offshore turret bearings

Lassen

Mikulski

2016

Frattura Ed Integrità Strutturale

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“…However, in all these scatter diagrams joint information between wind waves and swells is lost. This may result in non-conservative fatigue lifetime estimations, especially when associated stress components are multiaxial and non-proportional (van Lieshout et al 2016). This problem can be avoided by using the sea-state time series.…”

Section: Wave Data Formatsmentioning

confidence: 99%

Applicability of WaveWatch-III wave model to fatigue assessment of offshore floating structures

Zou

Kaminski

2016

Ocean Dynamics

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In design and operation of floating offshore structures, one has to avoid fatigue failures caused by action of ocean waves. The aim of this paper is to investigate the applicability of WaveWatch-III wave model to fatigue assessment of offshore floating structures. The applicability was investigated for Bluewaters' FPSO (Floating Production, Storage and Offloading) which had been turret moored at Sable field for half a decade. The waves were predicted as sea-state time series consisting of one wind sea and one swell. The predicted waves were compared with wave data obtained from ERAinterim and buoy measurements. Furthermore, the fatigue calculations were also carried out for main deck and side shell locations. It has been concluded that predicted fatigue damages of main deck using WaveWatch-III are in a very good agreement regardless of differences in predicted wind waves and swells caused by differences in wave system partitioning. When compared to buoy measurements, the model underestimates fatigue damages of side shell by approximately 30 %. The reason for that has been found in wider directional spreading of actual waves. The WaveWatch-III wave model has been found suitable for the fatigue assessment. However, more attention should be paid on relative wave directionality, wave system partitioning and uncertainty analysis in further development.

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“…This 'safe region' is then identified by a fatigue boundary definition. An example of such a definition is the Dang Van criterion [16][17][18][19]. However, to obtain a fatigue lifetime estimate four steps have to be undertaken.…”

Section: Fatigue Analysis;mentioning

confidence: 99%

Comparative study of multiaxial fatigue methods applied to welded joints in marine structures

Lieshout¹,

Besten²,

Kaminski³

2016

Frattura Ed Integrità Strutturale

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ABSTRACT. Marine structures are particularly prone to action of waves, winds and currents with stochastically varying composition, intensities and directions. Therefore, resultant stresses may cause multiaxial fatigue in specific welded structural details. For the assessment of multiaxial fatigue in welded joints, a wide variety of methods have been suggested. However, there is still no consensus on a method which can correctly account for non-proportional and variable amplitude loading. This paper beholds a comparative study of multiaxial fatigue methods applicable for design of marine structures. For the purpose of comparison several load cases were defined including non-proportional and variable amplitude loadings with different normal and shear stress amplitude ratios. Three types of methods are compared: those described by three different codes (i.e. Eurocode 3, IIW and DNV-GL), those described by three different multiaxial fatigue approaches from literature (i.e. Modified Carpinteri-Spagnoli Criterion, Modified Wohler Curve Method and Effective Equivalent Stress Hypothesis) and an approach based on Path-Dependent-Maximum-Range multiaxial cycle counting. From this study it has been concluded that non-proportional variable amplitude loading has a significant negative impact on the fatigue lifetime estimates, and that further research and experimental testing are essential to come to a consensus.

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Validation of the corrected Dang Van multiaxial fatigue criterion applied to turret bearings of FPSO offloading buoys

Cited by 16 publications

References 13 publications

Fatigue methodology for life predictions for the wheel-rail contact area in large offshore turret bearings

Fatigue methodology for life predictions for the wheel-rail contact area in large offshore turret bearings

Applicability of WaveWatch-III wave model to fatigue assessment of offshore floating structures

Comparative study of multiaxial fatigue methods applied to welded joints in marine structures

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