Chain Out of Plane Bending (OPB) Fatigue Joint Industry Project (JIP) FEA Results and Multiaxiality Study Results

Rampi, Lucile; Bignonnet, A.; Cunff, Cédric Le; Bourgin, Francois; Vargas, Pedro

doi:10.1115/omae2016-54198

Cited by 9 publications

(17 citation statements)

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“…The Dang Van fatigue criterion was used for deriving the multiaxial safety factor. The main conclusions were published in different papers [15] [18].…”

Section: Dnvgl-os-301mentioning

confidence: 92%

“…consequently, they behave like a bending beam, causing high stresses at certain locations of the chain link. The model used for studying OPB is similar to the model presented by [15], [18]. Three chain links have been represented, one complete and two half links.…”

Section: Out-of-of-plane Bending Modelmentioning

confidence: 99%

“…The Dang Van fatigue criterion has been selected for the fatigue analysis ( one of the conditions for applying it, is that the stabilized cyclic response must be elastic). This criterion has already been used for the fatigue assessment of mooring chains under OPB [15], [18]. A strong point of this criterion compared to others, is its graphical representation, which enables to understand intuitively the role of residual stresses and mean stresses in the fatigue lifetime.…”

Section: Fatigue Analysismentioning

confidence: 99%

“…Some of these factors have already been studied (e.g. Joint Industry Projects on Out-of-Plane Bending [15], [18] and corrosion [143] As already noted in Chapter 2, chains can experience undesirable loading modes, such as OPB.…”

Section: Introductionmentioning

confidence: 99%

“…The latter was responsible for the failure of chain links at the Girassol buoy [14]. This incident launched a JIP (Joint Industry Project) with the objectives of understanding the mechanism of OPB, establishing recommendations for fatigue life design, among others [15] [18]. In this project, only residual stresses generated by proof loading were accounted for.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Multiaxial Fatigue Analysis of Mooring Chain Links Under Tension Loading: Influence of Mean Load and Simplified Assessment

Perez

Bastid

Constantinescu

et al. 2018

Volume 3: Structures, Safety, and Reliability

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Current standards (as an example, DNV-OS-E301[1] and API-RP-2SK[2]) do not account for mean load in the fatigue assessment of mooring chains. Both standards, provide S-N curves derived from experimental work without specifying the mean load for which they have been obtained or proposing a mean load correction function. This paper reports a fatigue analysis study of mooring chains under Tension Loading using a multiaxial fatigue criterion for two different mean loads. Multiaxial fatigue criteria enable to account directly for complex phenomena, such as residual stresses, non-proportionality of the stress tensor, among others. This paper presents an example of the implementation of the Dang Van fatigue criterion for studying the fatigue behavior of mooring chains under tension. It quantifies the effect of the mean load on the fatigue lifetime and the failure location. Furthermore, it also proposes a simplified approach to reduce the complexity and the computational time of the fatigue analysis using Dang Van fatigue criterion. The paper is organized as follows: in the first part an example of the fatigue assessment is reported. Two different loading conditions with the same load amplitude but different mean loads are studied. The assessment method is based on two steps: a mechanical analysis and a fatigue analysis. In the second part, a simplified fatigue assessment method is proposed. As part of this method, a ratio between the fatigue lifetimes of two loading conditions, which have the same load amplitude but different mean load, is formulated. This ratio has been obtained analytically using the geometric representation of the Dang Van fatigue Criterion. Finally, the paper ends with a discussion, based on recent works, regarding the formulation of the locus of the Dang Van criterion and the fatigue properties used for the calibration of this criterion.

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“…The Dang Van fatigue criterion was used for deriving the multiaxial safety factor. The main conclusions were published in different papers [15] [18].…”

Section: Dnvgl-os-301mentioning

confidence: 92%

Section: Out-of-of-plane Bending Modelmentioning

confidence: 99%

Section: Fatigue Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Multiaxial Fatigue Analysis of Mooring Chain Links Under Tension Loading: Influence of Mean Load and Simplified Assessment

Perez

Bastid

Constantinescu

et al. 2018

Volume 3: Structures, Safety, and Reliability

View full text Add to dashboard Cite

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Computational fatigue assessment of mooring chains under tension loading

Perez

Constantinescu

Bastid

et al. 2019

Engineering Failure Analysis

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This paper presents a computational fatigue assessment method of mooring chains under tensile loading, it is composed of a mechanical analysis followed by a fatigue analysis. The mechanical analysis is performed in two steps: residual stress prediction and service loading. From this analysis, the shakedown cycle is extracted at the critical points, ie: the asymptotically stabilized stress-strain cycles. As the mooring chain under service loading is under elastic shakedown, the Dang Van fatigue criterion is applied for the fatigue analysis. The accuracy of the proposed fatigue assessment method is proved by comparing with the experimental results from full-scale fatigue testing of mooring chain in seawater. The numerical results match both the experimental observations with respect to the localization of the damage zone and the lifetime.

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