The effect of mean stress and stress biaxiality in high‐cycle fatigue

Koutiri, Imade; Bellett, Daniel; Morel, Franck

doi:10.1111/ffe.12699

Cited by 11 publications

(2 citation statements)

References 53 publications

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“…At these locations shear stress amplitude is small compared to normal stress, as already reported in Figure 6.9. Moreover, at these locations, there is a competition between the negative effect of damage and the beneficial effect of hardening [174]. In addition, the Dang Van locus should be modified at the high hydrostatic region, it should be derived from fatigue tests performed on notched specimens and account for the positive effect of hardening [175].…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…14. Moreover, at these locations, there is a competition between the negative effect of damage and the beneficial effect of hardening [56]. In addition, the Dang Van locus should be modified at the high hydrostatic region, it should be derived from fatigue tests performed on notched specimens and account for the positive effect of hardening [57].…”

Section: Qualitative Comparisonmentioning

confidence: 99%

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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