TY - GEN
T1 - Multiaxial fatigue analysis of mooring chain links under tension loading
T2 - ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2018
AU - Perez, Imanol Martinez
AU - Bastid, Philippe
AU - Constantinescu, Andrei
AU - Venugopal, Vengatesan
N1 - Funding Information:
The work presented in this paper has been carried out under a PhD sponsored by TWI Ltd and University of Edinburgh at NSRIC (National Structural Integrity Research Centre). The main author would like to thank these institutions for this opportunity. The guidance and comments from Philip Smedley (BP Exploration), Øystein Gabrielsen (Statoil) and Yanhui Zhang (TWI Ltd) have been of great help.
Funding Information:
1The work presented in this paper was carried out as part of a PhD at the University of Edinburgh and sponsored by TWI Ltd.
Publisher Copyright:
© 2018 ASME.
PY - 2018/9/25
Y1 - 2018/9/25
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85055569672&partnerID=8YFLogxK
U2 - 10.1115/OMAE2018-77552
DO - 10.1115/OMAE2018-77552
M3 - Conference contribution
AN - SCOPUS:85055569672
VL - 3
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
BT - ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
PB - American Society of Mechanical Engineers(ASME)
Y2 - 17 June 2018 through 22 June 2018
ER -