Tension/Torsion Behavior of Deepwater Synthetic Mooring Lines

Davies, Peter; Bouquet, Pascal; Conte, Marcello; Deuff, A.

doi:10.4043/17872-ms

Cited by 7 publications

(4 citation statements)

References 4 publications

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“…The same relative classification of the post bedding-in strain for each BI was expected. It has been observed previously (Davies et al, 2006;Humeau, 2017;Liu et al, 2014) that the rope's construction influences the bedding-in behavior. The fact that filament post bedding-in strain is not zero shows that the material (fiber) history also influences the global behavior.…”

Section: Comparisonmentioning

confidence: 86%

“…These models are based on the geometries and the properties of each scale, and friction is also considered in some of them. (Davies et al 2006) applied Leech's model and found a good correlation of tension/torsion properties for results on full size long rope samples. Braided ropes have received less attention than stranded ropes, but some researchers have investigated behavior models, in particular (Rawal et al, 2015;Vu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Influence of bedding-in on the tensile performance of HMPE fiber ropes

et al. 2020

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Synthetic fiber ropes are widely used in the maritime industry, with applications from sailboat rigging to offshore platform mooring lines, thanks to their numerous qualities compared to steel cables: light weight, good specific mechanical properties and excellent marine resistance. A key feature of these ropes is their sensitivity to loading history, as this affects subsequent performance. In the present work the influence of the maximum bedding-in load level and the loading path were studied at the different rope component scales (filament, yarn and braided rope), in order to develop an optimal bedding-in procedure for braided ropes. The load levels were: 10%, 30% and 50% of the tensile break load of the sample. From the results obtained, the influence of braid construction and material have been studied, and an efficient bedding-in process has been defined. It was shown that the main parameter is the maximum load level, the loading path is not important. The load required to bed in HMPE ropes is closely related to changes in the braid angle under load. Highlights► Unique results of the influence of bedding in protocol on at different rope scales. ► Influence of bedding-in loading path and loading level on tensile behavior. ► Correlation between fibers reorientation and bedding-in protocols. ► Separation of contributions from material and construction.

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Section: Comparisonmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Influence of bedding-in on the tensile performance of HMPE fiber ropes

et al. 2020

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“…Failure of one or several elements may cause the adjacent elements to fail immediately, resulting in either complete failure or strength loss. Further details can be found in [22][23][24][25].…”

Section: Rope Modellingmentioning

confidence: 99%

Evaluating Mooring Line Test Procedures through the Application of a Round Robin Test Approach

Khalid

Davies

Halswell

et al. 2020

JMSE

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Innovation in materials and test protocols, as well as physical and numerical investigations, is required to address the technical challenges arising due to the novel application of components from conventional industries to the marine renewable energy (MRE) industry. Synthetic fibre ropes, widely used for offshore station-keeping, have potential application in the MRE industry to reduce peak mooring line loads. This paper presents the results of a physical characterisation study of a novel hybrid polyester-polyolefin rope for MRE mooring applications through a round robin testing (RRT) approach at two test facilities. The RRT was performed using standard guidelines for offshore mooring lines and the results are verified through the numerical modelling of the rope tensile behaviour. The physical testing provides quantifiable margins for the strength and stiffness properties of the hybrid rope, increases confidence in the test protocols and assesses facility-specific influences on test outcomes. The results indicate that the adopted guidance is suitable for rope testing in mooring applications and there is good agreement between stiffness characterisation at both facilities. Additionally, the numerical model provides a satisfactory prediction of the rope tensile behaviour and it can be used for further parametric studies.

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“…Leech has developed a modeling framework, which takes into account both the helical geometry and the nonlinear force-strain response of the yarns in a hierarchical modeling approach (Leech, 2002). This is available in a commercial package known as Fiber Rope Modeller, which has proved effective in modeling the tensile response of large rope structures (Leech et al, 1993(Leech et al, , 2003Davies et al, 2006).…”

Section: Aging Of Ropes In Servicementioning

confidence: 99%