BAMOS

Behaviour and ageing of mooring using synthetic rope

Contexte

Synthetic ropes offer a promising mooring solution for floating systems, in particular wind turbines, with lower loads and reduced seabed footprint. However, they show complex tension-elongation behaviours which differs for instantaneous and long-term loadings, in function of the material used. Among these synthetic fibres, polyamide is of interest to lower the peak tension in the mooring lines, especially in shallow waters.

During previous projects, the understanding and modelling of the complex mechanical behaviour of polyamide ropes was significantly improved. However, some questions still need to be solved for a long-term use with high level of reliability.

Objective

To improve the modelling of short- and long-term behaviour of nylon ropes and expand the knowledge on fatigue and degradation mechanisms

Scientific content

In-depth modelling of polyamide ropes

• Development of a meso-scale model • Enhancement of 1D behaviour law for rope • Experimental campaigns

Investigations on fatigue mechanisms

• Extension of the fatigue curve at low tension range • Fatigue prediction method using self-heating approach • Investigation on the influencing parameters of the fatigue curve • Challenge a new criterion for fatigue prediction

Validation of polyamide rope behaviour law and degradation

• Laboratory validation of behaviour law on a full-scale rope • Impact of selected rope model on mooring design • Extended sea trials, review of degradation rope mechanisms, ropes inspection and tests after dismantling

Expected results

Validated meso-scale model for different construction patterns
Fatigue prediction method using self-heating approach, including a new challenged fatigue criterion
Fatigue curve extended towards high number of cycles, and assessment of parameters influencing fatigue
Validated polyamide rope behaviour law after 1 year of mooring service, numerical study on optimisations made possible by this law
State of the art and feedback on degradation mechanisms

Fiche du projet

Pitch vidéo

Webinaire

Rapports publics

Conclusion

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Partners

This project is led by France Energies Marines and ENSTA.

Funding

This project receives French State funding managed by the National Research Agency under the France 2030 investment plan (ANR-10-IEED-0006-34). It also receives financial support from the Brittany, Pays de La Loire and SUD Provence-Alpes-Côte d’Azur regions.