Influence of grease lubrication on freeting-fatigue damages of steel wire ropes

• Main Authors: Montalvo, S., Fouvry, Siegfried, Martinez, Mickael
• Other Authors: École Centrale de Lyon (ECL), Université de Lyon, Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne (ENISE)-Centre National de la Recherche Scientifique (CNRS), IFP Energies nouvelles (IFPEN), ASME
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2022
• Subjects: [SPI]Engineering Sciences [physics]; Arctic
• Online Access: https://hal.science/hal-03875077; https://hal.science/hal-03875077/document; https://hal.science/hal-03875077/file/OMAE2022-79102-montalvo_fouvry_martinez.pdf

International audience Steel wire ropes can be used as mooring lines for Floating Offshore Wind Turbines. Swell induces tension and bending in the line. Investigating the effects of combined loads on rope lifetime is necessary. In these cases, fretting-fatigue damage is considered to be one of the main causes of failure. To prevent corrosion, grease is injected in the rope. The effect of grease on the fretting-fatigue damage of two wires in contact was investigated. A multi-scale approach was applied to calculate representative local loads in the mooring ropes. Global tension and bending were applied to a detailed model of the rope to calculate the local stress and contact forces in the steel wires. These are the fretting-fatigue loads applied in the laboratory tests. Two series of fretting-fatigue tests were conducted, each one with clean and greased wires. A two actuators hydraulic rig was used, allowing for complete decoupling of the fretting and fatigue loads. In the first series, the fatigue load was kept constant, and the fretting load was changed. In partial slip regime, for small fretting amplitudes, greased wires have longer lifetimes than non-greased wires. In a second series of frettingfatigue tests, this most critical fretting condition was used and kept constant, and the fatigue load was changed. Results show that the fatigue limits of clean and greased wires are equal.