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Bitumen Shear Mechanics in a Dynamic Subsea Electrical Cable

[+] Author Affiliations
Jonathan Mullins, Daniel Morin, Johan Ekh

ABB Corporate Research, Västerås, Sweden

Andreas Tyrberg, Claes Sonesson

ABB High Voltage Cables, Karlskrona, Sweden

Paper No. OMAE2015-41110, pp. V05AT04A026; 8 pages
doi:10.1115/OMAE2015-41110
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 5A: Pipeline and Riser Technology
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5651-2
  • Copyright © 2015 by ASME

abstract

The bending mechanics of dynamic subsea electrical cables are strongly influenced by the frictional shear interactions that exist between the armour wires and surrounding materials. In some cases the armour wires are clad with bitumen filler material so that the shear mechanics of bitumen are important to the overall bending mechanics of the cable. In this work the shear mechanics of bitumen are studied. Pull-out tests on bitumen-clad armour wires were conducted in-situ on a stub of a dynamic subsea electrical test cable. Test temperatures ranged from 0°C to room temperature and shear velocities ranged from 0.1mm/min to 40mm/min. A thermally activated model of the bitumen shear interaction, incorporating temperature, speed and displacement dependence was proposed and implemented into a finite element code. The testing and modelling was then extended to incorporate the effects of cyclic loading. The bitumen response was highly sensitive to test temperature, applied velocity and cyclic loading with the shear strength varying by approximately two orders of magnitude over the range of conditions studied. The experimental results and model predictions indicate that the shear mechanics of cables containing bitumen clad armour wires differ from the shear mechanics of cables that do not. The bending stiffness displays a velocity and temperature dependence and relaxation of cable stresses is expected during holding events. Because of this, it is recommended that modelling of bitumen clad armour wires be conducted using a suitable bitumen interaction model and not a classic friction model.

Copyright © 2015 by ASME

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