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Tape winding angle influence on subsea cable sheathing fatigue performance

Abstract

A fundamental component of subsea power cables is the thin galvanized steel tape winded around the dielectric and sheathing layer in order to prevent permanent thermal cycling induced deformation. The pressure state induced by the resistance offered by such tapes against radial reformation reduces the triaxiality ratio of the stress state of the lead sheathing layer. It is known that a reduced triaxiality has a beneficial effect on ductility and fatigue life of metals. In the present work a series of finite element simulations are performed in presence of galvanized steel tapes at three different winding angles and without such reinforcement at all, obtaining a qualitative indication of its effect on the stress state induced in the sheathing layer. Loading conditions as internal pressure related to thermal dielectric expansion and cable bending are modelled. The numerical qualitative results are discussed in connection to a series of full-scale fatigue tests performed on subsea power cables with and without the support of steel tapes.
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Category

Academic article

Language

English

Author(s)

  • Luigi Mario Viespoli
  • Luigi Panza
  • Audun Johanson
  • Antonio Alvaro
  • Aurelio Soma
  • Filippo Berto

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Politecnico di Torino
  • Norwegian University of Science and Technology
  • Nexans Norway AS

Year

2021

Published in

Engineering structures

ISSN

0141-0296

Volume

229

View this publication at Norwegian Research Information Repository