Characterization of the mechanical properties of low stiffness marine power cables through tension, bending, torsion, and fatigue testing
Artikel i vetenskaplig tidskrift, 2023

The exploitation and harnessing of offshore marine renewable energy have led to an increased demand for reliable marine power cables with long service lives. These cables constitute a considerable share of the total installation cost of offshore renewable energy facilities and have high maintenance and repair costs. The critical characteristics of these power cables must be determined to reduce the risk of exceeding their ultimate strength or fatigue life, which can result in unwanted and unexpected failures. This study investigates dynamic marine power cables that are suitable for application in devices that harness energy from ocean currents, waves, and tides. Tension, bending, torsion, and fatigue tests were conducted on three dynamic power cables (1 kV, 3.6 kV, and 24 kV) that have high flexibility, i.e., low mechanical stiffness. The specimen lengths and axial pretension force were varied during the tests. The results are discussed in terms of the mechanical fatigue degradation and ultimate design load, and the key observations and lessons learned from the tests are clarified. The study’s main contribution is the results from physical component testing of the dynamic marine power cables without metallic armors, which can be used to calibrate numerical models of this type of dynamic marine power cable in the initial design of, e.g., inter-array cables between floating wave energy converters. The benefits offered by this type of cable and the importance of the results for creating reliable numerical simulation models in the future are highlighted.

axial stiffness

bending stiffness

mechanical testing

fatigue testing

torsion stiffness

dynamic cable

marine power cables

fiber optics sensor

Författare

Jonas Ringsberg

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Lamine Dieng

Université Gustave Eiffel

Zhiyuan Li

Chalmers, Mekanik och maritima vetenskaper, Marin teknik

Ingvar Hagman

NKT Cables AB

Journal of Marine Science and Engineering

20771312 (eISSN)

Vol. 11 9 1791

Havsormen

Energimyndigheten (48845-1), 2019-12-10 -- 2021-10-31.

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Ämneskategorier

Teknisk mekanik

Farkostteknik

Metallurgi och metalliska material

Styrkeområden

Energi

Materialvetenskap

Fundament

Grundläggande vetenskaper

DOI

10.3390/jmse11091791

Mer information

Senast uppdaterat

2023-10-13