Blar i NTNU Open på forfatter "Johanson, Audun"
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Effect of Geometrical Irregularities on Fatigue of Lead Sheathing for Submarine High Voltage Power Cable Applications
Moreno, Edgardo; Viespoli, Luigi Mario; Johanson, Audun; Wan, Di; Alvaro, Antonio; Soma, Aurelio; Berto, Filippo (Peer reviewed; Journal article, 2021)High voltage subsea power cables are typically composed of several layers, including: a conductive core, a dielectric layer, a ductile metallic watertight barrier and a series of radial and axial armours and polymer layers. ... -
Effect of Vanadium on Grain Refinement of Aluminium
Johanson, Audun (Master thesis, 2013)Today, grain refinement of aluminium is effectively achieved by inoculation. The performance of the inoculants, as well as further growth restriction in the liquid metal, can be affected by alloy- elements and impurities. ... -
Experimental and numerical investigation of strain distribution of notched lead fatigue test specimen
Johanson, Audun; Viespoli, Luigi Mario; Nyhus, Bård; Alvaro, Antonio; Berto, Filippo (Journal article; Peer reviewed, 2018)The work here presented focuses on the test methodology related to effect of stress concentrators in strain controlled structures. Cable sheathing as used in subsea power cables are investigated by cyclic fatigue testing, ... -
Impact of conductor assembly indentation on the fatigue properties of copper power cable wires
Viespoli, Luigi Mario; Johanson, Audun; Dumoulin, Stephane; Hagen, Anette Brocks; Wan, Di; Berto, Filippo; Alvaro, Antonio (Peer reviewed; Journal article, 2022)The production process of high voltage power cables includes the assembly of the conductor, which is composed of different layer of independent wires wound in helixes of opposite pitch for each subsequent layer. Each wire, ... -
In-situ tensile and fatigue behavior of electrical grade Cu alloy for subsea cables
Wan, Di; Hagen, Anette Brocks; Viespoli, Luigi Mario; Johanson, Audun; Berto, Filippo; Alvaro, Antonio (Peer reviewed; Journal article, 2022)Distribution of electrical energy through subsea power cables has an increasingly important role in the renewable power generation. The majority of the subsea cables uses copper (Cu) as a conductor material. Cables suspended ... -
Room temperature creep mechanism of a Pb-Sn-Sb lead alloy
Viespoli, Luigi Mario; Johanson, Audun; Alvaro, Antonio; Nyhus, Bård; Berto, Filippo (Journal article; Peer reviewed, 2019)Lead alloys are the most common materials adopted for the production of subsea power cable sheathing. The sheathing is a layer of stable and watertight metal, which serves to prevent the electrical failure of the cable. ... -
Small and Full-Scale Fatigue Testing of Lead Cable Sheathing
Johanson, Audun; Viespoli, Luigi Mario; Alvaro, Antonio; Berto, Filippo (Journal article, 2019)The fatigue behavior of a PbSnSb alloy used in subsea power cable sheathing was studied using small- and full-scale experiments. The aim of the work was to understand the transferability between the scales and suitable ... -
Strain controlled medium cycle fatigue of a notched Pb-Sn-Cd lead alloy
Viespoli, Luigi Mario; Johanson, Audun; Alvaro, Antonio; Nyhus, Bård; Berto, Filippo (Journal article; Peer reviewed, 2019)During the extrusion process of subsea power cable sheathing layer it is possible that metallic and/or non-metallic debris present in the processing environment enter the metal lattice originating discontinuities that might ... -
Subsea power cable sheathing: an investigation of lead fatigue performance
Viespoli, Luigi Mario; Johanson, Audun; Alvaro, Antonio; Nyhus, Bård; Berto, Filippo (Peer reviewed; Journal article, 2020)The protection of subsea power cables against electrical failure is achieved by the use of a watertight layer. Due to its properties of chemical stability and ductility, lead has been the material of choice for this purpose ... -
Tape winding angle influence on subsea cable sheathing fatigue performance
Viespoli, Luigi Mario; Panza, Luigi; Johanson, Audun; Alvaro, Antonio; Soma, Aurelio; Berto, Filippo (Peer reviewed; Journal article, 2020)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 ... -
Tensile and fatigue behavior of a Pb-Sn-Sb alloy investigated via small-scale in-situ mechanical testing in SEM
Wan, Di; Viespoli, Luigi Mario; Johanson, Audun; Hagen, Anette Brocks; Berto, Filippo; Alvaro, Antonio (Peer reviewed; Journal article, 2020)Pb-Sn-Sb alloys (E-alloy) are commonly used in subsea power cable sheathing. Due to the relatively low melting temperature, i.e. around 600 K, this type of alloy is prone to experience microstructural time-dependent evolution ... -
Tensile characterization of a lead alloy: creep induced strain rate sensitivity
Viespoli, Luigi Mario; Johanson, Audun; Alvaro, Antonio; Nyhus, Bård; sommacal, alberto; Berto, Filippo (Journal article; Peer reviewed, 2018)The aim of this work is to investigate and define the tensile properties of cable sheathing lead alloy. In particular its strain rate sensitivity due to the pronounced creep already present at room temperature, in relation ...