Browsing NTNU Open by Author "Nyhus, Bård"
Now showing items 1-19 of 19
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A special notched tensile specimen to determine the flow stress-strain curve of hardening materials without applying the Bridgman correction
Tu, Shengwen; Ren, Xiaobo; Nyhus, Bård; Akselsen, Odd Magne; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2017)Structural integrity assessment of weldments requires the input of flow stress-strain curve of each individual material zone. To cope with these challenges, a cylindrical cross weld tensile specimen with a notch located ... -
Additive manufacture of superduplex stainless steel using WAAM
Eriksson, Magnus Carl Fredrik; Lervåg, Malin; Sørensen, Camilla; Robertstad, Andreas; Brønstad, Bård M.; Nyhus, Bård; Aune, Ragnhild; Ren, Xiaobo; Akselsen, Odd Magne (Journal article; Peer reviewed, 2018)Superduplex stainless steels have been used in the oil and gas industry for a couple of decades due to the combination of excellent mechanical properties and corrosion resistance. The present investigation addresses the ... -
Additive Manufacturing with Superduplex Stainless Steel Wire by CMT Process
Lervåg, Malin; Sørensen, Camilla; Robertstad, Andreas; Brønstad, Bård M.; Nyhus, Bård; Eriksson, Magnus Carl Fredrik; Aune, Ragnhild; Ren, Xiaobo; Akselsen, Odd Magne; Bunaziv, Ivan (Journal article; Peer reviewed, 2020)For many years, the oil and gas industry has utilized superduplex stainless steels due to their high strength and excellent corrosion resistance. Wire arc additive manufacturing (WAAM) was used with superduplex filler wire ... -
Complete Simulation Models to Describe the Ductile-to-Brittle Transition of Steels for Arctic Applications - A Beremin-Gurson Approach
Scheide, Henrik Andre (Master thesis, 2018)The toughness of common structural steels is often affected by temperature changes where low service temperatures frequently promote brittle material characteristics. Low service temperatures often occur in the Arctic ... -
Effect of low temperature tensile properties on crack driving force for Arctic applications
Dahl, Bjørn Augdal; Ren, Xiaobo; Akselsen, Odd Magne; Nyhus, Bård; Zhang, Zhiliang (Journal article; Peer reviewed, 2017)Many petroleum companies expand their activities further north towards the Arctic region, resulting in design temperatures down to −60 °C, which is much lower than what is usual for most current petroleum installations. ... -
Effect of Sigma Phase in Wire Arc Additive Manufacturing of Superduplex Stainless Steel
Akselsen, Odd Magne; Bjørge, Ruben; Ånes, Håkon Wiik; Ren, Xiaobo; Nyhus, Bård (Peer reviewed; Journal article, 2021)In the present study, the thermal program in wire and arc additive manufacturing has been varied in terms of heat input and interpass temperature. Three walls were completed with subsequent Charpy V impact toughness and ... -
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, ... -
Fatigue investigation of complex weldments by the means of the local strain energy density approach
Viespoli, Luigi Mario; Alvaro, Antonio; Nyhus, Bård; Berto, Filippo (Journal article; Peer reviewed, 2018)The paper investigates the use of an energetic approach based on the strain energy density failure criteria to predict the fatigue life of welded joints in aluminum alloy. The cited criterion has already been proved valid ... -
Fracture toughness and hydrogen embrittlement susceptibility on the interface of clad steel pipes with and without a Ni-interlayer
Jemblie, Lise; Bjaaland, Helena; Nyhus, Bård; Olden, Vigdis; Akselsen, Odd Magne (Journal article, 2017)The objective of the present work has been to study the fracture properties of the interface between clad and base material of two 316 L austenitic stainless steel - X60/X65 carbon steel hot roll bonded clad pipes; with ... -
Low-temperature fatigue life properties of Aluminum butt weldments by the means of the local strain energy density approach
Viespoli, Luigi Mario; Leonardi, Andrea; Cianetti, Filippo; Nyhus, Bård; Alvaro, Antonio; Berto, Filippo (Journal article; Peer reviewed, 2019)The paper investigates the use of the strain energy density evaluated on a finite control volume as a mean to the fatigue life prediction for double V‐groove but joints. The specimens are manufactured by metal active gas ... -
Material and Fatigue Life Investigation of a Lead Alloy used as Sheathing in Subsea Power Cables
Fotland, Gaute (Master thesis, 2017)Subsea power cables are used to transport electricity offshore. They consist of several layers, where a lead sheathing is used as the water barrier layer. From reeling and installation, in addition to daily cycles from ... -
Materials testing and characterization of four X60-X65 pipeline steels
Alvaro, Antonio; Hagen, Anette Brocks; Lervåg, Malin; Nyhus, Bård; Olden, Vigdis (SINTEF Rapport;, Research report, 2020)The report summarizes the main results from the slow strain rate tensile testing campaign performed within the framework of the HyLINE project. The metallurgical characterization of the pipe, in terms of base metals (BM), ... -
Mechanical characterization of aluminum alloys for arctic structures application
Viespoli, Luigi Mario; Midling, Ole Terje; Alvaro, Antonio; Nyhus, Bård; Berto, Filippo (Journal article, 2020)Due to its low specific mass, mechanical resistance comparable to that of mild structural steels, the low maintenance cost and good corrosion resistance, aluminum alloys are well suited for the production of offshore ... -
Microstructure and Properties of Wire Arc Additive Manufacturing of Inconel 625
Akselsen, Odd Magne; Bjørge, Ruben; Ånes, Håkon Wiik; Ren, Xiaobo; Nyhus, Bård (Journal article; Peer reviewed, 2022)In the present investigation, wire arc additive manufacturing of Inconel 625 was carried out with the cold metal transfer variant of the metal inert gas process. The heat input varied between 0.46 and 0.63 kJ/mm, which is ... -
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. ... -
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 ... -
A study on the influence of impurity content on fatigue endurance in a 6082 Al-alloy
Sarkar, Aritra; Aktunali, Mehmet; Arbo, Siri Marthe; Holmestad, Jon; Viespoli, Luigi Mario; Nyhus, Bård; Ringen, Geir; Razavi, Nima (Peer reviewed; Journal article, 2024)The paper investigates the influence of different impurity/scrap elements on the high cycle fatigue (HCF) properties of 6082 Al-alloy. Accordingly, HCF tests are carried out on the different variants- GA1, GA2 and GA3 ... -
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 ... -
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 ...