Browsing NTNU Open by Author "Alvaro, Antonio"
Now showing items 1-20 of 43
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3D Cohesive Modelling of Hydrogen Embrittlement in the Heat Affected Zone of X70 Steel
Alvaro, Antonio (Doktoravhandlinger ved NTNU, 1503-8181; 2014:53, Doctoral thesis, 2014) -
A uniform hydrogen degradation law for high strength steels
Yu, Haiyang; Olsen, Jim Stian; Alvaro, Antonio; Olden, Vigdis; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2016)The degrading effect of hydrogen on high strength steels is well recognized. The hydrogen degradation is dependent not only on hydrogen content, but also on geometric constraints or equivalently, level of stress triaxiality, ... -
Cohesive zone simulation of grain size and misorientation effects on hydrogen embrittlement in nickel
Yu, Haiyang; Olsen, Jim Stian; Olden, Vigdis; Alvaro, Antonio; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2017)The size and misorientation effects on hydrogen embrittlement of a four grain nickel aggregate are studied with the help of hydrogen informed cohesive zone model. The grain misorientation angle is parameterized by fixing ... -
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 ... -
Defining Local Stress-Strain Fields in Ductile Components under Cyclic Loading
Hofgaard, Marthe Elise (Master thesis, 2018)Subsea power cables consist of an extruded lead alloy sheathing, which act as a protective layer against water penetration. The lack of research and framework for advanced fatigue calculations of lead has made it difficult ... -
Digital Image Correlation Technique to Aid Monotonic and Cyclic Testing in a Noisy Environment during In Situ Electrochemical Hydrogen Charging
Myhre, Aleksander Omholt; Sendrowicz, Aleksander; Alvaro, Antonio; Vinogradov, Alexei (Peer reviewed; Journal article, 2022)Hydrogen is receiving growing interest as an energy carrier to facilitate the shift to a green economy. However, hydrogen may cause the significant degradation of mechanical properties of structural materials, premature ... -
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 Hydrogen on Fatigue Crack Growth in Modern Pipe Steels for Hydrogen Transport
Askeli, Brage (Master thesis, 2021)Det eksisterende olje- og gass-nettverket på norsk sokkel representerer i lys av den pågående energirevolusjonen fremtidige transportruter for hydrogen. Hydrogen er kjent for å svekke de mekaniske egenskapene til stål og ... -
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, ... -
EXPERIMENTAL AND NUMERICAL INVESTIGATIONS OF A LEAD ALLOY USED IN SUBSEA POWER CABLE
Sommacal, Alberto (Master thesis, 2018)Subsea Power Cable are used to carry electric power in marine environment, where are commonly installed on the seabed. The internal conductor is wrapped by electric insulation and several protective layers, among these a ... -
Experimental characterization of cyclic behaviour of pure lead: temperature sensitivity and strain-rate effects
Solfiti, Emanuele; Viespoli, Luigi Mario; Lervåg, Malin; Kristensen, Tore Andre; Esposito, Raffaele; Calviani, Marco; Ximenes, Rui; Berto, Filippo; Alvaro, Antonio (Journal article; Peer reviewed, 2023)Proton beam pulses with an energy of 20 GeV/c collide with a pure-lead based target installed in the neutron Time-Of-Flight facility (n_TOF) at the European Laboratory for Particle Physics (CERN). The interaction between ... -
Fatigue Design of Cables for Energy Transport
Meinseth, Katrine (Master thesis, 2020)Under vann brukes strømkabler til å distribuere strøm til offshoreinstallasjoner. Strømkablene består av innvendige strømledere som er beskyttet av flere lag med materiale. Ekstruderte blyhylser fungerer som et beskyttende ... -
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 ... -
FIB-SEM investigation and uniaxial compression of flexible graphite
Solfiti, Emanuele; Wan, Di; Celotto, Ambra; Solieri, N.; Muñoz, P.A.; Ximenes, R.F.; Heredia, J.M.; Torregrosa Martin, Martin; Perillo-Marcone, A.; Nuiry, F.X.; Alvaro, Antonio; Berto, Filippo; Calviani, M. (Peer reviewed; Journal article, 2023)Flexible graphite (FG) with ρ = 1 g/cm3 density is a type of highly porous and anisotropic graphite, mainly used for gaskets and sealing applications, but also suitable for energy absorption, such as in the beam dumping ... -
Flexible graphite as beam dumping material in the TDE blocks of the Large Hadron Collider
Solfiti, Emanuele; Berto, Filippo; Calviani, Marco; Perillo-Marcone, Antonio; Heredia, Jorge Maestre; Alvaro, Antonio; Torregrosa, Claudio (Peer reviewed; Journal article, 2020)The Large Hadron Collider (LHC) is a high energy particle collider at the European Laboratory for Particle Physics (CERN) in Geneva, Switzerland. The LHC Beam Dumping System (LBDS) is composed by different equipment employed ... -
Hydrogen Embrittlement in Fe3%Si, Visited by Nanomechanical Testing and Cohesive Zone Simulation
Olden, Vigdis; Hajilou, Tarlan; Kheradmand, Nousha; Barnoush, Afrooz; Alvaro, Antonio; Osen, Vidar (Chapter, 2016)This work is part of a multi scale computational and experimental approach in which first principle modelling, nanoscale experiments and continuum simulations are combined in order to represent hydrogen induced degradation ... -
Hydrogen Enhanced Fatigue Crack Growth Rates in a Ferritic Fe-3wt%Si Alloy
Alvaro, Antonio; Wan, Di; Olden, Vigdis; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)It is well known that the presence of hydrogen in ferrous materials promotes both static fracture and affect the material fatigue crack growth rates. The latter is often referred to as Hydrogen Enhanced Fatigue Crack Growth ... -
Hydrogen enhanced fatigue crack growth rates in a ferritic Fe-3 wt%Si alloy and a X70 pipeline steel
Alvaro, Antonio; Wan, Di; Olden, Vigdis; Barnoush, Afrooz (Journal article; Peer reviewed, 2019)It is well known that ferrous materials can be damaged by absorption of hydrogen. If a sufficient quantity of hydrogen penetrates into the material, static fracture and the material's fatigue performances can be affected ... -
Hydrogen informed Gurson model for hydrogen embrittlement simulation
Yu, Haiyang; Olsen, Jim Stian; Alvaro, Antonio; qiao, lijie; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2019)Hydrogen-microvoid interactions were studied via unit cell analyses with different hydrogen concentrations. The absolute failure strain decreases with hydrogen concentration, but the failure loci were found to follow the ... -
Hydrogen-assisted fatigue crack growth in ferritic steels – a fractographic study
Wan, Di; Alvaro, Antonio; Olden, Vigdis; Barnoush, Afrooz (Journal article; Peer reviewed, 2018)Fatigue crack growth (FCG) behavior of a Fe-3wt.%Si ferritic alloy under different environmental conditions using in-situ electrochemical (cathodic) hydrogen (H) charging has been investigated. Three frequencies have been ...