Browsing Institutt for maskinteknikk og produksjon by Title
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Hydraulisk utforming av nedløp fra gateavrenning
(Master thesis, 2015)I denne masteroppgaven er det sett på hvordan den hydrauliske kapasiteten til forskjellige rister varierer med hensyn på helning, vannføring i vegbanen, ristutforming og størrelse. Det er sett på hvordan kapasiteten beregnes ... -
Hydrodynamic Damping of a Fluttering Hydrofoil in High-speed Flows
(Journal article; Peer reviewed, 2018)A hydrofoil resembling a high head Francis runner blade was submerged in a rectangular channel and attached to the walls in a fixed-beam configuration. The hydrofoil was excited by piezoelectric Macrofiber composite actuators ... -
Hydrodynamic Design Principles and Structural Verification of a Hydrofoil Concept for Kiteboarding
(Master thesis, 2022)Bruken av hydrofoiler i kiteboarding har de siste ˚arene blitt stadig mer populært og vil for første gang bli inkludert i de olympiske leker i 2024. Siden oppstarten har den primære utviklingsinnsatsen vært˚a optimalisere ... -
Hydrogen assisted crack growth in iron: a simulations approach
(Doctoral theses at NTNU;2021:32, Doctoral thesis, 2021)Hydrogen enhances crack growth, limiting the lifetime of industrial components. Despite the abundance of research into hydrogen enhanced crack growth and its proposed mechanisms, none of the models can explain all the ... -
Hydrogen Embrittlement as a Conspicuous Material Challenge─Comprehensive Review and Future Directions
(Peer reviewed; Journal article, 2024)Hydrogen is considered a clean and efficient energy carrier crucial for shaping the net-zero future. Large-scale production, transportation, storage, and use of green hydrogen are expected to be undertaken in the coming ... -
Hydrogen embrittlement effect observed by in-situ hydrogen plasma charging on a ferritic alloy
(Journal article; Peer reviewed, 2018)To study the hydrogen embrittlement (HE) effect, a novel in-situ slow strain rate tensile test together with in-situ hydrogen (H) charging by H-plasma was conducted in an environmental scanning electron microscope (ESEM). ... -
Hydrogen Embrittlement in Fe3%Si, Visited by Nanomechanical Testing and Cohesive Zone Simulation
(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 embrittlement in subsea pipelines made from X70: Effect of plastic deformation on hydrogen diffusion
(Master thesis, 2011)As a part of the DEEPIT project at SINTEF, hydrogen permeation tests have been carried out on API X70 pipeline steel. The effect of plastic deformationon hydrogen diffusion properties has been evaluated, using a worldwide ... -
Hydrogen Embrittlement of 25Cr duplex stainless steel exposed to well fluid with H2S - effect of cold working and product form
(Master thesis, 2017)It is known that cold deformation may have detrimental effects on resistance against SulphideStress Cracking/Stress Corrosion Cracking and Hydrogen Induced Stress Cracking. Thoughit is clear that cold deformation should ... -
Hydrogen embrittlement of additively manufactured AlCoCrFeNi2.1 eutectic high-entropy alloy
(Peer reviewed; Journal article, 2022)AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA) was fabricated in as-cast and additively manufactured (AM) states. The hydrogen embrittlement susceptibility of both materials was investigated through in-situ uniaxial tensile ... -
Hydrogen embrittlement of clad steel pipes: Experiments and FE modelling
(Doctoral theses at NTNU;2018:200, Doctoral thesis, 2018)Pipes with an inner layer of corrosion resistant alloy, so called clad pipes, are increasingly used in the oil and gas industry as en economical viable option for corrosion management, combining the mechanical properties ... -
Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens
(Journal article, 2018)The susceptibility of the FeAl intermetallic alloy to hydrogen-assisted cracking was investigated by in situ fracture experiments using notched micrometre-sized specimens using an Environmental Scanning Electron Microscope ... -
Hydrogen embrittlement suceptibility of steel armour wires for flexible pipes
(Peer reviewed; Journal article, 2020)Flexible pipes are frequently used both as flowlines and risers in the oil and gas industry. A flexible pipe has a complex structure consisting of layers of polymer and metallic materials. The armor wire layers – shielded ... -
Hydrogen Enhanced Fatigue Crack Growth Rates in a Ferritic Fe-3wt%Si Alloy
(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
(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 Fireball Consequence Analysis
(Peer reviewed; Journal article, 2020)A fireball may occur after the catastrophic rupture of a tank containing a flammable substance such as a fuel, if an ignition source is present. The fireball is identified by the combustion of the flammable cloud created ... -
Hydrogen Induced Stress Cracking of Additive Manufactured Components made from Alloy 625 and 25Cr Super Duplex Stainless Steel
(Master thesis, 2022)Denne masteroppgaven har som mål å bidra til økt forståelse rundt hvordan 3D-printede komponenter produsert ved selektiv lasersmelting (SLM) blir påvirket av hydrogensprøhet (HISC). Både 25Cr super duplex rustfritt stål ... -
Hydrogen Induced Stress Cracking of Inconel 718 under Cathodic Polarization - Effects of Hydrogen on the Initiation and Propagation of Cracks
(Master thesis, 2015)This work has examined the susceptibility to hydrogen induced stress cracking (HISC) of Inconel 718 (UNS N07718) by stepwise tensile loading tests with in situ cathodic polarization. Specifically, the effect of hydrogen ... -
Hydrogen Induced Stress Cracking Resistance of Nickel Alloy ATI 830
(Master thesis, 2018)The following activities shall be included in the project: ATI 830 1. Document microstructure and mechanical properties for the received alloy. 2. Execute the test program given in Attachment 1. 3. Execute a literature ... -
Hydrogen Induced Stress Cracking susceptibility of strain-hardened Ni alloys Sanicro 35 and Alloy 750 HS
(Master thesis, 2023)I dette arbeidet er mottakeligheten for hydrogenindusert sprekking (HISC) blitt undersøkt og sammenlignet for to arbeidsherdede nikkelbaserte legeringer, Sanicro 35 (UNS N08935) og høystyrket P750 (DIN nr. 1.4675). Dette ...