Browsing NTNU Open by Author "Olsen, Jim Stian"
Now showing items 1-18 of 18
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A new method to estimate the residual stresses in additive manufacturing characterized by point heat source
Sun, Li; Ren, Xiaobo; He, Jianying; Olsen, Jim Stian; Pallaspuro, Sakari; Zhang, Zhiliang (Journal article; Peer reviewed, 2019)Residual stress in additive manufacturing (AM) is one of the key challenges in terms of structural integrity and finish quality of printed components. Estimating the residual stress distribution on additively manufactured ... -
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, ... -
Atomic Insights into Hydrogen-Grain Boundary Interactions
Ding, Yu (Doctoral theses at NTNU;2023:120, Doctoral thesis, 2023)Derived from the most abundant element in the universe, hydrogen is the smallest element and, at the same time, a clean, mobile, and efficient energy carrier. Nowadays, hydrogen is regarded as the fuel of future and could ... -
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 ... -
Connection Between Critical Stress and Hydrogen Content for SDSS under Cathodic Protection
Krosness, Ola Myklatun (Master thesis, 2014)In recent years Super Duplex Stainless Steel (SDSS) installed subsea with cathodic protection has failed during service. The failures have been due to Hydrogen Induced Stress Cracking (HISC). The effect from different ... -
Constitutive behavior and fracture of shape memory alloys: Effect of geometrical inhomogeneities
Olsen, Jim Stian (Doktoravhandlinger ved NTNU, 1503-8181; 2012:57, Doctoral thesis, 2012) -
Designing next generation hydraulic manifolds with minimal material usage and competitive lead times
Hersleth, Henrik Hoen (Master thesis, 2020)Abstract will be available on 2023-06-11 -
Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718
Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy (Journal article; Peer reviewed, 2018)Due to its high strength and acceptable corrosion resistance, Alloy 718 is a viable material for the use in subsea applications. The alloy's susceptibility to hydrogen embrittlement is however limiting its viability. In ... -
Effect of hydrogen on dislocation nucleation in alloy 718
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz (Journal article; Peer reviewed, 2017)In situ electrochemical nanoindentation has been used to study the effect of hydrogen on the nanomechanical response of Alloy 718. Observations show that hardness increase as a result of hydrogen charging. Also, the hydrogen ... -
Effects of loading path on the fracture loci in a 3D space
Yu, Haiyang; Olsen, Jim Stian; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2016)Axi-symmetric and 3D unit cell analyses with continuous non-proportional loading paths are performed to investigate the path dependence of the fracture loci in a 3D space. The loading pattern utilized is the generalization ... -
Environmentally assisted degradation of spinodal copper alloy C72900
Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian (Journal article; Peer reviewed, 2018)In this work, a spinodal Copper alloy – C72900, was tested to investigate the resistance against environmentally assisted degradation. The material was tested according to ISO 15156-3 Level V in sour H2S solution and to ... -
HISC in Super Duplex Stainless Steels: A study of the relation between microstructure and susceptibility to hydrogen induced stress cracking
Andersen, Kjetil (Master thesis, 2013)Testing of susceptibility to hydrogen induced stress cracking (HISC) in two 25% Cr Super Duplex Stainless Steels (SDSS) has been carried out. These were a forged material and a hot isostatically pressed (HIP) material with ... -
Hydrogen embrittlement in steels: predictive models and integrity assessment
Lin, Meichao (Doctoral theses at NTNU;2023:123, Doctoral thesis, 2023)Hydrogen embrittlement (HE) is a well-recognized challenge as it can degrade the mechanical properties of most structural steels, leading to premature failure of hydrogen infrastructures. Continuum scale simulation is an ... -
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 stress cracking and crack initiation in precipitation hardened Ni-alloys
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian (Journal article; Peer reviewed, 2018)The two different precipitation hardened nickel alloys, Alloy 718 and Alloy 725, were tested in its as received condition. Their susceptibility to hydrogen stress cracking was examined by the use of stepwise increasing ... -
Hydrogen-microvoid interactions at continuum scale
Yu, Haiyang; Olsen, Jim Stian; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2018)Experimentally, it has been shown that hydrogen can either enhance the internal necking failure or induce internal shearing failure of microvoids. In this study, the numerical investigation of hydrogen-microvoid interactions ... -
Integrity of Nickel Alloys used for Subsea Applications
Stenerud, Gaute (Doctoral theses at NTNU;2018:287, Doctoral thesis, 2018) -
Viscous regularization for cohesive zone modelling under constant displacement: an application to hydrogen embrittlement simulation
Yu, Haiyang; Olsen, Jim Stian; Olden, Vigdis; Alvaro, Antonio; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2016)The convergence problem during the cohesive zone modelling of hydrogen embrittlement in constant displacement scenario is attributed to the numerical instability which is studied analytically in the present work. The ...