Blar i Department of Mechanical and Structural Engineering and Materials Science (TN-IMBM) på emneord "fatigue"
Viser treff 1-20 av 25
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Ageing of ships, LPG tankers
(Masteroppgave/UIS-TN-IKM/2014;, Master thesis, 2015-01-15)During the last decades there have been several major ship accidents, and it is believed that old ships are more unsafe than newer ships. To get a better understanding of this phenomenon the thesis is investigating different ... -
An accurate fatigue damage model for welded joints subjected to variable amplitude loading
(Journal article; Peer reviewed, 2017)Researchers in the past have proposed several fatigue damage models to overcome the shortcomings of the commonly used Miner's rule. However, requirements of material parameters or S-N curve modifications restricts their ... -
Analysis of forces in a subsea wellhead system supported by NeoDrill conductor anchor node
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06-15)During drilling operations the marine drilling riser is exposed to environmental loads like waves and currents, as well as loads from the rig. These environmental loads are transferred from the riser to the wellhead system. ... -
Analysis of mooring wire rope termination with respect to bending fatigue
(Masteroppgave/UIS-TN-IKM/2014;, Master thesis, 2014-06-16)Mooring lines that are used on floating offshore units are subjected to bending at the end termination. Over-bending in some cases may cause the mooring line to suffer damage from fatigue. A countermeasure for this ... -
Applying a machine learning method for cumulative fatigue damage estimation of the IEA 15MW wind turbine with monopile support structures
(Peer reviewed; Journal article, 2023)Offshore support structures are critical for offshore bottom-fixed wind turbines, as they bear nearly all the mass and loading of wind turbine systems. In addition, the support structures are generally subjected to a harsh ... -
Comparative study of deterministic and probabilistic fatigue assessment methods
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06-15)The subject of this thesis is to compare the use of a deterministic and probabilistic assessment methods in fatigue analysis. The thesis focuses on the nominal stress method in the stresslife approach. Three different ... -
Detectability of fatigue cracks in metals.
(Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020)The repetitive cyclic loading are the main cause of fatigue in metals and consequently their failure. Furthermore, the defects due to fatigue such as surface breaking and sub-surface, drastically effects the integrity of ... -
Evaluation of SCFs for stiffened tubular joints
(Masteroppgave/UIS-TN-IKM/2015;, Master thesis, 2015-06)In this thesis the field of stress concentration factors for use in fatigue analysis is explored. The focus is on stiffened tubular joints, which are common on offshore structures. An analysis methodology is established ... -
Experimental and numerical study of the elastic SCF of tubular joints
(Peer reviewed; Journal article, 2021-07)This paper provides data on stress concentration factors (SCFs) from experimental measurements on cruciform tubular joints of a chord and brace intersection under axial loading. High-fidelity finite element models were ... -
Experimental Investigation of Al-CuMgMn Alloy Developed by Laser Beam Surface Modification for Wear Resistance
(Peer reviewed; Journal article, 2021-04)Laser surface alloying is one of the recent technologies used in the manufacturing sector for improving the surface properties of metals. Aluminum alloys are key materials in the manufacturing sector. This favors their ... -
Fatigue Analysis of Inter-Array Power Cables between Two Floating Offshore Wind Turbines Including a Simplified Method to Estimate Stress Factors
(Peer reviewed; Journal article, 2023-06)The use of floating offshore wind farms for electrical energy supply is expected to rise significantly over the coming years. Suspended inter-array power cables are a new design to connect floating offshore wind turbines ... -
Fatigue analysis of offshore wind turbine
(Masteroppgave/UIS-TN-IKM/2012;, Master thesis, 2012)In this master thesis analyses will be conducted on a 5MW offshore wind turbine, with a jacket foundation. The goal is to investigate how seven different wind profiles affect fatigue in the blade root, the tower top and ... -
Fatigue life analysis of wheel-rail contacts at railway turnouts using finite element modelling approach
(Peer reviewed; Journal article, 2021)The article deals with wheel-rail contact analysis at railway turnout using a finite element modelling approach. The focus is understanding the wheel-rail contact problems and finding the means of reducing these problems ... -
Fatigue of service pipes
(Masteroppgave/UIS-TN-IKM/2012;, Master thesis, 2012)The first part of this thesis will present the principle of fatigue, vibration and damping of service pipes on the Norwegian continental shelf. Thus us used for the creation of a screening methodology for prioritizing ... -
Fatigue of Structural and Additively Manufactured Steels: Damage Assessment and Modelling Techniques
(PhD thesis UiS;, Doctoral thesis, 2022-09)The topics of damage assessment by in situ measurements before a macroscopic crack has been initiated, nonlinear damage modelling and additive manufacturing are herein discussed and researched from the perspective of the ... -
Fatigue strength degradation of metals in corrosive environments
(Journal article; Peer reviewed, 2017)Structures exposed to aggressive environmental conditions are often subjected to time-dependent loss of coating and loss of material due to corrosion; this causes reduction in the cross-sectional properties of the members, ... -
Implementation of linear, double-linear, and nonlinear fatigue damage accumulation rules for fatigue life prediction of offshore drilling top-drive tie-rods
(Peer reviewed; Journal article, 2019-11)The offshore oil and gas industry has been exposed to major challenges over the last decade, particularly demanding cost cuts and more effective technical solutions. Predictive systems and remaining life assessments for ... -
Investigation of Material Property changes in HSLA Steel due to Weld Proximity
(Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-09-15)Standards and specifications apply a rule of thumb when determining the distance of two adjacent weld joints, but they rarely give any clear technical justification for the predetermined values. It is vital to understand ... -
Life extension of offshore structures : A conceptual framework and fatigue damage models
(PhD thesis UiS;, Doctoral thesis, 2019-09)Many offshore structures worldwide are approaching or have already exceeded their original design life. It is important to use the existing infrastructure efficiently and to estimate remaining service life accurately. ... -
Load sequence effects and mixed-mode fatigue crack growth in offshore structures
(PhD thesis UiS;, Doctoral thesis, 2019-12)An increasing number of the offshore structures in the North Sea are being operated in a life extension phase, which means that their original design life has been exceeded. As the structures age, they are deteriorating, ...