Ove Mikkelsen
University of Stavanger
Service lifeAeroelasticityEngineeringFatigue limitFinite element methodNonlinear systemComposite materialSubmarine pipelineEurocodeMaterials scienceWeldingCorrosionFatigue damageRemaining lifeMathematicsComputer scienceLife extensionFracture mechanicsStructural engineeringForensic engineering
14Publications
5H-index
69Citations
Publications 15
Newest
#1Mostafa Atteya (University of Stavanger)
#2Ove Mikkelsen (University of Stavanger)H-Index: 5
Last. Gerhard Ersdal (University of Stavanger)H-Index: 8
view all 4 authors...
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 generated and validated against these measurements. Further, the statistical variation and the uncertainty in both experiments and finite element analysis (FEA) are studied, including the effect of finite element modelling of the weld profile, mesh size, element type and the metho...
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#1Hirpa G. Lemu (University of Stavanger)H-Index: 11
#2Ove MikkelsenH-Index: 5
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#1Mostafa Atteya (University of Stavanger)
#2Ove Mikkelsen (University of Stavanger)H-Index: 5
Last. Gerhard ErsdalH-Index: 8
view all 4 authors...
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#1Ashish Aeran (University of Stavanger)H-Index: 3
#2Ruth Acosta (University of Applied Sciences, Kaiserslautern)H-Index: 6
Last. Frank Walther (Technical University of Dortmund)H-Index: 25
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Abstract Miner’s rule is commonly used in fatigue life estimations and is also recommended by design standards. Recently, a few models have been proposed, to capture loading sequence effects more precisely than Miner’s rule. However, practical applications of these models have not been found, due to the requirement for additional material parameters. The authors have recently proposed a nonlinear fatigue damage model, which does not require any additional material parameters, other than the S-N ...
2 CitationsSource
#1F GhebretinsaeH-Index: 1
#2Ove MikkelsenH-Index: 5
Last. A D AkessaH-Index: 1
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A study of strength of composite materials produced by 3D printing technology is presented. The samples fabrication and tests to determine the strength both in bending and in tension of the composite materials have been carried out. The composite samples were additively manufactured using Markforged® 3D printer of type Mark-Two. The fabricated composite samples were of carbon fiber filament combined with a thermoset plastic matrix, by its producer named "Onyx". The tests provided sample mean val...
4 CitationsSource
#1Mostafa Atteya (University of Stavanger)
#2Ove Mikkelsen (University of Stavanger)H-Index: 5
Last. Hirpa G. Lemu (University of Stavanger)H-Index: 11
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Offshore structures are conventionally designed for a service life between 20-30 years and mostly used beyond their service life. They are operated up to the point where costs of operations, maintenance and repair exceed the revenue generated by the offshore structure. The cyclic nature of environmental loading induces multi-axial stresses with high gradients in welded tubular joints that lead to fatigue cracks emanating from imperfections in the welded materials. Tubular joints may exhibit sign...
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#1Ashish AeranH-Index: 3
Last. Ivar LangenH-Index: 7
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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 practical applications. Also, application of most of these models under variable amplitude loading conditions have not been found. To overcome these restrictions, a new fatigue damage model is proposed in this paper. The proposed model can be applied by practicing engineers using...
3 CitationsSource
#1F H ØyasæterH-Index: 1
#2Ashish AeranH-Index: 3
Last. Ove MikkelsenH-Index: 5
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Offshore installations are subjected to harsh marine environment and often have damages from corrosion. Several experimental and numerical studies were performed in the past to estimate buckling capacity of corroded tubular members. However, these studies were either based on limited experimental tests or numerical analyses of few cases resulting in semi-empirical relations. Also, there are no guidelines and recommendations in the currently available design standards. To fulfil this research gap...
2 CitationsSource
#1Ove Mikkelsen (University of Stavanger)H-Index: 5
#2Jasna Bogunović Jakobsen (University of Stavanger)H-Index: 10
2 CitationsSource
#1Ashish Aeran (University of Stavanger)H-Index: 3
#2Sudath C. Siriwardane (University of Stavanger)H-Index: 10
Last. Ivar Langen (University of Stavanger)H-Index: 7
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Abstract The structural integrity assessment of ageing structures for possible life extension has been identified as a growing challenge in the oil and gas industry worldwide. Although the available guidelines provide a general assessment process, it is necessary to have more detailed guidelines. This can be achieved by adding relevant theories and models which can capture time-dependent structural degradation more precisely. To address this, a new framework for possible life extension is propos...
14 CitationsSource