Kristen Rege
University of Stavanger
Mathematical analysisFinite element methodHammerNonlinear systemComposite materialSubmarine pipelineComputational fluid dynamicsAmplitudeGeotechnical engineeringMaterials scienceTurbulenceVibrationMarine engineeringCorrosionFourier seriesExtended finite element methodOrder (business)OverwrapFluid–structure interactionValue (computer science)Point (geometry)Structural integrityNonlinear modelFatigue testingMixed modeSteel structuresRadial vibrationNumerical estimationFatigue crack propagationSafe operationThin walledFatigue damageLinear elasticityMathematicsTorsion (mechanics)Flow (mathematics)Computer scienceFracture (geology)ComputationFinite volume methodPolymerStress intensity factorVibration fatigueMechanicsFracture mechanicsStructural engineeringParis' lawFibre-reinforced plasticNatural frequencyStructural systemFluid dynamics
Publications 8
#1Kristen Rege (University of Stavanger)H-Index: 5
#2Jørgen Grønsund (University of Stavanger)H-Index: 1
Last. Dimitrios G. Pavlou (University of Stavanger)H-Index: 9
view all 3 authors...
Abstract Environmental loads acting on structures usually cause fatigue crack propagation under variable amplitude mixed-mode conditions. In order to better estimate the remaining fatigue life, the fatigue crack growth behaviour under these conditions needs to be studied. In this paper, an experimental study where mixed-mode I and II overloads are applied to a fatigue crack propagating under mixed-mode I and II constant amplitude loading, is presented. The overloads are found to cause fatigue cr...
5 CitationsSource
#1Kristen Rege (University of Stavanger)H-Index: 5
#2Dimitrios G. Pavlou (University of Stavanger)H-Index: 9
As offshore structures are reaching their original design life, effective repair and life-extension techniques are required, in order to ensure continued safe operation. A stop hole may be drilled ...
5 CitationsSource
4 CitationsSource
#1Kristen Rege (University of Stavanger)H-Index: 5
AN APPROXIMATE DYNAMIC MODEL describing the undamped radial vibration of thin-walled steel pipes with an overwrap of laminated fibre-reinforced polymer (FRP), due to fluid-hammer conditions, is derived. The derived model is an uncoupled model, in which the elastic properties of the pipe and fluid are used to estimate the properties of the fluid-hammer-induced pressure wave. This pressure wave is used as the exciting load in a dynamic analysis of the pipe wall. The derived governing equation is s...
#1Kristen RegeH-Index: 5
#2Hirpa G. LemuH-Index: 11
Fatigue is one of the main causes of failures in mechanical and structural systems. Offshore installations, in particular, are susceptible to fatigue failure due to their exposure to the combination of wind loads, wave loads and currents. In order to assess the safety of the components of these installations, the expected lifetime of the component needs to be estimated. The fatigue life is the sum of the number of loading cycles required for a fatigue crack to initiate, and the number of cycles ...
7 CitationsSource
#1Kristen RegeH-Index: 5
#2Bjørn H. HjertagerH-Index: 29
Turbulent flow around flexible structures is likely to induce structural vibrations which may eventually lead to fatigue failure. In order to assess the fatigue life of these structures, it is necessary to take the action of the flow on the structure into account, but also the influence of the vibrating structure on the fluid flow. This is achieved by performing fluid-structure interaction (FSI) simulations. In this work, we have investigated the capability of a FSI toolkit for the finite volume...
2 CitationsSource
#1Ove Mikkelsen (University of Stavanger)H-Index: 5
#2Kristen Rege (University of Stavanger)H-Index: 5
Last. Dimitrios G. Pavion (University of Stavanger)H-Index: 1
view all 4 authors...
2 Citations
#1Kristen Rege (University of Stavanger)H-Index: 5
#2Dimitrios G. Pavlou (University of Stavanger)H-Index: 9
Abstract A nonlinear model for fatigue damage accumulation under variable amplitude loading is presented. The known assumption that the isodamage curves are converging at the knee point of the S-N curve of the material, has been adopted. The proposed model does only require one parameter, in addition to the S-N curve of the material, in order to calculate the remaining fatigue life. A single value for the parameter has been found to give satisfying agreement with experimental data for four arbit...
42 CitationsSource