Blar i UiS Brage på forfatter "Mikkelsen, Ove"

Viser treff 1-20 av 27

    • An accurate fatigue damage model for welded joints subjected to variable amplitude loading 

      Aeran, Ashish; Siriwardane, S.A. Sudath C.; Mikkelsen, Ove; Langen, Ivar (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 ...

    • Capacity of Bolted T-stub Connections Between Different Materials Subjected to Tension and Thermal Load 

      Ydstebø, Kristian (Masteroppgave/UIS-TN-IKM/2017;, Master thesis, 2017-06-14)
      The purpose of this thesis is to study the behaviour of bolted T-stub connections of different materials subjected to tension and thermal load. In the Eurocode, NS-EN 1993-1-8 [1], there are given rules and guidelines for ...

    • Crack Arresting using Cutout Repair in Tubular Offshore Joints 

      Attaya, Mostafa (PhD thesis UiS;, Doctoral thesis, 2023)
      Finding efficient repair methods for cracked tubular joints in offshore structures is important, both as a permanent or temporary repair solution. The exploration of such methods and techniques includes the use of hole ...

    • Craco propgation in steel plates using FEM and XFEM 

      Næss, Espen (Master thesis, 2021)
      The pupose of this thesis is to compare stress intensity factor in steel plates using FEM and XFEM. Also to compare methodology in crack propgation with FEM and XFEM. The methods used is finite element method and extended ...

    • Design av ROV tilpasset drift og residens på havbunn 

      Erevik, Gjermund (Bachelor thesis, 2023)
      Oppgavens hensikt var å finne løsninger knyttet til ubemannede undervannsfarkoster som er permanent stasjonært på havbunn – såkalt resident ROV. Det er mange tekniske utfordringer rundt resident ROV - denne oppgaven har ...

    • Experience in Use of 3D Printing in Engineering Education at University of Stavanger 

      Lemu, Hirpa Gelgele; Mikkelsen, Ove (Peer reviewed; Journal article, 2021)
      This article is based on a project run in 2018 and 2019 entitled “Educating Mechanical Engineering using 3D Printing – Under3DP”. The project was funded by Faculty of Science and Technology, University of Stavanger (UiS). ...

    • Experimental and numerical study of the elastic SCF of tubular joints 

      Atteya, Mostafa; Mikkelsen, Ove; Wintle, John; Ersdal, Gerhard (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 assessment of cracked tubular joints repaired with crack-deflecting holes and weld-toe grinding 

      Riise, Simen; Atteya, Mostafa Ahmed; Mikkelsen, Ove; Ersdal, Gerhard (Peer reviewed; Journal article, 2023)
      Tubular joints in offshore structures for energy production are exposed to cyclic loading and may experience fatigue cracking. Presently, the inspection method commonly used for such structures will primarily detect whether ...

    • Fatigue assessment of offshore jacket structures: A case study 

      Kannan, Ramkumar (Masteroppgave/UIS-TN-IMBM/2018;, Master thesis, 2018-06-15)
      Offshore fixed jacket structures are vulnerable to fatigue damage from hazardous environment in North Sea. In this thesis, an offshore jacket structure was checked for the ULS 100- year return period of wave and checked ...

    • Geometric tolerances of tubular T-joint test-specimens 

      Kołos, Krzysztof Jan (Master thesis, 2022)
      The objective of present work is estimation of geometric tolerances of fabricated laboratory test-models from 3D CAD models. A set of 7 welded S355 steel specimens with T-joint design have been investigated. The specimens, ...

    • Konseptutvikling av Sykkelrammer 

      Johansen, Dani (Bachelor thesis, 2022)
      Sammendrag Denne oppgaven handler om konseptutvikling av sykkel rammer, der det ble tatt utgangspunkt i tre ulike konsepter. Hovedsakelig er arbeidet basert på konsept 4.1. Konsept 4.1 er utsatt for størst bøyemoment og ...

    • Local joint flexibility of tubular offshore joints with eccentric brace to chord connections 

      Thorkildsen, Alexander (Masteroppgave/UIS-TN-IMBM/2020;, Master thesis, 2020-06-30)
      Local joint flexibility of tubular offshore joints has been researched to be able to account for correct deflection and redistribution of member forces and moments. This has shown to improve design life prediction for ...

    • Mechanical Testing And Finite Element Analysis Of 3D Printed Continuous Carbon Fiber Reinforced Onyx® Thermoplastic 

      Ghebretinsae, Fithawi (Masteroppgave/UIS-TN-IMBM/2019;, Master thesis, 2019-06)
      While Additive manufacturing (AM) has been limited in prototyping and research areas, this technology has several advantages and significant potential to revolutionize nowadays conventional manufacturing processes. In ...

    • Numerical Stress Analysis of Tubular Joints 

      Santacruz, Alejandro (Master thesis, 2021)

    • Numerical stress analysis of tubular joints 

      Santacruz, Alejandro Polo; Mikkelsen, Ove (Peer reviewed; Journal article, 2021)
      The finite element analysis (FEA) presented in this paper pertains to the stress analysis of both the welded tubular T and X joints and is aimed to assess both the importance of the presence of the weld geometry and the ...

    • Optimizing of Rack and Pinion System for Valve Intervention Tool 

      Le, Minh Jimmy; Kyorra, Patrick (Bachelor thesis, 2023)
      Hensikten med denne oppgaven er å se på forbedringer av rack- og pinion systemet som brukes i Izomax's isolasjonsverktøy Add On Gate Valve (AOGV). Dette systemet blir brukt til å sette inn en blindspade mellom to flenser ...

    • Optimizing of Rack and Pinion System for Valve Intervention Tool 

      Kyorra, Patrick; Le, Minh Jimmy (Bachelor thesis, 2023)
      Hensikten med denne oppgaven er å se på forbedringer av rack- og pinion systemet som brukes i Izomax's isolasjonsverktøy Add On Gate Valve (AOGV). Dette systemet blir brukt til å sette inn en blindspade mellom to flenser ...

    • State-of-the-art of crack propagation modelling in tubular joints 

      Atteya, Mostafa Ahmed; Mikkelsen, Ove; Lemu, Hirpa G. (Peer reviewed; Journal article, 2019)
      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 ...

    • Statistical evaluation of tubular joint SCFs from test data and finite element analyses 

      Ersdal, Gerhard; Atteya, Mostafa Ahmed; Mikkelsen, Ove (Peer reviewed; Journal article, 2023)
      Stress concentration factors (SCF) derived from both FEA and measurements from laboratory experiments are associated with uncertainties. To understand these uncertainties, SCF values can be determined from a series of tests ...

    • Strength analysis of 3D printed carbon fibre reinforced thermoplastic using experimental and numerical methods 

      Ghebretinsae, Fithawi; Mikkelsen, Ove; Akessa, Adugna Deressa (Peer reviewed; Journal article, 2019)
      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 ...