Blar i ODA Open Digital Archive på forfatter "Tveit, Sigbjørn"
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A continuum approach to multiaxial high-cycle fatigue modeling for ductile metallic materials
Tveit, Sigbjørn; Reyes, Aase; Erduran, Emrah (Results in Engineering (RINENG);, Peer reviewed; Journal article, 2024)In this work we propose a generalization of the endurance function employed in the continuum approach to high-cycle fatigue modeling by Ottosen et al. (2008). The von Mises-type backstress-modified effective stress term ... -
Cost-optimal design of flexural concrete beam reinforced with FRP reinforcements
Tveit, Sigbjørn; Wilhelmsen, Martin; Lundeland, Vlad Aleksander; Kioumarsi, Mahdi (SynerCrete'18: Interdisciplinary Approaches for Cement-based Materials and Structural Concrete: Synergizing Expertise and Bridging Scales of Space and Time.;Vol. 1&2, Chapter; Chapter; Peer reviewed, 2018-10-22)Because of the non-ductile nature of FRP reinforcement, the convention of designing cross-sections with the flexure strength limited by reinforcement yield, as for steel, is not adequate. Although ACI 440.1R-15 gives ... -
Fiber reinforced polymer (FRP) som slakkarmering i momentpåkjente betongkonstruksjoner.
Wilhelmsen, Martin; Lundeland, Vlad Aleksander; Tveit, Sigbjørn (Bachelor thesis, 2018)Denne bacheloroppgaven omhandler bruken av ikke-metallisk slakkarmering i momentpåkjente konstruksjonselementer av betong. Formålet var å danne et bilde av armeringens virkning i betongkonstruksjoner. Oppgaven omhandler ... -
Formability analyses of AA6016-T4 aluminum alloy sheets subjected to roping
Tveit, Sigbjørn; Reyes, Aase (Chapter; Peer reviewed; Conference object; Journal article, 2024)Due to its good formability characteristics, AA6xxx aluminum alloys have become popular as a light-weight alternative to steel for car bodywork components produced by stamping. In the design of forming operations, numerical ... -
Formability analysis of AA6016-T4 aluminium alloy sheets subjected to roping
Tveit, Sigbjørn (MABY;2020, Master thesis, 2020)Due to its good formability characteristics, AA6xxx aluminium alloys have become popular as a light-weight alternative to steel for components produced by stamping operations for use in the bodywork of cars. In this thesis, ... -
Formability of AA5083-H111 aluminum sheets for use in floating photovoltaic structures
Jibrail, Jon (Master thesis, 2023)This investigation focuses on formability aspects of aluminum alloy AA5083-H111 to improve the forming process for floating photovoltaic structures. The study targets the identification of limiting variables and efficiency ... -
Forming effects on high-cycle fatigue in an aluminum sheet structure using the Ottosen-Stenström-Ristinmaa model
Tveit, Sigbjørn; Reyes, Aase; Erduran, Emrah (Chapter, 2022) -
Parametric failure limit detection for the sheet metal forming of a floating photovoltaic (FPV) aluminum alloy structure
Tveit, Sigbjørn; Reyes, Aase; Erduran, Emrah (Chapter; Peer reviewed; Conference object; Journal article, 2024)The sheet metal forming process of a floating photovoltaic (FPV) structure is simulated in LS-DYNA. An anisotropic yield criterion and a two-term Voce hardening law are used to model the plastic behavior of AA5083-H111 ... -
A submodeling technique for incorporating sheet metal forming effects in an AA5083 FPV structure
Tveit, Sigbjørn; Reyes, Aase (Structures;, Peer reviewed; Journal article, 2024)While the first generation of floating photovoltaics (FPV) was designed for operation in freshwater reservoirs, the technology is currently expanding to marine territories. In this paper, an FPV structure made from formed ...