Browsing NTNU Open by Author "Mokhtari, Mojtaba"
Now showing items 1-14 of 14
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Buckling and Post-Buckling Behaviour of Extruded Aluminium Panels Subject to the Combined Effects of Welding and Pitting Corrosion
Mokhtari, Mojtaba; Wang, Xintong; Amdahl, Jørgen (Chapter, 2023)The present study investigates the effects of pitting corrosion and welding, both independently and combined, on the buckling and post-buckling behaviour of extruded aluminium panels. For this purpose, a finite element ... -
A Critical Review of Constitutive Models Applied to Ice-Crushing Simulations
Mokhtari, Mojtaba; Leira, Bernt J. (Peer reviewed; Journal article, 2024)In marine engineering, understanding the compressive behaviour of ice is crucial for accurately modelling ice loads on ships and offshore structures in ice-prone waters. Over the past few decades, numerous studies have ... -
Evaluation of Hydrodynamic Sloshing Impact Loads on Structural Integrity of three-tank LNG Carrier Cargo Containment Systems: A Finite Element Approach by Embedded Element Modeling
Rimol, Vilde Bakken; Svenkerud, Mats Wesche (Master thesis, 2024)Flytende naturgass (LNG) er en viktig del i den globale energimiksen, og tilbyr et mer miljøvennlig alternativ til tradisjonelle fossile brensler. Transporten av LNG via LNG-tankskip spiller en avgjørende rolle i å møte ... -
Evaluation of Hydrodynamic Sloshing Impacts Loads on Structural Integrity of three-tank LNG Carrier Cargo Containment systems: A Finite Element Approach By Embedded Modeling
Rimol, Vilde Bakken; Svenkerud, Mats Wesche (Master thesis, 2024)Flytende naturgass (LNG) er en viktig del i den globale energimiksen, og tilbyr et mer miljøvennlig alternativ til tradisjonelle fossile brensler. Transporten av LNG via LNG-tankskip spiller en avgjørende rolle i å møte ... -
Localized corrosion damage prediction of steel plates in marine applications using quadrilateral inverse-shell elements based on iFEM
Ghasemzadeh, Maryam; Mokhtari, Mojtaba; Kefal, Adnan (Chapter, 2022)This research effort focuses on a damage detection strategy for identifying pitting corrosion locations in corroded marine structures using numerical approaches. To this end, a four-node quadrilateral inverse shell element ... -
Material Characterization of Magnetorheological Elastomers for Controllable Connectors in Intelligent Multi-Modular Structures
Danemyr, Linnea (Master thesis, 2024)Den økende globale etterspørselen etter bærekraftige energikilder driver kontinuerlig utviklingen av levedyktige og pålitelige løsninger for å redusere avhengigheten av fossile brensler og bekjempe klimaendringer. Flytende ... -
A non-linear viscoelastic material model with progressive damage based on microstructural evolution and phase transition in polycrystalline ice for design against ice impact
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Peer reviewed; Journal article, 2023)This study presents a nonlinear viscoelastic material model incorporating a progressive damage framework with an iterative algorithm for glacial/freshwater polycrystalline ice subject to compressive impact load induced by ... -
Numerical analysis of pit-to-crack transition under corrosion fatigue using a stochastic pit generation algorithm
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Chapter, 2023)In numerical corrosion fatigue studies, the complex pit morphology is often idealized using an overly simplified geometry with a smooth surface because of the difficulties involved in modelling defects with the irregular ... -
Numerical Simulation of Concurrent Flexural and Crushing Failure of Level Ice
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Chapter, 2024) -
Pitting corrosion identification approach based on inverse finite element method for marine structure applications
Ghasemzadeh, Maryam; Mokhtari, Mojtaba; Bilgin, Mahmut Hudayi; Kefal, Adnan (Peer reviewed; Journal article, 2023)This paper presents a state-of-the art inverse finite element method (iFEM) for full-field, real-time structural health monitoring (SHM) of corroding structures. The study focuses on detecting the location and identifying ... -
Pressure-dependent plasticity models with convex yield loci for explicit ice crushing simulations
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Peer reviewed; Journal article, 2022)Despite the viscous behaviour of crushed ice, plasticity models have been widely used for numerical modelling of ‘design-ice’ in damage assessment applications for several reasons outlined herein. The Crushable Foam (CF) ... -
A rate and pressure dependent elastoplastic material model for glacial ice colliding with marine structures
Mokhtari, Mojtaba; Kim, Ekaterina; Amdahl, Jørgen (Chapter, 2023)An elastoplastic ice material model with a rate and pressure dependent yield criterion is proposed in the present study for ice-structure collision simulations. The yield criterion is based upon the Tsai-Wu failure envelope ... -
Thermal analysis of marine structural steel EH36 subject to non-spreading cryogenic spills. Part I: experimental study
Nam, Woongshik; Mokhtari, Mojtaba; Amdahl, Jørgen (Peer reviewed; Journal article, 2021)Liquefied Natural Gas (LNG) spills may cause steel to embrittle, leading to the brittle fracture of marine structures due to the cryogenic temperatures. For the integrity assessment of marine steel structures in the event ... -
Thermal analysis of marine structural steel EH36 subject to non-spreading cryogenic spills. Part II: finite element analysis
Mokhtari, Mojtaba; Nam, Woongshik; Amdahl, Jørgen (Peer reviewed; Journal article, 2021)In Part I of this paper, six liquid nitrogen (LN2) pool boiling tests were carried out to locally cool down six different EH36 steel plates to cryogenic temperatures. Leindenfrost and Critical Heat Flux (CHF) points of LN2 ...