Browsing NTNU Open by Author "Nam, Woongshik"
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Influence of brittle fracture on the crashworthiness of ship and offshore structures in Arctic conditions
Nam, Woongshik; Amdahl, Jørgen; Hopperstad, Odd Sture (Chapter, 2016)Structures operated in Arctic regions are exposed to low temperatures, which may be in the range of the ductile- brittle transition temperature (DBTT) of steel. This implies that the brittleness of the material in such ... -
Modelling of the ductile-brittle fracture transition in steel structures with large shell elements: A numerical study
Nam, Woongshik; Hopperstad, Odd Sture; Amdahl, Jørgen (Journal article; Peer reviewed, 2018)In this paper, the strain energy density (SED) criterion is proposed for predicting the ductile-brittle fracture transition (DBFT) in ships and offshore structures. In finite element simulations, these structures are ... -
Structural resistance of ship and offshore structures exposed to the risk of brittle failure
Nam, Woongshik (Doctoral theses at NTNU;2020:338, Doctoral thesis, 2020)The thesis aims to present the possibility of brittle failure in ship and offshore structures at low temperatures, and propose a material failure criterion for the prediction of ductile-brittle fracture transition in ... -
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 ... -
Thermal analysis of marine structural steel EH36 subject to non-spreading cryogenic spills: Part III: structural response assessment
Nam, Woongshik; Hopperstad, Odd Sture; Amdahl, Jørgen (Peer reviewed; Journal article, 2022)An experimental study that allows for thermal-structural analysis of steel structures subject to non-spreading cryogenic spills is described. A local, non-spreading cryogenic spill was replicated by building a liquid ...