Browsing NTNU Open by Author "Bergo, Sondre"
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Ductile-Brittle Transition in Offshore Steel
Hellum, Gry Myrmo (Master thesis, 2017)The main objective of this thesis was to investigate experimentally and numerically the main effects and interaction effects of temperature, strain rate and stress triaxiality on an offshore X65 steel. During preliminary ... -
Micromechanical Modelling and Simulation of Ductile Fracture in Metallic Materials
Bergo, Sondre (Master thesis, 2016)This thesis is concerned with the modeling of a cellular automaton model of ductile fracture in metals involving significant micro-structure heterogeneities, based on the growth equations of Rice\&Tracey for the microvoids ... -
Micromechanical modelling of ductile fracture in pipeline steel using a bifurcation-enriched porous plasticity model
Bergo, Sondre; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Peer reviewed; Journal article, 2021)In this paper, we investigate the possibility of predicting ductile fracture of pipeline steel by using the Gurson–Tvergaard–Needleman (GTN) model where the onset of void coalescence is determined based on in situ bifurcation ... -
Micromechanical modelling of fracture in ductile alloys with applications to high-strength steel
Bergo, Sondre (Doctoral theses at NTNU;2020:313, Doctoral thesis, 2020) -
Micromechanics-based identification of a ductile fracture model for three structural steels
Bergo, Sondre; Morin, David; Børvik, Tore; Hopperstad, Odd Sture (Journal article, 2020)From an engineering point of view, it is beneficial to reduce the number of mechanical tests required to calibrate the plasticity and fracture models of a structural material. In this study, the ductile fracture model for ... -
Numerical implementation of a non-local GTN model for explicit FE simulation of ductile damage and fracture
Bergo, Sondre; Morin, David; Hopperstad, Odd Sture (Journal article, 2021)In this study, we follow the work of Tvergaard and Needleman (1995, 1997) and Needleman and Tvergaard (1998) and present the numerical implementation and initial applications of a non-local Gurson-Tvergaard-Needleman (GTN) ... -
Simulation of Ductile Crack Propagation in Steel Pipes
Sterner, Elise; Skarstein, Mari (Master thesis, 2018)For the transport of gases and liquids, such as CO2, in steel pipelines to be safe, rupture in the pipe should be avoided. A crack in a pressurized pipe may start to propagate rapidly along the pipeline and run for ...