A calibration of Gurson-Tvergaard- Needleman micromechanical model of ductile fracture

0421044 - ÚFM 2014 RIV CZ eng K - Conference Paper (Czech conference)
Stratil, Luděk - Hadraba, Hynek - Šiška, Filip - Dlouhý, Ivo
A calibration of Gurson-Tvergaard- Needleman micromechanical model of ductile fracture.
19th Interational Conference Engineering mechanics 2013. Praha: Institute of Thermomechanics AS CR, v. v. i, 2013, s. 560-566. ISBN 978-80-87012-47-5.
[Engineering mechanics 2013. Svratka (CZ), 13.05.2013-16.05.2013]
R&D Projects: GA MŠMT(CZ) EE2.3.20.0197
Institutional support: RVO:68081723
Keywords : ductile fracture * GTN model * void nucleation * MLR model * Eurofer97
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Fracture mechanics characteristics of ductile fracture often depend on geometry and size of specimens. A micromechanical modelling of material damage proposes a tool for treatment of geometry and size effects in fracture mechanics. Application of micromechanical model for certain materiál requires a calibration of model‘s parameters. This contribution presents the calibration procedure of Gurson-Tvergaard-Needleman model of ductile fracture for Eurofer97 steel. The identification of ductile damage of the steel and its tensile properties at various level of stress triaxiality by testing smooth and notched bars were determined in the previous study. The calibration procedure was performed by hybrid method as a combination of FEA simulations of tensile tests and fractography analyses. The Gurson-Tvergaard-Needleman model performance is greatly influenced by true stress-true strain curve of the material.
Permanent Link: http://hdl.handle.net/11104/0228248