Modelling of ductile fracture for sub-sized three-point-bend geometry

0385658 - ÚFM 2013 RIV CZ eng C - Conference Paper (international conference)
Stratil, Luděk - Hadraba, Hynek - Kozák, Vladislav - Dlouhý, Ivo
Modelling of ductile fracture for sub-sized three-point-bend geometry.
Engineering Mechanics 2012. Prague: ITAM AS CR, v. v. i., 2012 - (Náprstek, J.; Fischer, C.), s. 1253-1258. ISBN 978-80-86246-40-6.
[Engineering Mechanics 2012 /18./. Svratka (CZ), 14.05.2012-17.05.2012]
R&D Projects: GA ČR GD106/09/H035; GA ČR(CZ) GAP107/10/0361
Institutional support: RVO:68081723
Keywords : complete Gurson model * single specimen approach * Eurofer97 * R-curve
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The contribution deals with the simulation of R-curve using complete Gurson model of ductile fracture. The R-curve was experimentally determined for a Eurofer97 steel on sub-sized three-point-bend geometry in previous study. To apply complete Gurson model the parameters describing the voids´ behaviour and characteristic length parameter need to be determined. The nucleation parameters were identified by single specimen method of smooth tensile test specimen and from metallographic examination of fracture micro-mechanism. The characteristic length parameter was derived by fitting load versus deflection curves of sub-sized specimens. The simulations of the tests were carried out by software ABAQUS in Standard and Explicit modules. The identification was supported by parametric studies. Comparing experimental and simulated R-curve the ductile tearing was not successfully achieved. Insufficient calibrated parameters as a result non-uniqueness problem of single specimen method were found.
Permanent Link: http://hdl.handle.net/11104/0215259