The Gurson-Tvergaard-Needleman model calibration from sub-size test specimens by size corresponding to the half of Charpy specimen

0435307 - ÚFM 2015 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Stratil, Luděk - Šiška, Filip - Hadraba, Hynek - Dlouhý, Ivo
The Gurson-Tvergaard-Needleman model calibration from sub-size test specimens by size corresponding to the half of Charpy specimen.
Determination of mechanical properties of materials by small punch and other miniature testing techniques. Ostrava: Ocelot s.r.o, 2014 - (Matocha, K.; Hurst, R.; Sun, W.), s. 368-381. ISBN 978-80-260-6722-1.
[SSTT 2014 - International Conference Determination of Mechanical Properties of Materials by Small Punch and Other Miniature Testing Techniques /3./. Seggau (AT), 23.09.2014-25.09.2014]
Grant CEP: GA MŠMT(CZ) ED1.1.00/02.0068; GA MŠMT EE2.3.20.0197
Institucionální podpora: RVO:68081723
Klíčová slova: GTN model * miniaturized specimens * fractography analysis * ductile damage
Kód oboru RIV: JL - Únava materiálu a lomová mechanika

The paper deals with a utilization of miniaturized tensile specimens for purposes of local approach application from limited amount of test material. The motivation for application of those miniaturized specimens is the utilization of volume of test material corresponding to the half of Charpy specimen. The tensile testing of miniaturized specimens was conducted at room temperature in ductile regime of the Eurofer97 steel followed by detailed fractography and quantitative analysis of micromechanism of damage. The parameters of Gurson-Tvergaard-Needleman micromechanical model of ductile fracture were calibrated. Except for the slight differences in strength and deformation characteristics no other differences between two sizes of tensile specimens were found. The calibrated sets of parameters of GTN model using the same element size were very similar. The application of different calibrated sets of GTN model parameters for simulation of damage in cracked specimen (R-curve) is sensitive to the element size and needs its calibration.
Trvalý link: http://hdl.handle.net/11104/0239397