Publication detail

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

STRATIL, L. HADRABA, H. ŠIŠKA, F. DLOUHÝ, I.

Original Title

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

Type

conference paper

Language

English

Original Abstract

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 material requires a calibration of model 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. It was verified that derivation of true stress-true strain curve of the material by using of multiple linear regression model proposed by Mirone is very suitable.

Keywords

ductile fracture, GTN model, void nucleation, MLR model, Eurofer97

Authors

STRATIL, L.; HADRABA, H.; ŠIŠKA, F.; DLOUHÝ, I.

RIV year

2013

Released

13. 5. 2013

Publisher

Institute of Thermomechanics AS CR, v. v. i.

Location

Praha

ISBN

978-80-87012-47-5

Book

Engineering mechanics 2013

Pages from

560

Pages to

566

Pages count

7

BibTex

@inproceedings{BUT101132,
  author="Luděk {Stratil} and Hynek {Hadraba} and Filip {Šiška} and Ivo {Dlouhý}",
  title="A calibration of Gurson-Tvergaard-Needleman micromechanical model of ductile fracture",
  booktitle="Engineering mechanics 2013",
  year="2013",
  pages="560--566",
  publisher="Institute of Thermomechanics AS CR, v. v. i.",
  address="Praha",
  isbn="978-80-87012-47-5"
}