Detail publikace

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

Originální název

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

Anglický název

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

Jazyk

en

Originální abstrakt

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.

Anglický abstrakt

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.

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",
  annote="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.",
  address="Institute of Thermomechanics AS CR, v. v. i.",
  booktitle="Engineering mechanics 2013",
  chapter="101132",
  howpublished="electronic, physical medium",
  institution="Institute of Thermomechanics AS CR, v. v. i.",
  year="2013",
  month="may",
  pages="560--566",
  publisher="Institute of Thermomechanics AS CR, v. v. i.",
  type="conference paper"
}