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Modelling Thermo-Viscoplasticity of Case-Hardening Steels Over Wide Temperature Ranges

Oppermann, Philip LU ; Denzer, Ralf LU and Menzel, Andreas LU (2018) GAMM Annual Meeting, 2018 p.186-186
Abstract
The aim of this work is the development of a thermodynamically consistent fully coupled thermoviscoplastic material model for metals, especially for case hardening steels.
The model is based on a split of the free energy into a thermo-elastic, a purely plastic and a purely thermal part and covers nonlinear cold-work hardening and thermal softening.
Effects arising from phase transformations at austenitisation temperature are accounted for in the model as well as nonlinear temperature dependencies of the elastic moduli, the plastic hardening moduli, the thermal expansion, the heat capacity and the heat conductivity.
Moreover, strain rate dependency of the current yield stress is realized using a temperature dependent nonlinear... (More)
The aim of this work is the development of a thermodynamically consistent fully coupled thermoviscoplastic material model for metals, especially for case hardening steels.
The model is based on a split of the free energy into a thermo-elastic, a purely plastic and a purely thermal part and covers nonlinear cold-work hardening and thermal softening.
Effects arising from phase transformations at austenitisation temperature are accounted for in the model as well as nonlinear temperature dependencies of the elastic moduli, the plastic hardening moduli, the thermal expansion, the heat capacity and the heat conductivity.
Moreover, strain rate dependency of the current yield stress is realized using a temperature dependent nonlinear Perzyna-type viscoplastic model. The model and its parameters are fitted against experimental data for case hardening steel 16MnCr5 (1.7131). Several numerical examples are discussed. (Less)
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author
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
Thermoplasticity, Viscoplasticity, finite element implementation of coupled problems, Thermomechanical
pages
1 pages
conference name
GAMM Annual Meeting, 2018
conference location
Munich, Germany
conference dates
2018-03-19 - 2018-03-23
language
English
LU publication?
yes
id
8440f79b-6c9a-4124-9588-421b25615d04
alternative location
http://jahrestagung.gamm-ev.de/images/2018/book_of_abstracts.pdf
date added to LUP
2018-03-27 11:43:18
date last changed
2018-11-21 21:38:56
@misc{8440f79b-6c9a-4124-9588-421b25615d04,
  abstract     = {The aim of this work is the development of a thermodynamically consistent fully coupled thermoviscoplastic material model for metals, especially for case hardening steels.<br/>The model is based on a split of the free energy into a thermo-elastic, a purely plastic and a purely thermal part and covers nonlinear cold-work hardening and thermal softening.<br/>Effects arising from phase transformations at austenitisation temperature are accounted for in the model as well as nonlinear temperature dependencies of the elastic moduli, the plastic hardening moduli, the thermal expansion, the heat capacity and the heat conductivity.<br/>Moreover, strain rate dependency of the current yield stress is realized using a temperature dependent nonlinear Perzyna-type viscoplastic model. The model and its parameters are fitted against experimental data for case hardening steel 16MnCr5 (1.7131). Several numerical examples are discussed.},
  author       = {Oppermann, Philip and Denzer, Ralf and Menzel, Andreas},
  keyword      = {Thermoplasticity,Viscoplasticity,finite element implementation of coupled problems,Thermomechanical},
  language     = {eng},
  location     = {Munich, Germany},
  pages        = {186--186},
  title        = {Modelling Thermo-Viscoplasticity of Case-Hardening Steels Over Wide Temperature Ranges},
  year         = {2018},
}