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

Philip Oppermann, Ralf Denzer, Andreas Menzel

Research output: Contribution to conferenceAbstractpeer-review

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 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.
Original languageEnglish
Pages186
Number of pages1
Publication statusPublished - 2018 Mar
EventGAMM Annual Meeting, 2018 - Technische Universität München, Munich, Germany
Duration: 2018 Mar 192018 Mar 23
Conference number: 89
http://jahrestagung.gamm-ev.de/

Conference

ConferenceGAMM Annual Meeting, 2018
Country/TerritoryGermany
CityMunich
Period2018/03/192018/03/23
Internet address

Subject classification (UKÄ)

  • Metallurgy and Metallic Materials
  • Applied Mechanics

Free keywords

  • Thermoplasticity
  • Viscoplasticity
  • finite element implementation of coupled problems
  • Thermomechanical

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