On the simulation of thermo-mechanical forming processes

Han Huetink

Research output: ThesisPhD Thesis - Research UT, graduation UTAcademic

36 Downloads (Pure)

Abstract

A formulation for elastic-plastic constitutive equations is given based on principles of continuum thermo-mechanics and thermodynamics. Energy dissipation and phase changes are included in the mathematical model. It is shown that kinematic hardening can be described properly for large deformations, by a two-fractions model. A mixed Eulerian-Lagrangian finite element method has been developed by which nodal point locations may be adapted independently of the material displacement. Numerical problems, due to large distortions of elements, as may occur in the case of an Updated Lagrangian method, can be avoided, movement of (free) surfaces can be taken into account by adapting nodal surface point locations in a way that they remain on the moving surface. Local and weighed global smoothing are introduced in order to avoid numerical instabilities. Applications are shown by simulations of an upsetting process, a wire drawing process and a steel quenching process. The results of the simulation of the upsetting process show satisfactory agreement with the results of an experiment carried out.
Original languageUndefined
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Rijken, A., Supervisor
  • Besseling, J.F., Advisor
Award date20 Jun 1986
Place of PublicationEnschede
Publisher
Publication statusPublished - 20 Jun 1986

Keywords

  • METIS-267669
  • IR-72608

Cite this

Huetink, H. (1986). On the simulation of thermo-mechanical forming processes. Enschede: Universiteit Twente.
Huetink, Han. / On the simulation of thermo-mechanical forming processes. Enschede : Universiteit Twente, 1986. 134 p.
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abstract = "A formulation for elastic-plastic constitutive equations is given based on principles of continuum thermo-mechanics and thermodynamics. Energy dissipation and phase changes are included in the mathematical model. It is shown that kinematic hardening can be described properly for large deformations, by a two-fractions model. A mixed Eulerian-Lagrangian finite element method has been developed by which nodal point locations may be adapted independently of the material displacement. Numerical problems, due to large distortions of elements, as may occur in the case of an Updated Lagrangian method, can be avoided, movement of (free) surfaces can be taken into account by adapting nodal surface point locations in a way that they remain on the moving surface. Local and weighed global smoothing are introduced in order to avoid numerical instabilities. Applications are shown by simulations of an upsetting process, a wire drawing process and a steel quenching process. The results of the simulation of the upsetting process show satisfactory agreement with the results of an experiment carried out.",
keywords = "METIS-267669, IR-72608",
author = "Han Huetink",
year = "1986",
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Huetink, H 1986, 'On the simulation of thermo-mechanical forming processes', University of Twente, Enschede.

On the simulation of thermo-mechanical forming processes. / Huetink, Han.

Enschede : Universiteit Twente, 1986. 134 p.

Research output: ThesisPhD Thesis - Research UT, graduation UTAcademic

TY - THES

T1 - On the simulation of thermo-mechanical forming processes

AU - Huetink, Han

PY - 1986/6/20

Y1 - 1986/6/20

N2 - A formulation for elastic-plastic constitutive equations is given based on principles of continuum thermo-mechanics and thermodynamics. Energy dissipation and phase changes are included in the mathematical model. It is shown that kinematic hardening can be described properly for large deformations, by a two-fractions model. A mixed Eulerian-Lagrangian finite element method has been developed by which nodal point locations may be adapted independently of the material displacement. Numerical problems, due to large distortions of elements, as may occur in the case of an Updated Lagrangian method, can be avoided, movement of (free) surfaces can be taken into account by adapting nodal surface point locations in a way that they remain on the moving surface. Local and weighed global smoothing are introduced in order to avoid numerical instabilities. Applications are shown by simulations of an upsetting process, a wire drawing process and a steel quenching process. The results of the simulation of the upsetting process show satisfactory agreement with the results of an experiment carried out.

AB - A formulation for elastic-plastic constitutive equations is given based on principles of continuum thermo-mechanics and thermodynamics. Energy dissipation and phase changes are included in the mathematical model. It is shown that kinematic hardening can be described properly for large deformations, by a two-fractions model. A mixed Eulerian-Lagrangian finite element method has been developed by which nodal point locations may be adapted independently of the material displacement. Numerical problems, due to large distortions of elements, as may occur in the case of an Updated Lagrangian method, can be avoided, movement of (free) surfaces can be taken into account by adapting nodal surface point locations in a way that they remain on the moving surface. Local and weighed global smoothing are introduced in order to avoid numerical instabilities. Applications are shown by simulations of an upsetting process, a wire drawing process and a steel quenching process. The results of the simulation of the upsetting process show satisfactory agreement with the results of an experiment carried out.

KW - METIS-267669

KW - IR-72608

M3 - PhD Thesis - Research UT, graduation UT

PB - Universiteit Twente

CY - Enschede

ER -

Huetink H. On the simulation of thermo-mechanical forming processes. Enschede: Universiteit Twente, 1986. 134 p.