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Modeling of plasticity at large strains

Wallin, Mathias LU (2003)
Abstract
This thesis is concerned with various aspects of the constitutive modeling of plasticity. Both theoretical issues and issues related to the numerical implementation of the constitutive models are addressed.



An approach to the modeling of kinematic hardening plasticity when large strains are present, taking the microstructure into account, is developed. Kinematic hardening is modeled using a variable with a structure similar to the deformation gradient. Models are derived within this framework and are implemented in a finite element environment. Different aspects of the kinematic hardening model are examined in detail, both analytically and numerically. An extension of the kinematic hardening

model taking account... (More)
This thesis is concerned with various aspects of the constitutive modeling of plasticity. Both theoretical issues and issues related to the numerical implementation of the constitutive models are addressed.



An approach to the modeling of kinematic hardening plasticity when large strains are present, taking the microstructure into account, is developed. Kinematic hardening is modeled using a variable with a structure similar to the deformation gradient. Models are derived within this framework and are implemented in a finite element environment. Different aspects of the kinematic hardening model are examined in detail, both analytically and numerically. An extension of the kinematic hardening

model taking account of thermal effects is implemented in a coupled finite element code, its heat-generation properties being compared with those of thermo-plastic isotropic hardening model. A constitutive model of porous materials considering both elastic and plastic damage is developed within the thermodynamical framework.





The algorithmic issues concerning the integration of constitutive evolution equations are addressed, an alternative integration algorithm which makes use of standard ODE-tools is proposed. A finite element formulation capable of dealing with nearly incompressible media is derived and is implemented in a finite element program. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Professor Runesson, Kenneth, Chalmers
organization
publishing date
type
Thesis
publication status
published
subject
pages
165 pages
defense location
M:E
defense date
2003-12-12 13:15
ISBN
91-628-5880-7
language
English
LU publication?
yes
id
bdb59bfa-6a96-4738-bfa1-6e460629cdb4 (old id 838657)
date added to LUP
2008-01-10 15:40:39
date last changed
2016-09-19 08:45:18
@misc{bdb59bfa-6a96-4738-bfa1-6e460629cdb4,
  abstract     = {This thesis is concerned with various aspects of the constitutive modeling of plasticity. Both theoretical issues and issues related to the numerical implementation of the constitutive models are addressed.<br/><br>
<br/><br>
An approach to the modeling of kinematic hardening plasticity when large strains are present, taking the microstructure into account, is developed. Kinematic hardening is modeled using a variable with a structure similar to the deformation gradient. Models are derived within this framework and are implemented in a finite element environment. Different aspects of the kinematic hardening model are examined in detail, both analytically and numerically. An extension of the kinematic hardening<br/><br>
model taking account of thermal effects is implemented in a coupled finite element code, its heat-generation properties being compared with those of thermo-plastic isotropic hardening model. A constitutive model of porous materials considering both elastic and plastic damage is developed within the thermodynamical framework.<br/><br>
<br/><br>
<br/><br>
The algorithmic issues concerning the integration of constitutive evolution equations are addressed, an alternative integration algorithm which makes use of standard ODE-tools is proposed. A finite element formulation capable of dealing with nearly incompressible media is derived and is implemented in a finite element program.},
  author       = {Wallin, Mathias},
  isbn         = {91-628-5880-7},
  language     = {eng},
  pages        = {165},
  title        = {Modeling of plasticity at large strains},
  year         = {2003},
}