Modeling of plasticity at large strains
Författare
Summary, in English
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.
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.
Avdelning/ar
Publiceringsår
2003
Språk
Engelska
Dokumenttyp
Doktorsavhandling
Ämne
- Mechanical Engineering
Status
Published
Handledare
ISBN/ISSN/Övrigt
- ISBN: 91-628-5880-7
Försvarsdatum
12 december 2003
Försvarstid
13:15
Försvarsplats
M:E
Opponent
- Kenneth Runesson (Professor)