Damage evolution in elasto-plastic materials - Material response due to different concepts
Author
Summary, in English
The purpose of this paper is to show that shortcomings exist in the plasticity induced damage theories. Existing phenomenological thermodynamic approaches used for describing elasto-plasticity coupled with damage are therefore evaluated. Within the concept of effective stress both the postulate of strain equivalence and the postulate of (complementary) energy equivalence, as well as extensions of the postulates, are considered. As a prototype model the von Mises plasticity model coupled with isotropic damage is considered. Simulations of a strain-controlled uniaxial model are also performed. The results reveal that a mapping, similar to that of the stress, of both the kinematic and isotropic hardening variables is to be preferred. More interesting is that, irrespective of the postulate employed, the elastic strain will not equal zero when failure takes place, i.e. the interpretation of elastic strain is lost. From the results it is also concluded that (complementary) energy equivalence have some undesirable properties.
Department/s
Publishing year
2003
Language
English
Pages
115-139
Publication/Series
International Journal of Damage Mechanics
Volume
12
Issue
2
Document type
Journal article
Publisher
SAGE Publications
Topic
- Mechanical Engineering
Keywords
- strain equivalence
- clasto-plasticity
- plasticity induced damage
- isotropic damage
- damage evolution
- thermodynamics
- energy equivalence
Status
Published
ISBN/ISSN/Other
- ISSN: 1056-7895