Modeling of the degradation of elastic properties due to the evolution of ductile damage
Author
Summary, in English
An elasto-plastic constitutive model for porous materials is formulated within the thermodynamic framework. The formulation facilitates a natural modeling of damage as well as growth and the shrinkage of voids. Metal plasticity is used for demonstrating the possibilities of the formulation. The yield function employed is assumed to depend upon the void-volume fraction, whereas the free energy is dependent on a scalar damage field. To show the capabilities of the model the algorithmic constitutive equations are derived and implemented into a finite element program. It is shown that an extremely simple system involving only two scalar equations needs to be solved in the constitutive driver. Two numerical examples are considered: the necking of an axi-symmetric bar and localization in a notched specimen.
Department/s
Publishing year
2008
Language
English
Pages
149-172
Publication/Series
International Journal of Damage Mechanics
Volume
17
Document type
Journal article
Publisher
SAGE Publications
Topic
- Mechanical Engineering
Status
Published
ISBN/ISSN/Other
- ISSN: 1056-7895