Abstract
The mechanical response of metal-ceramic composites is analysed through a homogenization model accounting for the mechanical behaviour of the constituent materials. In order to achieve this purpose a nonlinear homogenization method based on the phase field approach has been suitably implemented into a numerical code. A prescribed homogenized strain state is applied to a unit volume element of a metal-ceramic composite with proportional loading in which all components of the strain tensor are proportional to one scalar parameter. The mechanical response of the material has been modeled by considering a von Mises plasticity model for the metal phase and a Drucker-Prager associative elastic-plastic material model for the ceramic phase. A two stages plasticity has been obtained in which inelastic strain develops in the metal phase followed by a fully plastic response. A comparison with a finite element model of the stress-strain response of an axisymmetric unit cell has been carried out with the purpose to validate the homogenization based modeling presented in the paper. Plastic parameters of a Drucker-Prager yield surface for the homogenized composite have been calculated at different materials compositions. Associative Drucker-Prager plasticity has been found to be accurate for high ceramic content.
Original language | English |
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Pages (from-to) | 483-508 |
Number of pages | 26 |
Journal | International Journal of Plasticity |
Volume | 24 |
Issue number | 3 |
DOIs | |
Publication status | Published - Mar 2008 |
Keywords
- Drucker-prager plasticity
- Metal-ceramic composites
- Non linear homogenization
ASJC Scopus subject areas
- Mechanical Engineering