Generalized Continuum Modelling of Grain Size Effects in Polycrystals
Event details
| Date | 15.05.2012 |
| Hour | 13:15 › 14:15 |
| Speaker | Prof. Samuel Forest, Ecole des Mines, Paris |
| Location | |
| Category | Conferences - Seminars |
The effect of the dislocation density tensor is introduced into the classical crystal plasticity framework by means of the micromorphic theory of single crystals. A computational homogenization strategy is presented in order to describe the global and local responses of two--dimensional polycrystalline aggregates for grain sizes ranging from 1 to 200 microns. The model is shown to naturally predict a size--dependent kinematic hardening behavior which is responsible for the observed strong size effects. The yield stress at a given averaged plastic strain is shown to follow a power law scaling relation for grain sizes larger than a critical one. The field of plastic deformation is also strongly affected by grain size, whereby micron--size grains lead to the formation of intense slip bands crossing several grains.
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- IGM