|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Which Aggregate Complexity is Required in Full-field Polycrystalline Computations Depending on the Scale of Interest?
||Maxime Sauzay, J. Liu, Loic Signor, Th. Ghidossi, Patrick Villechaise, F. Rachdi
|On-Site Speaker (Planned)
Crystalline finite element computations are carried out on large 316L(N) aggregates. Various shapes of grains are used: cube, Voronoļ polyedron or even more realistic grain shapes. Finally, a 3D mesh containing 1370 surface and bulk grains is built based on 40 repeated sequences including EBSD measurement and repolishing. This most realistic 3D aggregate contains a large number of twins and its distribution of grain sizes is very broad.
The considered grain shape and size distributions affect only weakly the predicted macroscopic behaviour. More surprisingly, the mean grain distributions differ only slightly whatever the aggregate complexity. Only close to GBs may some differences be observed.
The distributions of the mean grain plastic strain become narrower with increasing remote plastic strain, in agreement with TEM observations of dislocation microstructures. On the contrary, the mean grain axial stress distributions become more scattered with plastic strain increasing, in agreement with X-ray diffraction measurements.
||Planned: EPD Congress Volume