Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1573713 | Materials Science and Engineering: A | 2016 | 7 Pages |
Abstract
Plastic deformation of HCP metals involves several deformation modes. The threshold stresses Ïs for the slip and twinning systems, are parameters determined in crystal plasticity models by fitting stress-strain curves. Four deformation paths were selected to activate four different deformation modes and determine the parameters in the VPSC. Experiments and simulations were conducted on a plate with a strong basal texture. It was found that changing the threshold stresses Ïs for basal slip has a limited effect on the predicted flow stress, because the flow stress is strongly dependent on the highest threshold stresses Ïs among the activated deformation modes. The influence of the variation of threshold stresses Ïs on plastic anisotropy was investigated. Only in plane tension anisotropy is strongly dependent on the relative threshold stresses Ïs, so r-value can be used efficiently to determine the material parameters.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Adrien Chapuis, Zhi-qiang Wang, Qing Liu,