|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||Quantification of Twinning for Sub-Grid Mesoscale Modeling
||Veronica Livescu, Curt A. Bronkhorst, Irene J. Beyerlein, Hashem M. Mourad, Manuel L. Lovato, Olivia F. Dippo
|On-Site Speaker (Planned)
The physical process of twinning is not as well understood as dislocation slip mediated plasticity. Deformation twinning induces changes to material structure by locally changing material configuration and forming internal boundaries within the grain, and therefore affects material behavior and damage response. Work presented here is aimed at helping the development of a ‘sub-grid’ model, representing the laminate morphology of twinning at the single crystal mesoscale for continuum finite element codes.
Twinning behavior of high-purity titanium is studied through a series of interrupted dynamic compression experiments where samples are deformed to successive levels of strain at the same dynamic strain-rate. Pre-test microstructure statistics, post-mortem twin statistics, as well as connections of twinning behavior with microstructure and texture are also presented. Statistics on twin density, morphology, and texture are used to guide the twin nucleation model development. For validation purposes, post-mortem twin morphology is compared to continuum simulations of experimental conditions.
||Planned: EPD Congress Volume