| About this Abstract |
| Meeting |
2017 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XIV
|
| Presentation Title |
Shear Banding of Metallic Glass under Multi-axial Stress States by Shear Transformation Zone Dynamics Simulationszone Dynamics Simulations |
| Author(s) |
Neng Wang, Lin Li |
| On-Site Speaker (Planned) |
Neng Wang |
| Abstract Scope |
The shear banding of metallic glasses under multiaxial stress states is studied using a meso-scale shear transformation zone (STZ) dynamics simulations. The STZ dynamics simulations consider glass deformation as a Markov chain of STZ activation, resulting in mechanical behaviors at large time and length scales. The new implementation incorporates normal stress effect on determining the activation of individual STZs. Consequently, the collective STZ behaviors are directly linked to the asymmetry of the yield stresses and the deviation of shear band fracture from 45o under the uniaxial tension vs. compression. Furthermore, the formation of shear bands from STZ activation subject to nanoindentation is investigated in detail. A yield criterion under multi-axial stress states is proposed and validated using experimental data. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |