| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XIX
|
| Presentation Title |
A Cavity-based Micromechanical Model for the Shear Band Failure in Metallic Glasses under Arbitrary Stress State |
| Author(s) |
Yanfei Gao |
| On-Site Speaker (Planned) |
Yanfei Gao |
| Abstract Scope |
A mechanistic model for the failure analysis in metallic glasses requires the knowledge of the entire deformation and damage evolution processes, in contrast to the overly simplified critical free volume or strain model. Motivated by the intergranular cavity-controlled fracture in polycrystals, here we propose that metallic glass failure is governed by the cavity growth inside the shear band under the concomitant processes of diffusive process inside and creep deformation outside the shear band. The competition between diffusion and creep leads to a length scale. When the hydrostatic stress is large, the cavity growth is found to be dominated by diffusional processes, and the above-mentioned length scale becomes the Stokes-Einstein type. When the stress state is predominantly shear, small deformation analysis will not exhibit cavity growth; it is the large shear distortion and cavity coalescence that gives the final failure. A failure map is constructed with respect to arbitrary stress states. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Modeling and Simulation, |