About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Response of Materials Investigated Through Novel In-Situ Experiments and Modeling
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Presentation Title |
Growing Voids and Migrating Twins |
Author(s) |
Shailendra P. Joshi |
On-Site Speaker (Planned) |
Shailendra P. Joshi |
Abstract Scope |
Ductile failure is a multi-scale phenomenon. In metals, atomic deformation mechanisms interact with micromechanical defects such as voids. Inter-void interactions lead to mesoscopic damage zones. Finally, the interaction of damage zones with component scale causes a macroscopic fracture. Coupling between these scales is complicated by the anisotropic nature of plasticity.
We present the deformation stability and failure of nanotwinned materials whose grain-scale anisotropy is brought about by size effects associated with fine-scale growth twins. Using a length-scale dependent crystal plasticity finite element framework, we investigate the role of twin boundary mediated microstructural evolution in the damage due to nano-void evolution. The interaction between the rates of twin boundary migration and void growth is discussed from the vantage point of macroscopic deformation stability. While the investigation pertains to nanotwinned materials, the observations and analysis may be relevant to analogous situations in multi-layered materials with moving interfaces. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Mechanical Properties, Nanotechnology |