| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Dislocation Microstructure Evolution and Plastic Deformation at Crack Tips: A Continuum Dislocation Dynamics Investigation |
| Author(s) |
Khaled N. Sharafeldin, Peng Lin, Ben Anglin, Anter El-Azab |
| On-Site Speaker (Planned) |
Khaled N. Sharafeldin |
| Abstract Scope |
Fracture of ductile materials occurs via complex plasticity mechanisms. Continuum-scale models of fracture capture well the elastoplastic crack behavior including crack blunting ad growth. Crack behavior at the micron and sub-micron scale is not well understood. Continuum dislocation dynamics (CDD) is becoming a viable tool to model plasticity at the mesoscale. The method predicts the density and plastic slip evolution with ~ 50 nm resolution. We apply the CDD approach to investigate the behavior of small-scale cracks under monotonic and cyclic loading. Our results show that crack blunting is highly non-uniform along the crack tip and that it is sensitive to the local dislocation density and slip activity. The results further show that, under cyclic loading, the local tip stresses increase to the limit of decohesion due to hardening and that blunting occurs via accumulation of slip traces at crack tip. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, |