| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Concurrent Modeling of Martensitic Transformation and Crack Growth in Shape Memory Ceramics |
| Author(s) |
Ehsan Moshkelgosha, Mahmood Mamivand |
| On-Site Speaker (Planned) |
Ehsan Moshkelgosha |
| Abstract Scope |
The dynamic interaction of martensitic transformation (MT) and crack growth in Shape Memory Materials (SMMs) is a less studied subject which broadly limited our fundamental understanding of the mechanisms behind mechanical degradation in SMMs. In this work, we developed a novel multiphysics model which coupled the Ginzburg-Landau equations of MT to variational formulation of brittle crack growth based on Griffith theory. The model is parameterized for single and polycrystalline zirconia which experience tetragonal to monoclinic phase transformation. The model’s predictions of anomaly crack growth path are in good agreement with the experiments. The model also reveals the critical role of crystal lattice orientation on transformation toughening and crack growth path. For instance in a constrained grain the maximum (minimum) toughening happens when a-axis of tetragonal phase makes the angle of 55 (90) degrees with the crack surface. The effect of grain size on the fracture toughness will also be discussed. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |