About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Mitigating Localized Plastic Strain Accumulation in Cyclic Loading of Shape Memory Ceramics: A Phase-field Modeling Study |
Author(s) |
Amirreza Lotfolahpour , Mohsen Asle Zaeem |
On-Site Speaker (Planned) |
Mohsen Asle Zaeem |
Abstract Scope |
Plastic strain accumulation rate directly affects the fatigue life of polycrystalline materials and can be used as a fatigue indicator parameter to evaluate the number of loading cycles before a fatigue crack initiated. In this study, a phase-field phase-transformation model is coupled with a viscoplastic model to investigate the effects of microstructural features, such as grain boundaries (GBs), grain size, grain orientation, sample size and engineered defects on the plastic strain localization and accumulation in polycrystalline shape memory ceramics. The results indicate that by reducing the GB density, the plastic strain accumulation decreases noticeably. In addition, engineered pores can mitigate the plastic strain accumulation noticeably if they are located close to the GBs. The plastic strain accumulation can be drastically decreased in the textured microstructures. A cross-correlation approach is applied to depict the relationship between the microstructural features and plastic strain accumulation as well as the martensitic phase transformation fraction. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, Phase Transformations |