| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Fatigue Crack Growth in a Ni-rich NiTiHf High Temperature Shape Memory Alloy under Thermomechanical Loading |
| Author(s) |
Behrouz Haghgouyan, Benjamin Young, Ibrahim Karaman, Dimitris C Lagoudas |
| On-Site Speaker (Planned) |
Behrouz Haghgouyan |
| Abstract Scope |
A unified methodology is proposed for crack growth in shape memory alloys (SMAs) under two loading paths: mechanical, i.e. loading under constant temperature, and actuation, i.e. thermal cycling under constant load. The methodology is applied to understand the mechanisms contributing to crack growth in the presence of thermal and mechanical induced phase transformation in a Ni-rich NiTiHf high-temperature SMA. In mechanical crack growth, the material undergoes forward transformation upon loading and reverse transformation upon unloading. In actuation crack growth, the material is subjected to thermal cycling under constant load resulting in forward transformation upon cooling and reverse transformation upon heating. The resistance of the material to crack growth under both loading paths is characterized by measuring the crack growth rates corresponding to the range of the applied driving force. The results are expected to provide key insights into the underlying mechanisms that promote crack growth in SMAs. |
| Proceedings Inclusion? |
Planned: |