About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Fatigue and Inclusions in NiTi Shape Memory Alloy: High-magnification Observations of Damage and Crack Formation at Particle/Void Assemblies |
Author(s) |
Nathan Rendon, William LePage |
On-Site Speaker (Planned) |
Nathan Rendon |
Abstract Scope |
The high-cycle fatigue life of NiTi shape memory alloys is limited by nonmetallic inclusions and surrounding voids ("particle/void assemblies," or PVAs). PVAs are the primary sites for crack initiation, increasing the risk of premature/unpredicted failure in key NiTi applications (stents, heart-valve cages, etc.). Unfortunately, the micromechanical understanding of PVAs in NiTi is limited, largely due to their small size (~3 µm). To provide more confident fatigue predictions, this work is zooming in on PVAs and their role in NiTi fatigue, especially with scanning electron microscope digital image correlation (SEM-DIC) to quantify strain around PVAs prior to and after crack initiation. This talk will share our results so far, including details of reliable SEM-DIC speckle patterning for NiTi, along with the initiation and development of damage around inclusions and voids. Ultimately, our work is pinpointing the characteristics of PVAs that most likely lead to failure. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Phase Transformations, Machine Learning |