| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
The Temperature Sensitivity of Titanium Dwell Fatigue: In-Situ Characterisation, Crystal Plasticity Modelling and Mechanistic Analysis |
| Author(s) |
Fionn Patrick Dunne, Yu Cao, Yilun Xu, Yang Liu, Zebang Zheng |
| On-Site Speaker (Planned) |
Fionn Patrick Dunne |
| Abstract Scope |
This paper addresses the mechanistic basis of Titanium dwell fatigue and its temperature sensitivity. In-situ characterization, digital image correlation and novel stress evaluation has allowed, for the first time, the measurement of microstructural stress redistribution, or load shedding, and its cyclic evolution, together with its temperature sensitivity, in dwell fatigue. The experimental observations demonstrate that the hold period in dwell fatigue of Ti-6Al-4V alloy generates creep and load shedding and that cycling progressively drives up the stresses on the hard macrozones thus supporting many of the previous hypotheses from modelling. It is also shown that load shedding is temperature dependent, being most damaging at about 120°C, and diminishing away above about 220°C, thereby supporting previous theoretical studies. Crystal plasticity modelling and mechanistic studies are presented to show that the temperature sensitivity of dwell fatigue is controlled by the soft-grain slip strength, creep activation energy and activation volume. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Mechanical Properties, Modeling and Simulation |