| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
In-site Characterisation of Load Shedding in Macrozones during Dwell Fatigue in Ti-64 Alloy |
| Author(s) |
Yu Cao, Yang Liu, Fionn P.E. Dunne |
| On-Site Speaker (Planned) |
Yu Cao |
| Abstract Scope |
Cold dwell fatigue is a key failure mechanism in the titanium alloys which considerably reduces life span. An important factor potentially influencing the susceptibility to dwell fatigue is the duration of the dwell time and its role in load shedding. This study addresses in-situ high-resolution (optical) DIC characterisation of strain and resulting intragranular stress redistribution within macrozones taking place during stress dwell-loading in three-point beam tests. Stresses are estimated from knowledge of measured strains both during the stress hold and at the unloaded state. Hence spatially resolved creep and stress redistribution within Ti-64 hard and soft macrozones have been quantified during dwell showing experimentally for the first time the explicit redistribution of stress onto grains badly orientated for slip. In addition, it has been possible to quantify the time constant associated with the redistribution in this alloy, which is compared with the results of a theoretical approach, facilitating comparison with other important Ti alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Titanium, Sustainability, Characterization |