About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Titanium Technology
|
| Presentation Title |
Understanding the stochastic evolution of microstructural damage in aero-grade Ti-6Al-4V specimens during dwell loading at ambient temperature |
| Author(s) |
Nicholas Armstrong, Jun Wang, Sitarama R. Kada, Pavel Cizek, Ross A. Antoniou, Peter A. Lynch |
| On-Site Speaker (Planned) |
Nicholas Armstrong |
| Abstract Scope |
Dwell fatigue (DF) occurs when an aero-propulsion component experiences sustained elevated stress for a substantial period e.g. during cruising. It results in a significant reduction (≥90%) of the component’s fatigue life. The occurrence of DF in aero-grade titanium alloys introduces considerable uncertainty affecting component design, manufacturing and maintenance.
This presentation reviews the results of in-situ dwell X-ray diffraction (XRD) synchrotron experiments of Ti-6Al-4V specimens. The experiments aimed to understand how microstructural damage (MD) accumulates in the specimens during dwell, prior to fatigue. The XRD data was used to measure the evolution of MD in terms of the density and spatial arrangement of dislocations, while quantifying the activated slip-systems during dwell. The presentation also discusses how MD can be modelled as a stochastic process, which could be incorporated in probabilistic models to predict the occurrence of DF. This understanding ensures ongoing safety and availability of aircraft fleets. |