|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||On the Effects of Multiaxial Stress on Facet Nucleation in Cold Dwell Fatigue
||Mitch Cuddihy, Adam Stapleton, Steve Williams, David Rugg, Fionn Dunne
|On-Site Speaker (Planned)
Cold dwell fatigue (CDF) is a critical failure mode observed in α-titanium alloys used in the aerospace industry. This condition arises due to stress holds in fatigue cycles at ambient temperature. CDF is characterized by the presence of basal plane cracks, known as facets. The investigations presented in this talk will address an ongoing effort to combine industrial scale experimentation with fundamental, dislocation level crystal plasticity. The range of multiaxial stress states present in the operating conditions of in-service compressor discs using an elastic analysis (including temperature and residual processing effects) is investigated. This is used to inform the crystal plasticity level analyses which demonstrates the significance of load shedding, through capture of the key rate-sensitivity creep effects, understood to be key in CDF. This approach has facilitated the development of a predictive capability for CDF facet nucleation sites and is validated by extensive disc spin tests.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)