|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Investigating Very High Cycle Fatigue Behavior of Ti-6242S Using In-situ Ultrasonic Fatigue in an E-SEM
||Jason Geathers, Christopher J. Torbet, J Wayne Jones, Samantha Daly
|On-Site Speaker (Planned)
The effects of microstructure and environment on fatigue damage accumulation processes in the very high cycle fatigue (VHCF) regime were investigated in a Ti-6242S titanium alloy. Although strains are nominally elastic in VHCF, local cyclic plastic strain accumulation occurs at the micro-scale and drives crack initiation and early growth behavior. An experimental methodology is employed which combines ultrasonic fatigue at 20 kHz, scanning electron microscopy, and Digital Image Correlation (DIC) to examine the evolution of full-field strains at the micro-scale. Crack initiation as a function of microstructural neighborhoods and specific microstructural features was correlated with cyclic strain accumulation as measured by DIC. The influence of environment on short crack growth behavior from focused ion beam machined micro-notches located at critical microstructural sites was also examined. The role of microstructure and environment on strain localization, crack initiation, and short crack growth will be described.
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