|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Finite Elements Simulation and Statistical Analysis of Elastic Stress Field at Surface of Ti6Al4V Polycrystals in the Presence of Textured Regions
||Loic Signor, Van Truong Dang, Patrick Villechaise, Samuel Hemery
|On-Site Speaker (Planned)
Fatigue crack formation in metallic alloys is generally related to microplasticity which develops only in few grains in the high-cycle regime. The onset of plastic slip arises from elastic interactions between one considered grain and its neighbors. However, the local crystallographic conditions which favor slip activity and subsequent crack initiation are still not fully identified. In Ti6Al4V, it has been shown that fatigue crack formation occurs more favorably along basal crystallographic plane in locally textured regions referred to as macrozones. Finite elements simulations of multiple realizations of polycrystalline aggregates were carried out to evaluate statistically the distribution of elastic stresses in surface grains, as well as derived fields resolved on slip systems. The influence of local texture was thoroughly studied. The results are discussed regarding experimental characterization of the activation of slip in Ti6Al4V observed in-situ in a SEM during monotonic tensile test.
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