|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||A Microstructure-Sensitive Fatigue Crack Growth Study Based on Experimental Measurements and Computational Modeling in Al-Si Cast Alloys
||Tiantian Zhang, Anthony Spangenberger, Diana Lados
|On-Site Speaker (Planned)
Fatigue crack growth (FCG) plays an important role in material/structural design and component lifing. Robust FCG models necessitate microstructure-sensitive experimental studies of the damage near the crack tip. In this regard, plasticity ahead of crack tip in hypoeutectic Al-Si cast alloys was captured using in-situ and ex-situ DIC, and its interactions with the microstructure were studied. The strain field was found to correlate with both location relative to the crack path and alloy’s characteristic microstructural features. The DIC allowed establishing relationships between crack tip plasticity, microstructure, and FCG rate, while measuring crack tip opening displacement at various growth rates. Compliance and a non-destructive evaluation method based on eddy-current detection were used to monitor FCG at all growth stages. Microstructural characterization was performed using optical microscopy and electron backscatter diffraction (EBSD). The experimental determinations were successfully used to validate a computational model developed to predict FCG in cast Al alloys.
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