|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Novel High-throughput Experiments for Early Damage Evolution in FCC Materials in the High and Very Cycle Fatigue Regime
||Thomas Straub, Michael Buck, Chris Eberl
|On-Site Speaker (Planned)
A material’s fatigue lifetime is determined by the crack formation process: damage accumulation in individual grains, micro crack initiation, short crack formation. While short crack evolution has been under investigation for years, crack initiation is still difficult to observe and characterize. Therefore, the focus of this work lies on the implementation of a novel high-throughput methodology for damage evolution investigation. This can be achieved by sample size reduction and implementation of a sensitive resonant measurement method. HCF tests with fcc materials show a highly reproducible resonant frequency decrease correlating to damage initiation. The subsequent short crack formation can be observed optically or analyzed ex situ in an SEM. This methodology gives in-situ insights of the damage evolution distribution in individual grains and neighbors, depending on the number of cycles, the local stress amplitude, and the grain orientation. This contribution will present fatigue results of pure Ni and potentially pure Cu.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)