|About this Abstract
||Materials Science & Technology 2011
||Fatigue and Microstructure: A Symposium on Recent Advances
||Investigation of Very High Cycle Fatigue Behavior Using Micro-Scale Digital Image Correlation
||Jason Geathers, Martina Zimmermann, Samantha Daly, J. Wayne Jones
|On-Site Speaker (Planned)
An experimental investigation into the influence of microstructure on the very high cycle fatigue (VHCF) behavior of polycrystalline metals has been conducted. The study of VHCF is of growing importance because of the recent development of components used in applications that will require increasingly long lifetimes (N<SUB>f</SUB> > 10<SUP>7</SUP>cycles). Mechanisms of damage accumulation and eventual fatigue crack initiation are sensitive to microstructural variations in the VHCF regime, making life prediction in this regime difficult. Furthermore, conventional fatigue test methods make it impractical to interrogate the VHCF regime. A novel experimental capability that combines ultrasonic fatigue technology with stereomicroscopy and Digital Image Correlation (DIC) has been created to enable the quantification of damage accumulation behavior at the microstructural length scale. The evolution of small-scale strain fields developing from microstructure level interactions and its influence on VHCF behavior, and the advantages and disadvantages of this experimental approach will be discussed.
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