|About this Abstract
||Materials Science & Technology 2012
||Symposium on the Fatigue of Materials II: Advances and Emergences in Understanding
||High Frequency Vibration Based Fatigue Testing for Developmental Alloys
||Casey Holycross, Raghavan Srinivasan, Tommy George, Seshacharyulu Tamirisakandala, Stephan Russ
|On-Site Speaker (Planned)
Many fatigue test methodologies have been previously developed to rapidly evaluate material fatigue behavior. One such method developed by George et al, involves a base-excited plate specimen driven into a high frequency bending resonant mode. This test methodology is limited in that failure is almost always surface initiated, since high stress ranges are localized to regions at or near the specimen surface. This limitation questions its suitability for developmental alloys, which rely on the detection of life limiting subsurface flaws. Should, crack initiation remain sensitive to these subsurface flaws, material design iterations could be completed much faster than with traditional methods. The alloy selected was boron-modified Ti-6Al-4V, an alloy currently being considered for gas turbine engine applications. Plate specimens were subjected to fully reversed, uniaxial bending fatigue. Results are compared with existing data from commercially available Ti-6Al-4V using both vibration based and more traditional fatigue test methods.
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