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Vibration-Based Bending Fatigue of a Hybrid Insert-Plate System

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Abstract

A hybrid bending specimen system was developed to reduce material waste when using the vibration-based fatigue method to gather high cycle fatigue (HCF) data. In the vibration-based fatigue method, a base-excited plate specimen is driven into a high frequency resonant mode until failure. Compared to the axial testing methods, vibration-based failure better represents the conditions and surface-initiated cracks experienced by structural components subject to high frequency vibrations, like blades and vanes in gas turbine engines. In addition, the method produces data over 40 times faster than conventional axial testing methods. Only a small portion of the vibration-based bending specimen is needed to determine crack initiation failure. In order to reduce material waste, a hybrid bending system was designed to test a small specimen held in a reusable carrier plate, thereby reducing material costs to gather HCF data. The final optimized design, the Bruns-Zearley plate specimen, produced fatigue data using 95 % less material. The results are comparable tofatigue data acquired from standard vibration-based plate specimen methods within a 95 % confidence interval.

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Acknowledgments

The authors would like to thank the Air Force Research Laboratories (AFRL), specifically the Turbine Engine Fatigue Facility (TEFF) for their financial support, facility and equipment access, and encouragement of this research.

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    Authors and Affiliations

    1. Universal Technology Corporation, 1270 North Fairfield Road, Dayton, OH, 45433, USA

      Jeffery Bruns & Alyssa Zearley

    2. Air Force Research Laboratory Wright-Patterson AFB, Dayton, OH, 45433, USA

      Tommy George, Onome Scott-Emuakpor & Casey Holycross

    Authors
    1. Jeffery Bruns
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    2. Alyssa Zearley
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    3. Tommy George
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    4. Onome Scott-Emuakpor
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    5. Casey Holycross
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    Corresponding author

    Correspondence to Onome Scott-Emuakpor.

    Additional information

    Jeffery Bruns, Alyssa Zearley contributed equally to the work

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    Bruns, J., Zearley, A., George, T. et al. Vibration-Based Bending Fatigue of a Hybrid Insert-Plate System. Exp Mech 55, 1067–1080 (2015). https://doi.org/10.1007/s11340-015-0004-6

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    • DOI: https://doi.org/10.1007/s11340-015-0004-6

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