Journal Published Online: 09 July 2020
Volume 49, Issue 1

Damage Accumulation in a Novel High-Throughput Technique to Characterize High Cycle Fatigue

CODEN: JTEVAB

Abstract

A multiple-insert carrier plate assembly has been developed to increase the throughput of vibration-based fatigue testing. Typically, in vibration-based fatigue testing, a cantilevered rectangular plate is excited in a high-frequency resonant mode until failure. In this manner, an S-N curve for bending fatigue can be constructed. The concept behind vibration-based fatigue testing has been improved by employing a U-shaped carrier plate and fastening multiple smaller specimens into the channel of the carrier plate, such that fatigue tests can be conducted in tandem. However, because of the presence of a variable stress field over the surface of the assembly, the strain in the specimens is unequal. To account for this unequal strain distribution, a framework is provided for estimating how damage accumulates within each specimen. Using this framework, the efficiency gained by adopting a multi-insert approach is evaluated. By optimizing the strategy with which specimens are replaced as they fail, a throughput 5.49 times greater than sequential testing is shown to be feasible.

Author Information

Berke, Ryan B.
Mechanical and Aerospace Engineering, Utah State University, Logan, UT, USA
Furman, Brandon A.
Mechanical and Aerospace Engineering, Utah State University, Logan, UT, USA
Holycross, Casey
Air Force Research Laboratory, Aerospace Systems Directorate, Dayton, OH, USA
Scott-Emuakpor, Onome
Air Force Research Laboratory, Aerospace Systems Directorate, Dayton, OH, USA
Pages: 16
Price: $25.00
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Details
Stock #: JTE20190593
ISSN: 0090-3973
DOI: 10.1520/JTE20190593