J. Wayne Jones

Professor Emeritus

jonesjwa@umich.edu

2022 Gerstacker

T: (734) 764-7503

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Rapid Assessment of the Role of Microstructural Variability in the Fatigue Behavior of Structural Alloys Using Ultrasonic Fatigue

Collaborators: Tresa M. Pollock
Sponsor: DARPA
This program addresses the growing need to more rapidly develop sound life prediction and life monitoring methodologies aero engine components, specifically those using nickel base superalloys. The current program expands the investigation of the current AFOSR research at the University of Michigan to include a critical investigation of the capabilities of ultrasonic fatigue techniques in life prediction of nickel base superalloys. The fatigue behavior (stress range, mean stress, temperature vs. cycles to failure) of Rene 88DT is being investigated in the range of 105 to 109 cycles using ultrasonic fatigue instrumentation to develop a statistically significant database of fatigue behavior for carefully chosen test conditions. The capability of this approach for high temperature fatigue crack growth from small notches and similar defects is also being examined.
Highlights (Click an image for more information)
  • Rene 88DT Laser Initiated Crack

    The ultrasonic fatigue behaviors of the polycrystal superalloy Rene' 88 DT in the lifetime regime of 105 to 109 cycles are investigated at 20 C and 593C for a load-ratio of 0.05. The results obtained from ultrasonic fatigue and conventional fatigue test are comparable. At low loading stress level, fatigue cracks are found to initiate from interior large grains. (Jiashi Miao, sponsored by AFOSR)