An Investigation into the Effect of Normal Load Frequency on Fretting Fatigue Behavior of Al7075-T6

The disk slot and blade attachment in the gas turbine engines are operated under both cyclic axial and contact loads simultaneously. In this investigation, a new coupon scale testing apparatus is designed and manufactured to study the fretting fatigue behavior of materials under cyclic contact loads. In this cyclic contact load fretting fatigue device (CCLFFD), a simple synchronized electro-mechanical system is used for generating cyclic contact loads with frequency of 0–200 Hz and magnitude of 0–10 kN. The CCLFFD is well instrumented for adjusting, measuring and online monitoring the contact load frequency, contact load graph, and rotation speed of the servomotors. Repeatability and reliability of the test rig were examined by experiment. The performance of the CCLFFD was verified using the experimental results reported in the literature and also by conducting a number of fretting fatigue tests on Al7075-T6 at different contact load frequencies in this work. The results showed that fretting fatigue was significantly affected by the contact load frequency particularly for high cycle fatigue regime. However, the effect was less important for low cycle fatigue regime and totally insignificant for frequencies higher than 80 Hz.

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Influence of Stress Ratio and Contact Pressure on Fretting Fatigue Behavior of Modified 9Cr-1Mo Steel

Journal of Materials Engineering and Performance ◽

10.1007/s11665-021-05581-y ◽

2021 ◽

Vol 30 (4) ◽

pp. 2822-2831

Author(s):

V. Shiva ◽

Sunil Goyal ◽

N. L. Parthasarathi ◽

C. R. Das ◽

R. Kannan ◽

...

Keyword(s):

Contact Pressure ◽

Stress Ratio ◽

Fatigue Behavior ◽

Fretting Fatigue

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Influence of Wear Properties on Fretting Fatigue Life of a CK45 Alloy and the Al7175 Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.587-588.971 ◽

2008 ◽

Vol 587-588 ◽

pp. 971-975 ◽

Cited By ~ 1

Author(s):

M. Buciumeanu ◽

A.S. Miranda ◽

F.S. Silva

Keyword(s):

Wear Resistance ◽

Fatigue Life ◽

Material Properties ◽

Fatigue Behavior ◽

Synergetic Effect ◽

Fretting Fatigue ◽

Reduction Factor ◽

Strength Reduction ◽

Strength Reduction Factor ◽

Wear Properties

The main objective of this work was to study the influence of the wear properties of two commercial alloys (CK45 and Al7175) on their fretting fatigue behavior. It is verified the effect of material local degradation by wear on a fatigue strength reduction factor, namely the stress concentration factor, and on the overall fretting fatigue life of these materials. The fretting fatigue phenomenon is a synergetic effect between wear and fatigue. It is dependent on both the fatigue and the wear properties of the materials. Material properties promoting an increase in wear resistance should enhance fretting fatigue life.

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