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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Development of an Improved High Cycle Fatigue Criterion

[+] Author and Article Information
Onome Scott-Emuakpor

Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210

M.-H. Herman Shen1

Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210shen.1@osu.edu

Tommy George, Charles J. Cross, Jeffrey Calcaterra

 Air Force Research Laboratory, Wright-Patterson AFB, OH 45433

1

To whom correspondence should be addressed.

J. Eng. Gas Turbines Power 129(1), 162-169 (Mar 01, 2004) (8 pages) doi:10.1115/1.2360599 History: Received October 01, 2003; Revised March 01, 2004

An integrated computational-experimental approach for prediction of total fatigue life applied to a uniaxial stress state is developed. The approach consists of the following elements: (1) development of a vibration based fatigue testing procedure to achieve low cost bending fatigue experiments and (2) development of a life prediction and estimation implementation scheme for calculating effective fatigue cycles. A series of fully reversed bending fatigue tests were carried out using a vibration-based testing procedure to investigate the effects of bending stress on fatigue limit. The results indicate that the fatigue limit for 6061-T6 aluminum is approximately 20% higher than the respective limit in fully reversed tension-compression (axial). To validate the experimental observations and further evaluate the possibility of prediction of fatigue life, an improved high cycle fatigue criterion has been developed, which allows one to systematically determine the fatigue life based on the amount of energy loss per fatigue cycle. A comparison between the prediction and the experimental results was conducted and shows that the criterion is capable of providing accurate fatigue life prediction.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Dimensions (cm) of the ASTM fatigue dog-bone specimen

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Figure 2

MTS clamping and measurement devices

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Figure 3

S-N data tension/compression

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Figure 4

Bending fatigue specimen

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Figure 5

Vibration-based fatigue experiment setup

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Figure 6

FEM two-stripe mode shape of the plate specimen

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Figure 7

Laser-strain gage correlation

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Figure 8

S-N data: bending

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Figure 9

S-N curve: tension/compression, in linear-log scale

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Figure 10

S-N curves: tension/compression, bending

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Figure 11

Stress distributions of axial and bending

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Figure 12

Cyclic stress-strain experimental data for aluminum 6061-T6

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Figure 13

Monotonic stress-strain experimental data for aluminum 6061-T6

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Figure 14

Monotonic true stress-strain experimental data for aluminum 6061-T6

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Figure 15

Monotonic true stress-strain test data and strain equation approximation for aluminum 6061-T6

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Figure 16

Cyclic peak-to-peak stress-strain experimental data for aluminum 6061-T6

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Figure 17

Tension/compression fatigue comparison

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Figure 18

Tension/compression fatigue comparison

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