Details are provided for an experimental approach to study the tensile fatigue crack growth behavior of very thin metallic foils. The technique utilizes a center-notched specimen and a hemispherical bearing alignment system to minimize bending strains. To illustrate the technique, the constant amplitude fatigue crack growth behavior of a Ni-base superalloy foil was studied at temperatures from 20°C to 760°C. The constant amplitude fatigue tests were performed at a frequency of and stress ratio of 0.2. The crack growth rate versus stress intensity range data followed a Paris relation with a stress intensity range exponent between 5 and 6; this exponent is significantly higher than what is commonly observed for thicker materials and indicates very rapid fatigue crack propagation rates can occur in thin metallic foils.
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e-mail: john.holmes@ae.gatech.edu
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October 2007
Technical Papers
Experimental Technique for Elevated Temperature Mode I Fatigue Crack Growth Testing of Ni-Base Metal Foils
L. Liu,
L. Liu
Materials and Aerospace Structures Laboratory, School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
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J. W. Holmes
J. W. Holmes
Materials and Aerospace Structures Laboratory, School of Aerospace Engineering,
e-mail: john.holmes@ae.gatech.edu
Georgia Institute of Technology
, Atlanta, GA 30332-0150
Search for other works by this author on:
L. Liu
Materials and Aerospace Structures Laboratory, School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150
J. W. Holmes
Materials and Aerospace Structures Laboratory, School of Aerospace Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0150e-mail: john.holmes@ae.gatech.edu
J. Eng. Mater. Technol. Oct 2007, 129(4): 594-602 (9 pages)
Published Online: October 27, 2006
Article history
Received:
October 3, 2005
Revised:
October 27, 2006
Citation
Liu, L., and Holmes, J. W. (October 27, 2006). "Experimental Technique for Elevated Temperature Mode I Fatigue Crack Growth Testing of Ni-Base Metal Foils." ASME. J. Eng. Mater. Technol. October 2007; 129(4): 594–602. https://doi.org/10.1115/1.2772324
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