THE INFLUENCE OF SPECIMEN GEOMETRY ON NEAR THRESHOLD FATIGUE CRACK GROWTH |
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| Authors: | R. S. Vecchio J. S. Crompton R. W. Hertzberg |
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| Affiliation: | Lucius Pitkin, Inc., 50 Hudson St, New York, NY 10013, U.S.A.;Banbury Research Laboratories, Alcan Int. Ltd, Banbury, Oxon OX16 7SP, U.K.;Department of Metallurgy and Materials Engineering, Lehigh University, Bethlehem, PA 18015, U.S.A. |
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| Abstract: | Abstract— The near threshold fatigue behavior of a nickel base superalloy and a wrought 2024 aluminum alloy is examined as a function of specimen geometry. Experimental results revealed that for a given value of Δ K in Region I, crack growth rates were observed to increase as the specimen loading became more symmetric with respect to the load line. Compact tension type specimens exhibited lower crack growth rates than the more symmetrically loaded center cracked tension specimens. Consideration of the observed discrepancies is given in terms of the near field crack tip stress distribution and deformation behavior of the material affecting crack advance. |
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