The strain-based approach to fatigue life prediction usually relies on the conventional strain-life equation which correlates the elastic and plastic strain to the life. The correlation is based on separate log-linear curve fits of the elastic and plastic components of the strain data versus the life. It is well known, however, that these linear relationships may be valid only within a specific interval of stress or strain. When material behavior approaches elastic-perfectly plastic, for instance, it is not uncommon for the test data to deviate from linearity at both very high and very low strains. For such materials a separate fit of each curve is likely to give material constants significantly inconsistent with the fit of the cyclic stress-strain curve, especially if a good local fit over a restricted interval is obtained. In this work, some of the errors that arise as a result of this inconsistency are described, and recommended methods are developed for treating these errors. Numerical concerns are also addressed, and sample results are included.
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January 1996
Technical Papers
Overcoming Limitations of the Conventional Strain-Life Fatigue Damage Model
T. E. Langlais,
T. E. Langlais
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
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J. H. Vogel
J. H. Vogel
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
Search for other works by this author on:
T. E. Langlais
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
J. H. Vogel
Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN 55455
J. Eng. Mater. Technol. Jan 1996, 118(1): 103-108 (6 pages)
Published Online: January 1, 1996
Article history
Received:
April 13, 1994
Revised:
December 10, 1994
Online:
November 27, 2007
Citation
Langlais, T. E., and Vogel, J. H. (January 1, 1996). "Overcoming Limitations of the Conventional Strain-Life Fatigue Damage Model." ASME. J. Eng. Mater. Technol. January 1996; 118(1): 103–108. https://doi.org/10.1115/1.2805921
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