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Validation of a Multi-Axial Fatigue Life Prediction Using Maximum Shear Experimental Results

[+] Author Affiliations
Onome Scott-Emuakpor, Tommy George, Charles Cross

Air Force Research Laboratory, Wright-Patterson AFB, OH

John Wertz, M.-H. Herman Shen

The Ohio State University, Columbus, OH

Paper No. GT2010-22547, pp. 521-527; 7 pages
doi:10.1115/GT2010-22547
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 6: Structures and Dynamics, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4401-4 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

A multi-axial prediction method is used to calculate the fatigue life of components under pure torsion loading. The general life prediction method was developed based on the understanding that the total accumulated strain energy density in a fatigue and monotonic processes is the same. Due to this understanding, the fatigue life prediction method has been used to calculate fatigue cycles of components experiencing either uniaxial, transverse shear, or multi-axial loads. This manuscript extends the capability of the multi-axial prediction method by calculating the fatigue life of components under pure torsion loads. This calculation is possible because the maximum applied shear stress from a pure torsion load can be observed as two normal principal stresses. Based on some unusual results from experimental torsion fatigue, it was assumed that a linear misalignment was present in the experimental setup. With the inclusion of this correction, a comparison between experimental torsion fatigue results and the energy-based prediction method further affirms the capability to determine fatigue life cycles in a multi-axial loading state.

Copyright © 2010 by ASME

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