Multiaxial Fatigue Life Predictions Under the Influence of Mean-Stresses

[+] Author and Article Information
Ali Fatemi

Department of Mechanical Engineering, University of Toledo, Toledo, OH 43606

Peter Kurath

Department of Mechanical and Industrial Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801

J. Eng. Mater. Technol 110(4), 380-388 (Oct 01, 1988) (9 pages) doi:10.1115/1.3226066 History: Received September 08, 1987; Online October 22, 2009


Two materials, an Inconel 718 and a 1045 steel, are used to verify the extension of a shear strain-based parameter developed to account for out-of-phase cyclic strain hardening to multiaxial mean-stresses. Shear strain amplitude on the maximum shear strain amplitude plane and the maximum stress normal to this plane are the nominal stress-strain parameters considered in this approach. Tension-torsion and axial-internal pressure loadings using tubular specimens are employed to investigate stress-strain states that exhibit mean-strains and/or mean-stresses. Deformation response relevant to the proposed fatigue damage algorithm such as mean-stress relaxation is discussed. Adequate fatigue life correlations are obtained by implementing the proposed analysis. It is also demonstrated that methodologies successful for correlating uniaxial mean-stress data often lead to erroneous multiaxial life predictions.

Copyright © 1988 by ASME
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