Proposal of New Biaxial Fatigue Life Prediction Parameter by Using the Effective Shear Stress for CF8M Stainless Steels

Abstract:

A combined axial-torsional low cycle fatigue test was carried out to predict the fatigue life under in-phase and out-out-phase loading conditions for CF8M cast stainless steels. The Fatemi-Socie (FS) parameter which is based on the critical plane approach is not only one of the many methods but also the best method that can predict the fatigue life under a biaxial loading condition. But the result showed that, a biaxial fatigue life prediction by using the FS parameter with several different parameters for the CF8M cast stainless steels is not conservative enough but at the same time it was the best result so far. So in this present research, we proposed a new fatigue life prediction parameter (Park-Kwon parameter) by considering effective the shear stress instead of the FS parameter which considers the maximum normal stress acting on the maximum shear strain and its effectiveness was verified.

• Periodical: Key Engineering Materials (Volumes 297-300)
• Pages: 1840-1845
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.297-300.1840
• Online since: November 2005
• Authors: Joong Cheul Park, Jae Do Kwon
• Keywords: Biaxial Fatigue, Cast Stainless Steel, Critical Plane, Degraded Material, Effective Shear Stress, In-Phase, Low Cycle Fatigue, Out-of-Phase, Thin Walled Tubular Specimen

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