25th Congress of International Council of the Aeronautical Sciences, 3 - 8 September 2006, Hamburg, Germany
Paper ICAS 2006-4.6.2


INVESTIGATING AND MODELING OF THE MULTI-AXIAL FATIGUE AND COMPLEX DEFORMATION OF A NI-BASED SUPERALLOY FOR IMPROVING DISC LIFING

X.- G. Yang, D.- Q. Shi, H. Schlums*, W. Rethkegel*
Beijing University of Aero. And Astro., China; *Rolls-Royce, Germany

Keywords: Constitutive Theory, Viscoplasticity, Multi-Axial Fatigue, Disk Lifing

The complex deformation and fatigue of Udimet720Li are investigated experimentally at high temperature and multiaxial loadings.The Bodner-Partom viscoplastic model is modified to improve the modeling of behaviors under asymmetric cyclic loading. A new critical-plane-based multiaxial fatigue prediction method was developed including creep damage and verified by multiaxial fatigue results.


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