Original Paper(Vol.60 No.2 pp.94-101)

Development of Inelastic Analysis for Ni Base Single Crystal Superalloy under Multiaxial Stress States

Masaki TSURUKI, Noriaki MATSUDA, Masao SAKANE, Yuji OHATA, Nobuhiro ISOBE, Akira YOSHINARI, Morio YORIKAWA and Koichi MASUNO

Abstract:This paper proposes a method of inelastic structural analysis for YH61 nickel base single crystal superalloy. Hill's anisotropic constitutive equation was applied to describe the elastic-plastic deformation of the superalloy. The equation well described the static tensile curves of the solid bar specimen with <100> and <110> axes at 1173K. The equation also well expressed the torsion curves of hollow cylinder specimens with <100> axis at 1173K. The Hillfs equation was applied to simulate the creep deformation of the superalloy. The equation gave satisfactory results for predicting the creep deformation of solid bars having <100> and <110> axes. The Hillfs equation was used to predict the creep-fatigue deformation of a cruciform specimen in biaxial loading, resulting in a good agreement with the experimental deformation.

Key Words:Nickel-base superalloy, Single crystal, Multiaxial stress, Anisotropy, Hillfs equivalent formula, FEM