Abstract
Machine structure under elevated temperature generally causes not only static stress but multiaxial cyclic stress. It is common to be subjected cyclic stress simultaneously with mean stress. The purposes of this research are to obtain of the experimental data with reliability under multiaxial cyclic stresses, and to construct of the constitutive equation. It carried out a tension - torsion cyclic tests using triangular stress wave and the tension-torsion cyclic experimental result was compared with finite element analysis result on three stress conditions at 260 °C. And finite element analysis using this constructive equation was conducted to the specimen which has a notch.
