Experimental and Numerical Investigation of Multiaxial Fatigue Criteria for Fatigue Life Estimation in the Hollow Cylinder of Alloy GH4169

Fatigue failure occurring in most engineering components, generally is related to multiaxial loadings. Variation in principal axes of stresses and strains in multiaxial loading causes additional hardening and this is assumed as the main reason of fatigue life decrease. The origin of multiaxiality may have diverse reasons and may arise from multiaxial loading, complicated geometry or residual stresses. In the present study various multiaxial fatigue criteria were applied for predicting fatigue life of an alloy and by using the finite element method a hollow cylindrical specimen made of alloy GH4169 was simulated under strain controlled multi-axial loading at high temperature. Hysteresis loops derived from simulation results and estimated life have been validated and compared with reference sample experimental results. The results shows that approaches considering simultaneous effect of stress, strain and additional hardening, especially at high temperature loading condition, could better predict the life. Among the presented criteria, Fatemi-Kurath, Fatemi-Socie and energy criteria have closest predictions to experimental results.