Fatigue-creep interaction behavior of single crystal under anisothermal conditions

In this work, the crystal plastic model coupled with kinematic hardening is developed to study the creep-fatigue interaction of single crystal superalloy. And the finite element method is introduced to simulate the creep-fatigue interaction under uniform temperature and anisothermal conditions. The results show that the constitutive model with kinematic hardening can be used to study the fatigue-creep behavior of single crystal. There are obvious stress and strain gradients due to the effect of anisothermal, and the stress is redistributed at different temperature zone. Although the stress at higher temperature zone is decreasing with time, the strain at higher temperature zone is larger than that at lower temperature zone. The method can be applied in the design and analysis of the air-cooled blade and other high temperature components made of single crystal superalloys.