Effects of contact gap on contact properties of turbine blade tenon /mortise

Considering the impact of crystal orientation of nickel based single-crystal and contact gap, the rate-dependent crystal plasticity constitutive model was employed to calculate the contact stress and fatigue damage under the temperature gradient load and centrifugal load for turbine blade tenon/mortise complex exposure situation. The results show that contact stress of tenon/mortise mutated very obviously when the gap is less than 3.7 μm, but contact gap has less influence on the stress of tenon/mortise when gap is more than 5.4 μm. Contact stress and fatigue life are sensitive to the first tooth gap and vary greatly. The second tooth gap also has some influence on contact stress, but the impact on the fatigue life is only obvious among the smaller gap value. Crystal orientation also plays a relatively significant role on the fatigue life, showing the anisotropy of fatigue properties obviously.