A rate-dependent crystal slip finite element program was used to analyze the crack characteristic in tenon of nickel-based single crystal superalloys turbine blade

while the influence of crystallographic orientations was also taken into account. The Mises stress distributions of crack tip in tenon under isotropic condition combined with {001}

{011}

{111} crystal orientations were researched. Then the crack propagation trend was examined. The results show that: significant stress concentration and relatively large stress gradient occur in the crack tip with orientations of {001} [110]

{011} [110]

{111} [110]. The maximum stress value appears at the crack tip. Crack propagation trend varies with different crystallographic orientations. Under {001} [110]

{011} [110]

{111} [110] conditions

the crack propagation angle is 45°

54.7°

90°

respectively. It is clear that crystallographic orientation has significant influence on crack propagation trend of nickel-based single crystal superalloys turbine blade.