Fatigue crack growth rate evaluation in a turbine disc after spin rig testing

This paper describes the destructive inspection analyses of cracks growing from firtree serrations of a turbine disc spun in a spin rig facility. The cracks were initiated by introducing EDM notches in predefined locations of the discs. Finite element based predictions of crack growth from these notches are also reported. ZENCRACK as well as a 2D in-house deterministic fracture mechanics software were used. Both the crack depth and the surface crack length were predicted and correlated with the results obtained during the spin rig testing. The results obtained are used in damage tolerance analyses of critical components of gas turbine engines.Peer reviewed: YesNRC publication: Ye