SEDL / STP / STP590-EB / STP33956S

Cyclic Crack Growth Analysis for Notched Structures at Elevated Temperatures

Gamble, RM
Analytical engineer, Turbodyne Corporation, Wellsville, N.Y.

Paris, PC
Presidentprofessor, Del Research CorporationBrown University, HellertownProvidence, Pa.R. I.

Pages: 23    Published: Jan 1976

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Abstract

Linear elastic fracture mechanics analysis in conjunction with the appropriate experimental crack growth data were used to predict allowable thermal fatigue crack growth rates in gas turbine disks. The crack growth predictions made for the turbine disks compared favorably with subsequent service data.

Further studies were undertaken to determine the effect of geometric stress concentration on crack initiation and crack propagation. A general method of analysis was developed to provide simple approximations of the crack growth rates for cracks initiating at notches. The crack growth rates predicted by this method are in good agreement with both experimental laboratory specimen data and field service turbine disk data.