SEDL / STP / STP857-EB / STP32743S

Midrange Fatigue Crack Growth Data Correlations for Structural Alloys at Room and Cryogenic Temperatures

Tobler, RL
Fracture and Deformation Division of the National Bureau of Standards, Boulder, CO

Cheng, Y-W
Fracture and Deformation Division of the National Bureau of Standards, Boulder, CO

Pages: 23    Published: Jan 1985

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Abstract

Fatigue crack growth rate data for pure metals, structural alloys, and welds at temperatures from 295 to 4 K are selectively reviewed. The data for more than 200 material and temperature combinations are discussed in terms of the parameters C and n for the midrange of the da/dN-versus-ΔK curve. Fatigue resistance varies greatly among the different alloy classes and crystal structure types, especially at extreme cryogenic temperatures, where alternative failure mechanisms emerge. Good general correlations were achieved on the basis of Young's modulus, fracture toughness, and empirical equations relating C and n for each alloy class.