SEDL / STP / STP415-EB / STP47228S

Fatigue Crack Propagation in Structures with Simulated Rivet Forces

Figge, I. E.
Aero-space technologist, Langley Research Center, Langley Station, Hampton, Va.

Newman, J. C.
Aero-space technologist, Langley Research Center, Langley Station, Hampton, Va.

Pages: 23    Published: Jan 1967

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Abstract

Analytical and experimental studies were conducted on rates of fatigue crack propagation in sheet specimens containing either symmetric or nonsymmetric cracks subjected to uniform external loadings, simple concentrated loadings, or combinations of both. The concentrated loads simulated the rivet forces in an actual structure and were applied by a special hydraulic fixture which is described. An experimentally determined relation between the stress state near the tip of the crack and the fatigue crack propagation rate for a given material was employed to predict the crack growth for specimens subjected to simple loading conditions with good agreement. Superposition of stress-intensity factors for simple loading was used sucessfully to predict crack growth for specimens subjected to complex loadings.