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A criterion is proposed which allows estimation of the fraction of cyclic damage which would be expected from a given number of partial or complete unloadings applied during the course of a J-R curve fracture toughness test. The criterion requires both geometry and material inputs, but for the special case of a steel compact specimen, an upper-bound criterion is developed and presented graphically.
Data from a series of compact specimens of a 3% nickel alloy steel are used to verify both the model used and the resulting fractional damage criterion developed.
J-R curve testing, crack propagation, cyclic crack growth, elastic-plastic fracture
Associate professor of mechanical engineering, U.S. Naval Academy, Annapolis, MD