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An expression which simulates both retardation and delayed retardation in crack propagation subsequent to tensile overloading is presented and related to test data for Man Ten, Hadfield, and AISI 1020 steels, and Ti-8Al-1Mo-IV titanium alloy.
The crack growth expression is then generalized to predict the crack growth life in specimens for a variety of intermittent overload conditions. Agreement between the predicted and test data values for the four materials is within 20 percent for approximately one half of the more than 80 overload conditions studied.
fatigue (materials), retarding, predictions, crack propagation, alloys, fractures (materials)
Principal research engineer associate, Advanced Methods and Technology, Car Engineering Group, Ford Motor Company, Dearborn, Mich.
Associate professor, Oklahoma State University, Stillwater, Okla