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Fatigue crack growth data were obtained for an AISI 9310 (AMS 6265) steel under various conditions. The effects of stress ratio, frequency, environment, and carbon content (strength) on both the fatigue fracture topography and the fatigue crack growth rate were studied. A good correlation was obtained between the fatigue striation spacing and the macroscopic crack growth rate for crack growth rates ranging from 10−4 to 10−3 mm/cycle.
steel, fatigue crack growth, fractography, fatigue striation spacing, macroscopic crack growth rate, stress ratio effect, frequency effect, environment (humidity) effect, carbon content (strength) effect, scanning electron microscope (SEM), materials, materials science
Senior metallurgist, Sundstrand Aviation Operations, Sundstrand Corp., Rockford, Ill.
Specialist engineer, Boeing Witchita Co., Witchita, Kans.