Abstract
An ultrasonic technique was developed and used to observe the formation and growth of fatigue cracks in notched cylindrical specimens subjected to reversed axial cyclic loading. Fatigue curves of life-to-initial detectable cracks as well as life-to-fracture were obtained for an aluminum-, a titanium- and a cobaltbase alloy, as well as a maraging steel. Depth of initially detectable cracks ranged between approximately 0.0005 and 0.004 in. (0.013 and 0.10 mm). Curves were also obtained relating ultrasonic system output voltage to crack depth up to 0.030 in. (0.76 mm) for three materials. These curves were used to demonstrate the capability of the device for monitoring crack growth.
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