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The Proceedings of the Symposium on Evaluation and Diagnosis
In order to analyze the crack closure of a fatigue crack, nonlinear ultrasound is applied. In introduction of fatigue crack we develop the crack opening monitoring procedures using TOFD method to obtain the reliable result about the relation between crack opening displacement and nonlinear ultrasound. Longitudinal ultrasonic wave of 6.4MHz in frequency with large amplitude incident to the three point bending aluminum alloy and SUS316 stainless steel specimen. Angle probe transducer fabricateddoi:10.1299/jsmesed.2004.3.104 fatcat:akuillkgrfhp5cqdrfwuprxzae