抄録
This paper describes a development of ultrasonic monitoring technique applied for through thickness fatigue cracks neighboring fillet weld parts. A combination of transmitted wave measurement and reflected wave measurement was found to be useful in quantitative detection of the fatigue crack.In case of 100mm separation between transmitting probe and receiving probe,our method obtains 40mm as an effective area for the quantitative detection.In other hand, small sized cracks bring about an underestimation of the cracks under small stress.Therefore, it is important for a timing optimization of data acquisition by a synchronization with ship movement.
