Surface acoustic wave measurements of small fatigue cracks initiated from a surface cavity

Study on Attenuation Properties of Surface Wave of AE Simulation Source Based on OPCM Sensor Element

“…Surface waves have been widely used for damage detection in many engineering structures [1][2][3]. The sensors, which receive the surface waves, play an important role in damage detection.…”

Ultrasonic wave intensity reflected from fretting fatigue cracks at bolt joints of aluminum alloy plates

“…Saka et al [9][10][11][12] also detected a vertical fatigue crack which originated at the opposite surface of the material by using various shearwave angles. Surface acoustic waves (SAWs), also have been used for detection of surface cracks and the corrosion fatigue cracks because of a simple path, independence of the plate thickness, and hence easy identification of the crack [13][14][15]. The authors [16] carried out SAW measurement with specimens containing a bolt hole to examine the detectability of signals from a bolt hole edge and a crack tip.…”

Image-based sizing of surface-breaking cracks by SH-wave array ultrasonic testing

“…The limitation on the measurable crack size was found by comparing the amplitudes of scattered wave and background noise level. Recently, Kim and Rokhlin [2] extended the method to the cracks initiated from a pit on the material surface. They showed that the pit size significantly affects the relationship between the crack size and the scattered wave amplitude.…”