Finite element simulation of dual-laser source generated ultrasonic waves for detection of branched-breaking defects

Abstract A dual-laser source is used to study the propagation and scattering characteristics of ultrasound generated in the specimen containing branched-breaking defects. This propagation process between ultrasonic wave and the branched-breaking defects is analyzed in detail, when the inclination of the branched-breaking defects changes from 30° to 60° (the depth of the branched-breaking defects changes from 0 mm to 0.5 mm), the maximum amplitude of the R-wave signal spectrum gradually decreases. When the depth of the branched-breaking defects changes from 0.5 mm to 1.0 mm, the R-wave signal spectrum has no any change. The method of dual-laser source generated ultrasonic wave is used to identify and analyze the branch surface-breaking defects.